39 results about "Curie" patented technology

The invention relates to a flame detector based on a high curie point relaxor ferroelectric single crystal. The flame detector comprises a shell, a bottom plate, a shell cover, a PCB group, a main control module and an infrared sensor, the bottom plate and the shell cover are installed at the two ends of the shell respectively, the PCB set is arranged in the shell and is of a multi-layer structure, the main control module and the infrared sensor are connected with each other and are fixed to the PCB set respectively, and the optical lens is installed on the shell cover; the infrared sensor is a relaxor ferroelectric single crystal pyroelectric sensor, the chemical composition of the relaxor ferroelectric single crystal of the infrared sensor is (1-x-y) Pb (In1 / 2Nb1 / 2) O < 3-y > Pb (Mg1 / 3Nb2 / 3) O < 3-x > bTiO < 3-z > Mn, x is equal to 0.20-0.40, y is equal to 0.18-0.60, and z is equal to 0.003-0.03. Compared with the prior art, the system has the advantages of high anti-interference capability, long detection distance and the like.

The invention belongs to the technical field of electrochemistry, and particularly relates to a method for strengthening electrolytic reaction efficiency through a programmable temperature gradient thermomagnetic effect. Specifically, a catalytic electrode comprising a plurality of Curie point materials which are arranged in a stacked manner is constructed, and when the catalytic electrode is heated to a corresponding temperature interval, each layer of material can sequentially show different magnetic properties, so that the reaction process is influenced. The Curie point characteristic of the material is utilized, continuously changing temperature fields are generated in different areas, and specific chemical reactions are selectively activated or inhibited in cooperation with magnetic field switching. The preparation method has the technical advantages that the electrolytic active membrane can be constructed on a plurality of micron-sized-thickness membrane electrode materials with different substrates, the catalytic activity of the membrane electrode material can be adjusted along with the temperature, and the membrane electrode material can be widely applied to the technical fields of electro-catalytic water decomposition, electrodialysis, electro-adsorption and the like.

Disclosed herein are ceramic materials, such as bismuth substituted garnets, which can have high curie temperatures and high dielectric constants. In certain implementations, indium can be incorporated into the ceramic to improve certain properties and to avoid calcium compensation. The ceramic materials disclosed herein can be particular advantageous for below resonance applications.

This invention discloses a high Curie temperature, high frequency, and high impedance manganese-zinc ferrite material and its preparation method, belonging to the technical field of soft magnetic ferrite materials. The manganese-zinc ferrite material consists of a main component and secondary components. The main component, calculated as oxides, comprises Fe2O3: 48.5–49.9 mol%, ZnO: 18.5–21.5 mol%, NiO: 0.5–2.0 mol%, with the remainder being MnO. The secondary components, by weight of the main component, include at least four of the following: Co2O3: 0.05–0.30 wt%, SiO2: 0.005–0.01 wt%, CaCO3: 0.02–0.05 wt%, ZrO2: 0.01–0.02 wt%, Bi2O3: 0.01–0.03 wt%, and V2O5: 0.01–0.05 wt%, mixed in any proportion. The resulting manganese-zinc ferrite material exhibits excellent properties such as high impedance.

There is described an aerosol-forming substrate for use in combination with an inductive heating device. The aerosol-forming substrate comprises a solid material which is capable of releasing volatile compounds that can form an aerosol upon heating of the aerosol-forming substrate and at least a first susceptor material for heating the aerosol-forming substrate. The at least first susceptor material is arranged in thermal proximity of the solid material. The aerosol-forming substrate further comprises at least a second susceptor material which has a second Curie-temperature which is lower than a first Curie-temperature of the first susceptor material. The second Curie-temperature of the second susceptor material corresponds to a predefined maximum heating temperature of the first susceptor material. There is also described an aerosol-delivery system.

