246 results about "Dielectric ceramics" patented technology

The present invention belongs to the technical field of microwave dielectric ceramics, and discloses a reducing-resistant microwave dielectric ceramic temperature-frequency characteristic regulator. Among them, the application of a microwave dielectric ceramic material as a microwave dielectric ceramic temperature-frequency characteristic regulator, and the chemical formula of the microwave dielectric ceramic material satisfies (AO)3(BO)(XO2)2, where A = Ba x Sr y , B = Mn h Mg k , X = Si m Ti n ; x + y = 1, h + k = 1, m + n = 1, 0 ≤ x ≤ 1, 0.6 ≤ h ≤ 1, 0.8 ≤ m ≤ 1; and when h = 1 and m = 1, x ≠ 0; this microwave dielectric ceramic material can be adjusted by addition to regulate the overall temperature coefficient of resonance frequency of the ceramic system. By improving the composition of the material, the obtained microwave dielectric ceramic material has the characteristics of adjustable dielectric constant, low dielectric loss, and high positive temperature coefficient of resonance frequency, and can especially be used as a microwave dielectric ceramic temperature-frequency characteristic regulator with a strong regulation effect.

The invention relates to the technical field of dielectric ceramics, and provides a gadolinium-tantalum co-doped strontium titanate-based giant dielectric ceramic material and a preparation method thereof. The gadolinium-tantalum co-doped strontium titanate-based giant dielectric ceramic material is obtained by co-doping a strontium titanate material with gadolinium and tantalum and sintering under a nitrogen condition. The gadolinium-tantalum co-doped strontium titanate-based giant dielectric ceramic material prepared by the method is stable in structure, grains are refined and grow more compactly through nitrogen atmosphere sintering, the types of defect structures in the material are richer through a double-element doping and atmosphere sintering process, and the dielectric property of the strontium titanate-based giant dielectric ceramic material is improved. The result of the embodiment shows that when x is equal to 0.015, the dielectric constant of the gadolinium-tantalum co-doped strontium titanate-based giant dielectric ceramic material is 320926 and the dielectric loss is 0.1119 at the room temperature and the test frequency of 1kHz.

The invention provides a high-dielectric low-loss ceramic composition as well as a preparation method and application thereof, and relates to the technical field of functional ceramic materials, the high-dielectric low-loss ceramic composition comprises a perovskite type compound serving as a main component and an auxiliary component; wherein the perovskite type compound contains a Ba element and a Ti element, and the auxiliary components comprise a first auxiliary component containing an Mg element, a second auxiliary component containing an Nb element, a third auxiliary component containing an Mn element, a fourth auxiliary component containing a rare earth element R, and a fifth auxiliary component containing SiO2. According to the present invention, the ratio of the main components to the auxiliary components is subjected to design optimization, the ratio of the Nb element in the second auxiliary component to the Mn element in the third auxiliary component is adjusted, and the material preparation process parameters are subjected to optimization control, such that the dielectric constant and the temperature stability of the dielectric ceramic material are improved, and the dielectric loss is reduced.

The invention discloses an Mg + Nb co-doped TiO2 giant dielectric ceramic material and a preparation method thereof, and relates to the technical field of giant dielectric materials. The (Mg + Nb) co-doped TiO2 ceramic is successfully prepared by adopting a traditional solid phase method, the performance of the TiO2-based giant dielectric ceramic is regulated and controlled through a new doping strategy, the raw material is single, the preparation process is simple, the cost is low, the repeatability is good, the yield is high, the obtained ceramic material has giant dielectric performance, and the preparation method is suitable for industrial production. The (Mg + Nb) co-doped TiO2 novel giant dielectric ceramic can meet the requirements of a dielectric material with high dielectric constant, low dielectric loss and good temperature and frequency stability, and compared with other widely applied giant dielectric materials, the titanium dioxide-based giant dielectric ceramic has the characteristics of simplicity in preparation and excellent dielectric property.