The application relates to a preparation method of a high-dielectric high-Curie-temperature garnet ferrite without rare earth, which comprises the following steps: pre-treating raw materials to make the raw materials with different particle sizes basically reach the same particle size state, and then obtaining mixed materials with uniform components through mechanical stirring and one-time granulation, so that ideal pre-sintering effect can be realized. Meanwhile, three kinds of second grinding materials with different pre-sintering temperatures and particle sizes are uniformly mixed to control the sintering activity of the powder, and the sintering process is matched, so that the microstructure of the sintered body can be finally improved, the porosity of the ferrite material is reduced, and the ferromagnetic resonance line width is reduced. Through the combined substitution of bismuth, zirconium and calcium elements and the adjustment of the preparation process, the particle size of the powder is adjusted, the sintering stage is controlled to the end of continuous grain growth, the microstructure of the garnet ferrite material is improved, and finally the ferrite material with high dielectric constant, high saturation magnetization, low ferromagnetic resonance line width and high Curie temperature is prepared.

The application provides high-curie-temperature low-resistance lead-free thermosensitive ceramic and a preparation method thereof, and belongs to the technical field of electronic ceramic elements. 1‑x‑y La x (Bi 0.5 Na 0.5 ) y )(Ti 0.9996 Mn 0.0004 )O3; wherein the value range of x is 0.001<=x<=0.004, and the value range of y is 0.001<=y<=0.0075. The preparation method comprises the following steps: mixing (Bi 0.5 Na 0.5 )TiO3 powder synthesized by two-stage heating hydrothermal method, (Ba 1‑x La x )TiO3 powder synthesized by solid-phase reaction method, Mn(NO3)2 aqueous solution and sintering auxiliary agent AST powder, then performing granulation, molding, glue removal and sintering. The barium titanate-based thermosensitive ceramic prepared by the method has extremely low room temperature resistivity and relatively high curie temperature.

The present disclosure relates to a method for obtaining lead-free piezoelectric materials, including: Step S100, adjusting the T / O phase boundary of a first lead-free piezoelectric material: for the first lead-free piezoelectric material, adjusting the T / O phase boundary between the tetragonal phase T and the orthorhombic phase O to be near the room temperature by doping; Step S200, further adjusting the C / T phase boundary and the O / R phase boundary: further adjusting the C / T phase boundary between the cubic paraelectric phase C and the tetragonal phase T, and the O / R phase boundary between the orthorhombic phase O and the rhombohedral phase R by doping, so as to enable the C / T phase boundary and the O / R phase boundary to approach the T / O phase boundary; and Step S300, obtaining second lead-free piezoelectric materials: obtaining multiple second lead-free piezoelectric materials with different piezoelectric constants d33 and different Curie temperatures TC in the process.

The present invention provides a sintered body having a high Curie point and exhibiting high magnetic permeability in a high frequency region. The sintered body comprises a spinel-type ferrite oxide having a main component of a metal element being Fe, Ni, Cu, and Zn, and further comprises Zr, Mn, Al, Co, and Cr, and when the molar fractions of Zn, Ni, Cu, Zr, Mn, Al, Co, and Cr, with Fe being 100 mol, are respectively set as a, b, c, d, e, f, g, and h, 100-a-b-c+2d+(1 / 2)e, a+b+c+d+e / 2, f, g, and h respectively satisfy the following formulas (1) to (5). 49.0 < 100-a-b-c+2d+(1 / 2)e < 50.0 (1) 50.2 < a+b+c+d+e / 2 < 52.7 (2) 0.0012 ≤ f ≤ 0.010 (3) 0.0005 ≤ g ≤ 0.0015 (4) 0.0005 ≤ h ≤ 0.004 (5).