The invention relates to the technical field of dielectric ceramic powder preparation processes, in particular to a multilayer ceramic capacitor, high-activity nano barium titanate powder for the multilayer ceramic capacitor and a preparation method of the high-activity nano barium titanate powder, and the method comprises the following steps: (1) reacting soluble barium salt with a precipitator to obtain barium carbonate precursor particles with high specific surface area; (2) uniformly coating the surfaces of the barium carbonate precursor particles with nano titanium dioxide particles by using a supercritical fluid flash evaporation technology to form a composite precursor; and (3) carrying out solid-phase synthesis reaction on the composite precursor, and sintering to obtain the nano barium titanate powder. Through the synergistic effect of two means of high-activity precursor preparation and nanoscale uniform coating, the composite precursor with extremely high specific surface area, surface energy and microcosmic uniformity is prepared, the thermal sintering temperature is effectively reduced, abnormal growth of crystal grains and lattice distortion are restrained, and the preparation method has the advantages that the preparation process is simple, and the preparation cost is low. The tetragonality of the nano barium titanate powder is obviously improved.

The present application relates to the technical field of dielectric ceramic powder preparation, and particularly relates to a multilayer ceramic capacitor, a high-activity nano-barium titanate powder for the multilayer ceramic capacitor and a preparation method of the high-activity nano-barium titanate powder, the method comprising the following steps: (1) reacting a soluble barium salt with a precipitator to obtain barium carbonate precursor particles with high specific surface area; (2) uniformly coating nano-titanium dioxide particles on the surface of the barium carbonate precursor particles by using a supercritical fluid flash technology to form a composite precursor; and (3) performing a solid-phase synthesis reaction on the composite precursor and sintering to obtain nano-barium titanate powder. The present application, through the synergistic effect of the two means of "high-activity precursor preparation" and "nano-level uniform coating", prepares a composite precursor with extremely high specific surface area, surface energy and micro-uniformity, effectively reduces the heat sintering temperature, suppresses abnormal grain growth and lattice distortion, and significantly improves the tetragonality of the nano-barium titanate powder.

The invention discloses a preparation method of high-capacity X7R type barium titanate-based dielectric ceramic powder, and relates to the field of preparation of barium titanate-based electronic materials, and the preparation method comprises the following steps: pre-synthesizing a rare earth-transition metal composite dopant by adopting a sol-gel method; mixing the obtained rare earth-transition metal composite dopant with a 100-250 nm solid-phase nano barium titanate main material, and adding a glass phase sintering aid; a staged pre-sintering process is adopted; ball-milling the pre-sintered powder by a high-energy ball mill, and sintering in a microwave-assisted atmosphere sintering furnace by adopting a microwave-assisted atmosphere sintering process; according to the design of the composite dopant, atomic-scale uniform doping of rare earth and transition metal is achieved through a sol-gel method, and the problem of component segregation caused by traditional mechanical mixing is solved; a staged pre-sintering process is adopted and is different from traditional single-stage pre-sintering, organic matters are removed in a low-temperature stage to avoid carbon residues, and the grain size is accurately controlled in a high-temperature stage; a contrast experiment shows that the dielectric constant is increased by 15%.

The invention discloses a composite solid electrolyte membrane, a preparation method thereof and a lithium ion solid-state battery, and belongs to the technical field of batteries. The composite solid electrolyte membrane comprises inorganic fibers, lithium salt and a polymer film-forming matrix. The inorganic fiber comprises a dielectric ceramic fiber and an inorganic ion conductive fiber which are formed by side-by-side electrostatic spinning. Under an external electric field, a built-in electric field can be generated between the dielectric ceramic fiber and the inorganic ion conductive fiber which are formed by side-by-side electrostatic spinning, a space charge layer between the organic polymer solid electrolyte and the inorganic ion conductive material in the composite solid electrolyte membrane can be weakened, and the lithium flux is optimized, so that dissociation of lithium ions is promoted; the composite solid electrolyte membrane can generate more lithium ions easy to move, so that the lithium ions in the lithium salt can spontaneously transfer to the inorganic ion conductive material in a cross-interface manner, thereby realizing high-efficiency transmission of the lithium ions and further improving the ionic conductivity of the composite solid electrolyte membrane.

The invention relates to the technical field of microwave ferrite devices, and discloses a miniaturized broadband microstrip circulator based on a double-ferrite nested structure, comprising a substrate, the upper surface of which is provided with a magnetic conductive sheet; a high dielectric ceramic is arranged on the magnetic conductive sheet, and a low magnetic saturation ferrite and a high magnetic saturation ferrite are sequentially nested in an inner cavity of the high dielectric ceramic; a circuit is arranged on the upper surface of the high-dielectric ceramic, and a ceramic piece and a permanent magnet are sequentially installed above the circuit. According to the circulator, a magnetic conductive sheet is additionally arranged, a structure with high dielectric ceramics as a core is constructed, the characteristic difference of two ferrite gyromagnetic materials with different magnetic saturation intensities is utilized, and the frequency resonance characteristic of a center junction is adjusted through nested arrangement, so that gyromagnetic effects under different frequencies are complementary to expand the working frequency band. Meanwhile, the high-dielectric ceramic optimizes port impedance matching and reduces electromagnetic wave reflection by virtue of a high dielectric constant, and cooperates with an internal ferrite nested structure, so that the frequency bandwidth is widened through a composite material mode, and miniaturization and broadband effects are achieved.

A method for manufacturing a multi-layer ceramic capacitor (MLCC) end electrode and printing a full-area inner electrode protective layer is disclosed. The method uses thin dielectric ceramic layer thickness and a plurality of nickel inner electrode stacks to achieve high capacitance. The method produces high-density electrode-to-ceramic ratio end edges and side edges. The method uses an ultralow-temperature electrochemical deposition coating technology to manufacture a low-stress multi-layer ceramic capacitor end electrode and an insulating protective layer, thereby improving the yield of the multi-layer ceramic capacitor and reducing manufacturing costs.

The invention discloses an electrostatic chuck, and belongs to the technical field of semiconductors, and the electrostatic chuck comprises a ceramic substrate which comprises a main adsorption surface used for adsorbing a wafer; the adsorption electrode is embedded in the ceramic substrate, the adsorption electrode comprises a metal conductive material and other materials used for generating a liquid phase to promote sintering, and the addition amount of the other materials is 0.2 wt%-1.5 wt% relative to the addition amount of the metal conductive material; the average grain size of the other materials is smaller than the average grain size of the ceramic substrate. In the application, the average grain size of other materials is set to be smaller than the average grain size of the ceramic substrate, so that the grain sizes of the adsorption electrode are different, on one hand, the conductivity of the adsorption electrode is not influenced, and on the other hand, the adhesion between the adsorption electrode and the dielectric ceramic can be obviously improved; the problem of poor adhesion between the adsorption electrode and the dielectric layer of the high-purity alumina electrostatic ceramic disc can be effectively improved.

To provide an additive for producing dielectric ceramics which can easily realize a state of atomized powder, has low hygroscopicity, and can realize high density of dielectric ceramics.SOLUTION: An additive for producing dielectric ceramics is a composite powder comprising an alkaline earth metal element A and boron, and in the composite powder, the molar amount a of the alkaline earth metal element A and the molar amount b of the boron satisfy the following formula (1). The composite powder satisfies at least one condition selected from the group consisting of the following condition (i) and the following condition (ii). (i) The composite powder includes an amorphous phase. (ii) The composite powder includes two or more crystal phases.SELECTED DRAWING: Figure 4

A dielectric ceramic composition includes main phase grains and a grain boundary between the main phase grains. The main phase grains include a perovskite compound as a main component. The perovskite compound includes at least Ca and Sr as A-site elements and at least Zr and Ti as B-site elements. The dielectric ceramic composition further includes an oxide of at least one additional element. β / α is 3.0 or more and 6.0 or less, where α (unit: parts by mol) denotes a content of the at least one additional element of the dielectric ceramic composition with respect to 100 parts by mol B-site elements, and β (unit: parts by mol) denotes a content of the at least one additional element of the grain boundary with respect to 100 parts by mol B-site elements.