The application relates to the technical field of magnetocaloric materials, and discloses a low-curie-temperature iron-based magnetocaloric material, a preparation method, a deicing agent and a coating. The magnetocaloric material takes iron as the main body, introduces rare earth elements, transition group elements and metalloid elements to form a synergistic component system, and has the characteristics of adjustable curie temperature and high saturation magnetic induction intensity. The preparation method comprises the following steps: alloy smelting and high-temperature homogenization heat treatment, block pretreatment, segmented parameter control hydrogen crushing, and gradient temperature rising high-vacuum dehydrogenation. Through the hydrogenation process combining low-temperature permeation, high-pressure crushing and heat preservation and refinement, the uniform and controllable crushing of the alloy is realized, and the residual hydrogen content is effectively reduced in the multi-stage dehydrogenation process. The application can significantly improve the problems of serious oxidation, uneven particle size and magnetic performance attenuation existing in the traditional mechanical crushing or conventional hydrogen crushing process. The obtained magnetocaloric material shows high saturation magnetic induction intensity and stable magnetocaloric performance in the low curie temperature interval.

The invention relates to a passive temperature antenna sensor (10) comprising: - a plurality of layers of ferroelectric materials (12.1, 12.3, 12.4) arranged side by side on a carrier (11) made of an electrically conductive material, - the layers of ferroelectric materials (12.1, 12.3, 12.4) being made of different ferroelectric materials having different Curie temperatures each associated with a dielectric-constant peak, such that the antenna sensor (10) has multiple resonant frequencies corresponding to the Curie temperatures so as to cover a temperature measurement range, and - a plurality of electrically conductive layers (13.1, 13.3, 13.4) each deposited on a corresponding layer of ferroelectric material (12.1, 12.3, 12.4).

The application discloses a low-loss high-Curie-point bismuth ferrite-barium titanate lead-free piezoelectric ceramic material and a preparation method thereof. 1.02 FeO3-(0.25-x)BaTiO3-xCaZrO3+y%GeO2+z%MnO2; wherein x, y and z represent molar fractions, 0.005<=x<=0.020, 0.3<=y<=1, 0.5<=z<=1.5. The application introduces the third component CaZrO3, and adds GeO2 and MnO2, controls the crystal phase composition and the conductive carrier concentration, improves the microstructure, reduces the loss and improves the temperature stability, so that the Curie temperature, the depolarization temperature and the piezoelectricity are obviously improved. The lead-free piezoelectric ceramic material provided by the application has a simple synthesis process, and is expected to be applied to the preparation of high-temperature piezoelectric sensor devices.

Disclosed is an article for use with apparatus for heating smokable material to volatilize at least one component of the smokable material. The article includes a smokable material, such as tobacco, and a heater for heating the smokable material. The heater comprises heating material that is heatable by penetration with a varying magnetic field. The heating material has a Curie point temperature that is less than the combustion temperature of the smokable material.

A method for producing a working component for a magnetic heat exchanger, comprising: Selecting for each of the two or more sections of the working component of amounts of La, Fe, M and of one or more of the elements of T and R which are suitable to form a La 1-a R a (Fe 1-x-y T y M x ) 13 H z-phase, where T is one or more of the elements from the group consisting of Mn, Co, Ni and Cr, M is silicon and optionally aluminum, and R is one or more of the elements from the group consisting of Ce, Nd, Y and Pr, where the amount of silicon is within the range of 0.05 ≤ x ≤ 0.2 and the amount of one or more of the elements R and T is selected within the ranges 0 ≤ a ≤ 0.5 and 0.003 ≤ y ≤ 0.2, where the amount of the one or more elements of T and R and the amount of Si are selected for each of the two or more sections to provide the two or more sections with different Curie temperatures and similar sintering activities, Mixing the amount of the selected elements of T, R and M with La, Fe or alloys thereof in amounts suitable to produce the La 1-a R a (Fe 1-x-y T y M x ) 13 H z-phase to produce two or more precursor powder mixtures, Producing a green body from the two or more precursor powder mixtures, Heat treatment of the green body at a temperature T sinter and producing a working component having two or more sintered sections, each having a different T c and a density, d, within a range of ±5% or ±2% of the mean density, d av , a total number of sintered sections, wherein a single monolithic green body is formed from two or more precursor powder mixtures and heat treated to form a single monolithic working component having two or more sintered sections.