The present disclosure provides a dielectric paste composition, a dielectric ceramic sheet, and a method of manufacturing a multilayer electronic component. The dielectric slurry composition comprises dielectric particles, a solvent, a dispersant and an adhesive, the dielectric particles comprise BaTiO3, the solvent comprises ethanol and toluene, the dispersant comprises polyvinylpyrrolidone, and the mass ratio of the ethanol to the toluene is greater than 1.0 and less than 2.3.

This application provides a temperature-stable low-dielectric silicate LTCC material and its preparation method, relating to the field of low-dielectric microwave dielectric ceramics technology. The low-dielectric silicate LTCC material has the following chemical formula: x Na2O- y CaO- z SiO2- m CaSnSiO5- n The compound of B2O3 was prepared, wherein 0.8 ≤ x ≤1.2, 1.8≤ y ≤2.2, 2.9≤ z ≤3.3, 0.6≤ m ≤1.5, 0.03≤ n The dielectric constant is ≤0.1; the chemical formula of its main crystalline phase is Na2Ca2Si3O9. The temperature-stable low-dielectric silicate LTCC material prepared using the above method overcomes the defect of poor temperature stability in the synthesis of low-dielectric microwave dielectric ceramics in existing technologies. The prepared low-dielectric silicate LTCC material has the characteristics of low dielectric constant, temperature stability, and a sintering temperature below 950℃. It has the advantages of simple synthesis process, stable main crystalline phase composition, and low raw material price, making it a suitable low-dielectric LTCC material for millimeter-wave communication.

To provide a multilayer ceramic electronic component capable of improving bias characteristics while maintaining ferroelectricity.SOLUTION: A multilayer ceramic electronic component includes: a dielectric layer that has barium titanate as a main component, and has a core portion and a shell portion covering the core portion, in which calcium is solid dissolved in the shell portion, and includes a plurality of crystal grains in which a calcium concentration in the shell portion is 10 times or more a calcium concentration in the core portion; an internal electrode that is provided with the dielectric layer interposed therebetween, and has nickel or copper as a main component; and an external electrode that is electrically connected to the internal electrode.SELECTED DRAWING: Figure 1

Provided is a multilayer ceramic capacitor 1 comprising a layered body 10 including a dielectric ceramic layer 20 and internal electrode layers (21, 22) layered in a layering direction T, wherein: the layered body 10 has a substantially rectangular parallelepiped shape having a first main surface 11 and a second main surface 12 that face each other in a layering direction T, a first side surface 13 and a second side surface 14 that face each other in a width direction W orthogonal to the layering direction T, and a first end surface 15 and a second end surface 16 that face each other in a length direction L orthogonal to the layering direction T and the width direction W; a WT cross section that is a cross section of the layered body 10 taken along the width direction W and the layering direction T has Ni non-segregation parts (41, 43) that are present in a region at a prescribed thickness from at least one surface of the layered body 10 toward the interior of the layered body 10, and Ni segregation parts (42, 44) that are present farther into the layered body than the Ni non-segregation parts (41, 43) and contain Ni segregated in the dielectric ceramic layer 20; and a boundary (d) between the Ni non-segregation parts (41, 43) and the Ni segregation parts (42, 44) is positioned in a region of 5-20 μm from the surface of the layered body 10 toward the interior of the layered body 10.

A multilayer ceramic capacitor includes dielectric ceramic layers and inner electrode layers. The dielectric ceramic layers include crystal grains including a perovskite oxide including at least one A-site element and at least one B-site element. When a cross-section of the dielectric ceramic layers is observed using a scanning transmission electron microscope, the dielectric ceramic layers include grains, on which a plane of a perovskite structure is observed, as crystal grains. The grains, when subjected to compositional analysis by energy dispersive x-ray spectroscopy, have an atom-distributed region in which a concentration of the A-site element or B-site element (c) subtracted from a maximum concentration of the element (cmax) (Δc=cmax−c) is about 2 atm % or less, at one or more atomic sites in the grains, and an area of the atom-distributed region (SΔc≤2%) is about 0.050 nm2 or less.