The invention relates to a passive temperature sensor-antenna (10) comprising: - a plurality of layers of ferroelectric materials (12.1, 12.3, 12.4) arranged side by side on a support (11) made of an electrically conductive material, - said layers of ferroelectric materials (12.1, 12.3, 12.4) being made of different ferroelectric materials having different Curie temperatures, each associated with a peak in dielectric constant, so that said sensor-antenna (10) exhibits several resonance frequencies corresponding to the Curie temperatures to cover a temperature measurement range, and - a plurality of electrically conductive layers (13.1, 13.3, 13.4) each deposited on a corresponding layer of ferroelectric material (12.1, 12.3, 12.4). Figure 4

The invention relates to a passive temperature sensor-antenna (10) comprising: - a plurality of layers of ferroelectric materials (12.1, 12.3, 12.4) arranged side by side on a support (11) made of an electrically conductive material, - said layers of ferroelectric materials (12.1, 12.3, 12.4) being made of different ferroelectric materials having different Curie temperatures, each associated with a peak in dielectric constant, so that said sensor-antenna (10) exhibits several resonance frequencies corresponding to the Curie temperatures to cover a temperature measurement range, and - a plurality of electrically conductive layers (13.1, 13.3, 13.4) each deposited on a corresponding layer of ferroelectric material (12.1, 12.3, 12.4). Figure 4

This invention relates to a method for preparing tritelluride microsheets, comprising the following steps: Step 1, M... 2+ and / or M 3+ A precursor solution is obtained by dissolving the precursor solution in an organic solvent. Tri-n-octylphosphine and Te are then mixed to obtain a mixed solution; M is at least one of Cr, V, and Gd. Step two: The precursor solution and the mixed solution are stirred and reacted to obtain MTe3 seed crystals. Step two: The MTe3 seed crystals are added to the precursor solution and then to the mixed solution for further reaction to obtain tritelluride microsheets. This method allows for balanced and controllable crystal growth, significantly improving the lateral dimensions and crystal integrity of the CrTe3 microsheets. The CrTe3 microsheets prepared using this method exhibit excellent structural integrity, with lateral dimensions ranging from 2 to 200 μm, and demonstrate intrinsic ferromagnetic behavior at high Curie temperatures, providing a new technical approach for the large-scale fabrication of high-performance two-dimensional magnetic materials and spintronic devices.

Disclosed herein are magnetocaloric materials comprising alloys useful for magnetic refrigeration applications. The disclosed alloys include Dysprosium, Erbium, Holmium, Yttrium, or Terbium, and Cerium, Neodymium, and / or Gadolinium components that are fairly inexpensive. In certain embodiments, the materials exhibit second-order magnetic phase transitions near their Curie temperatures with negligible thermal and structural hysteresis losses, making them attractive for magnetic refrigeration. Surprisingly, the performance of the disclosed materials is comparable to or better than that of other expensive, rare-earth-based magnetocaloric materials.

The application discloses a preparation method of a high-entropy amorphous magnetic ring with a high Curie point, and the high-entropy amorphous magnetic ring comprises Co 25-30%, Fe 25-30%, Ni 15-20%, Si 10-15% and B 10-15% in terms of atomic ratio. The preparation method comprises the following steps: configuring a master alloy, repeatedly melting the master alloy for multiple times by using a vacuum induction furnace under certain temperature and time, ensuring that the components of the alloy ingot are fully uniform, and then using a single-roller rapid quenching method to prepare amorphous strip in a non-vacuum environment, and rolling the amorphous strip into a magnetic ring. The amorphous nanocrystalline magnetic ring obtained by the step-by-step heat treatment mode of ordinary heat treatment and longitudinal magnetic field heat treatment has a high squareness ratio, low coercivity and high saturation magnetic induction intensity, and is suitable for the fields of high remanence ratio switches, lock type devices, high-frequency inductors, photovoltaic transformers and the like.