The present invention discloses a method for preparing ultrafine particles of low-dielectric ceramic materials for 6G, relates to the technical field of dielectric ceramic materials, and belongs to patent classification number C04B35 / 00. The specific preparation method is to first prepare a sol using tetraethyl orthosilicate, calcium nitrate, magnesium nitrate, aluminum isopropylate, zirconium oxychloride and lithium nitrate, heat the sol and let it stand for gelation, then use supercritical CO2 to dry, obtain aerogel, heat and reduce calcination to obtain (Ca, Mg) SiO3-ZrO2 nanopowder, and use atomic layer deposition technology to coat a TiO2 layer on the surface of the nanopowder to obtain ultrafine particles of dielectric ceramic materials. The ceramic particles prepared by the present invention not only have a low dielectric constant, but also have a smaller particle size and a higher density under low-temperature sintering.

The invention provides a laminated ceramic capacitor with excellent reliability. The multilayer ceramic capacitor includes: a body portion including a plurality of dielectric ceramic layers and a plurality of internal electrode layers stacked in the thickness direction, the body portion including a first main surface and a second main surface facing each other in the thickness direction, a first side surface and a second side surface facing each other in the width direction, and a first end surface and a second end surface facing each other in the length direction; and a pair of external electrodes provided on the first end surface and the second end surface, respectively, and electrically connected to the plurality of internal electrode layers. The dielectric ceramic layer contains, as a main component, crystal grains comprising a perovskite-type composite oxide containing barium (Ba) and titanium (Ti), and further contains a rare earth element (Re). In a cross section including the thickness direction, the dielectric ceramic layer includes a rare earth high-concentration region in which the molar ratio (Re / Ti ratio) of a rare earth element (Re) to titanium (Ti) is 0.04-0.30 in an area ratio of 50% or more, and in the cross section, the CV value of the line segment ratio in the thickness direction of the rare earth high-concentration region is 25% or less.

The application relates to the technical field of ceramic materials, in particular to a high-temperature impedance X7R dielectric ceramic material and a preparation method and application thereof, raw materials of the high-temperature impedance X7R dielectric ceramic material include main powder, a dopant, a dispersing agent and a binder, the main powder is prepared by ball milling, pre-sintering BaTiO3, Na 0.5 Bi 0.5 TiO3 at a molar ratio of 9:1, the pre-sintering temperature is 1200-1400 DEG C, and the pre-sintering time is 2-4 h; the dopant is obtained by pre-sintering Nb2O5, a transition metal oxide MeO and MgCO3, the pre-sintering temperature is 650-750 DEG C, and the pre-sintering time is 1-2 h; in terms of molar parts, the main powder is 100 molar parts, the Nb2O5 is 0.1-1.0 molar parts, the MgCO3 is 0.1-1.0 molar parts, and the transition metal oxide MeO is 0.1-3.0 molar parts. The temperature characteristic of the dielectric ceramic is improved, and the temperature stability meets the X7R dielectric material standard formulated by the American Electronics Association.

The present invention relates to a low-dielectric and low-loss magnesium silicate system microwave dielectric ceramic and a low-temperature preparation method thereof. The present invention uses Mg2SiO4 ceramic as a matrix and adopts Mg 2+ Mg was synthesized by the conventional solid phase reaction method using non-stoichiometric modification, CaTiO3 to adjust the temperature stability and LiF to reduce the sintering temperature. 2.1 SiO 4.1 ‑xCaTiO3‑yLiF multiphase composite microwave dielectric ceramics, wherein x=0.09~0.13,y=0.05~0.25. The multiphase composite makes the prepared Mg 2.1 SiO 4.1 ‑xCaTiO3‑yLiF has a low dielectric constant, low dielectric loss, and a near-zero resonant frequency temperature coefficient, and reduces the sintering temperature of ceramic samples. This invention could provide an alternative material for the preparation of high-frequency communication components using LTCC technology, and has broad application prospects.

This application discloses a perovskite-structured high-entropy ceramic material with excellent dielectric temperature stability. The chemical formula of the high-entropy ceramic material is (Ca... 0.2 Sr 0.2 Ba 0.2 Mg 0.2 Bi 0.1 Na 0.1 (Ti1) x Zr x O3, x=0.05~0.2. This application employs an A-site high-entropy material composition design that enables elements to break through the solid solution limit, achieving greater solid solubility in the material system. By using Zr 2+ Ti at the B site in ion-substituted ceramics 2+ The composition design approach successfully achieved B-site ion doping, resulting in well-grown, dense grains within the ceramic. The sample microstructure exhibited few pores, with elements uniformly distributed throughout the ceramic without agglomeration. By optimizing and controlling the ceramic's microstructure, the dielectric ceramic obtained in this application possesses a high dielectric constant and excellent temperature stability, with capacitance-temperature variations meeting both X7R and X6R capacitor standards.

A dielectric ceramic composition and a multilayer ceramic capacitor including the same are provided, the dielectric ceramic composition includes a BaTiO3-based base material main component and a subcomponent, wherein the subcomponent includes zinc oxide (ZnO) as a first subcomponent, and the content of the ZnO is 0.1 mol % or more and less than 0.4 mol % with respect to 100 mol % of the base material main component.

The application discloses a multilayer chip ceramic capacitor and a preparation method thereof, and relates to the technical field of ceramic capacitors. The multilayer chip ceramic capacitor comprises a silicon substrate layer, a dielectric ceramic layer, an internal electrode layer and an end electrode. The end electrode is arranged above the silicon substrate layer, and the internal electrode layer is arranged below the end electrode. The dielectric ceramic layer is arranged between the internal electrode layers. The dielectric ceramic layer is made of a nano-level barium titanate plate, and the barium titanate plate is doped with lanthanum oxide, strontium oxide and calcium oxide. The internal electrode layer is made of nickel particles and coated with rare earth oxides to reduce oxidation. The end electrode comprises a first corrosion-resistant layer, a second corrosion-resistant layer and a third corrosion-resistant layer. The third corrosion-resistant layer is fixedly connected to the top end of the silicon substrate layer. The second corrosion-resistant layer is arranged at the top end of the first corrosion-resistant layer. The third corrosion-resistant layer is arranged at the top end of the second corrosion-resistant layer. The end electrode can prevent metal migration during long-term use, and the contact effect is improved.

The utility model relates to the related technical field of dielectric ceramics, in particular to a dielectric ceramic powder raw material grinding device. Comprising a base plate, a grinding mechanism is installed at the upper end of the base plate, a collecting mechanism is arranged in the grinding mechanism, the grinding mechanism comprises a support, a grinding barrel, a transmission rod, a gear box, a motor, a mounting plate, a rotating shaft, a bearing, a grinding roller, a discharging plate, a flow dividing strip, a flow dividing block, a grinding rail and a feeding opening, and the rotating grinding roller moves in the grinding rail; according to the double-layer coarse grinding machine, materials are ground, the double-layer arrangement enables the materials to be subjected to coarse grinding and fine grinding for the second time after coarse grinding for the first time, the double-layer arrangement allows the materials to be subjected to coarse grinding and fine grinding, the grinding effect and efficiency are improved, the materials can be dispersed through a discharging plate, a flow dividing strip, a flow dividing block, a grinding rail and a feeding opening, the materials enter from the feeding opening, and therefore the materials can be evenly ground. And then the materials fall to the upper end of the flow dividing block and are distributed to the upper end of the discharging plate, the rotating discharging plate disperses the materials through centrifugal force, and the materials at the upper end of the discharging plate are discharged.

This multilayer ceramic capacitor 1 is provided with: an element body 10 including a plurality of dielectric ceramic layers 20 and a plurality of internal electrode layers 30 stacked in a thickness direction T; and external electrodes 11, 12 provided on the surface of the element body 10, the external electrodes 11, 12 being electrically connected to the internal electrode layers 30. The dielectric ceramic layer 20 contains a perovskite type oxide as a main component. The perovskite type oxide contains at least one of barium (Ba), calcium (Ca), and strontium (Sr), at least one of titanium (Ti) and zirconium (Zr), and at least one of rare earth elements (Re). For a Re / (Ti+Zr) ratio of each pixel of an element mapping image converted to atom%, obtainable by STEM-EDS analysis (scanning transmission electron microscope-energy dispersive X-ray spectroscopic analysis) of the dielectric ceramic layer 20, if the range of 0≤Re / (Ti+Zr)˂2 is divided by a section width 0.002, the number of pixels belonging to each section is enumerated, and the frequency of the number of pixels is converted to a relative frequency so that the cumulative frequency of 0≤Re / (Ti+Zr)˂2 becomes 1, then: the arithmetic mean of the Re / (Ti+Zr) ratio in the dielectric ceramic layer (hereinafter referred to as a "concentration ratio arithmetic mean") is 0.03 to 0.10 inclusive; a value obtained by dividing a starting point of a section in which the cumulative frequency exceeds 0.1 for the first time, starting from the relative frequency of a first section 0≤Re / (Ti+Zr)˂0.002, by the concentration ratio arithmetic mean (hereinafter referred to as a "10% cumulative frequency ratio to the concentration ratio arithmetic mean") is 0.50 or more; and a value obtained by dividing a starting point of a section in which the cumulative frequency exceeds 0.9 for the first time, starting from the relative frequency of the first section 0≤Re / (Ti+Zr)˂0.002, by the concentration ratio arithmetic mean (hereinafter referred to as a "90% cumulative frequency ratio to the concentration ratio arithmetic mean") is 1.30 or less.

A dielectric ceramic composition includes main phase grains and a grain boundary. The main phase grains include a perovskite compound as a main component. The perovskite compound includes at least Ca, Sr, Zr, and Ti. The dielectric ceramic composition further includes an oxide of at least one additional element. The dielectric ceramic composition has a total content of Ti, Mn, and Cr of 7.0 parts by mol or less. The main phase grains include a specific main phase grain. The specific main phase grain includes a first minute region having a high total content of Mn and Cr and a second minute region having a low total content of Mn and Cr. The first minute region is located in a peripheral portion of the specific main phase grain. The second minute region is located in a central portion of the specific main phase grain.

The invention discloses a high-voltage strontium titanate ceramic material and application thereof, and belongs to the technical field of lead-free dielectric ceramic materials. The chemical general formula of the high-voltage strontium titanate ceramic material is (SrmAnBnCqDs) (TixEyFy) O3, wherein m + 2n + q + s = 1, m, n, q, sgt; 0, x + 2y = 1, xgt; 0, 0 < y < = 0.2; the element A and the element B form an A-B heterovalent element pair, the sum of element valence states of the A-B heterovalent element pair is 4, and at least one A-B heterovalent element pair is arranged; the element C and the element D are not element pairs, the valence states of the elements are positive bivalent, and the element A, the element B, the element C and the element D are different in composition elements; the element E and the element F form an EF hetero-valent element pair, the sum of element valence states of the EF hetero-valent element pair is 8, and at least one EF hetero-valent element pair is arranged. The breakdown voltage and capacitance of the high-voltage ceramic capacitor can be improved while the miniaturization of the high-voltage ceramic capacitor is maintained.

The present invention belongs to the technical field of electronic materials, specifically a Mg-Ti-O-based high-Q high thermal conductivity microwave dielectric ceramic material and a preparation method thereof. The ceramic material of the present invention adopts a solid-phase reaction method, and generates a subcrystalline phase MgTiO3 with a high Q value and a high thermal conductivity by doping Mg2TiO4 with TiO2. The microstructure and density of the overall material are improved by the composite ceramic system, thereby improving the thermal conductivity and Q×f value of the ceramic material; the (1-y)Mg2TiO4+yMgTiO3 ceramic material prepared by the present invention, 0<y<0.5, has a thermal conductivity of 8.0~10.5W / (m·K), a Q×f value of 100000~150000GHz, and a relative dielectric constant of 14~16. The Mg-Ti-O-based high-Q high thermal conductivity microwave dielectric ceramic material of the present invention has a simple preparation process, high thermal conductivity and Q×f value and an appropriate dielectric constant, and can be used as a multilayer ceramic component material and a circuit substrate material in the field of electronic packaging.