The invention discloses an integrated energy conversion device based on cold and heat energy exchange and negative correlation characteristic coupling of temperature and magnetic force or magnetic conductivity characteristics, and relates to the technical field of energy conversion. The device comprises a temperature difference control magnetic force system, a cold and heat energy supply module, a cold and heat conduction path, an integrated control and power supply module and the like, and is directly thermally coupled through negative correlation characteristics of a cold and heat energy manufacturing system-temperature and magnetic force or magnetic conductivity characteristics, or a cold and heat energy manufacturing system-Curie effect dual-thermal coupling architecture. By utilizing the characteristic that the temperature is negatively correlated with the magnetic force or magnetic conductivity of a ferromagnetic substance and combining a cold and heat energy manufacturing system, the energy conversion is realized by supplying cold and heat energy of a magnetothermal effect or a refrigeration cycle.

The present application belongs to the field of electronic information functional materials and microelectronic devices, and relates to a microwave ferrite material, and particularly provides an LTCC high-curie-temperature NiZn ferrite substrate material and a preparation method thereof, to solve the defects of the existing low-temperature sintering NiCuZn ferrite substrate material, such as low curie temperature, high microwave magnetic loss and dielectric loss, low saturation magnetization and low dielectric constant; the present application uses Cu-doped high Ni / Zn ratio NiZn ferrite as a main material, and uses Bi2O3-CuO composite eutectic mixture as an auxiliary material, and the two are low-temperature co-fired to form a substrate material, which not only has a low sintering temperature (about 900 DEG C), but also has excellent microwave characteristics: high curie temperature (about 302 DEG C), low ferromagnetic resonance line width (about 100 Oe), low dielectric loss (loss tangent value about 8*10 ‑4 ) and high saturation magnetization (about 4959 Guass), which not only meets the requirements of the LTCC process, but also has excellent magnetic properties of the key substrate material required by the microwave ferrite device.

According to the low-cost high-magnetic-conductivity high-magnetic-shielding magnetically soft alloy and the preparation method thereof, Fe-Si-Al is adopted as a basic system, microalloying elements such as B and Nb are creatively introduced, specific critical cold rolling and magnetic field heat treatment processes are adopted, and the obtained magnetically soft alloy has high magnetic conductivity and high magnetic shielding effectiveness. Wherein the resistivity of the alloy is effectively improved and the magnetocrystalline anisotropy is optimized through the synergistic effect of Si and Al; the grain boundary segregation effect of the B element purifies the grain boundary, and the moving resistance of the magnetic domain wall is remarkably reduced; and the dispersed precipitated phase formed by the Nb element effectively refines the initial crystal grains and lays a foundation for subsequent formation of uniform and thick recrystallized crystal grains. Particularly, a strong Gaussian texture is induced through accurately controlled critical cold rolling deformation, and magnetic domains are directionally arranged in an easy magnetization direction in combination with magnetic field heat treatment applied near a Curie point, so that the coercive force is fundamentally reduced, and the initial magnetic conductivity is improved.

The invention belongs to the technical field of electronic ceramics, and particularly discloses a low-Curie-temperature medium-entropy lead magnesium tungstate-based ceramic and a preparation method and application thereof, the chemical general formula of the low-Curie-temperature medium-entropy lead magnesium tungstate-based ceramic is Pb (Mg < 1 / 4 > W < 1 / 4 > B '< 1 / 4 > B' < 1 / 4 >) O3, B '= Yb < 3 + > or Lu < 3 + >; b ''= Nb < 5 + > or Ta < 5 + >. According to the low-Curie-temperature medium-entropy lead magnesium tungstate-based ceramic and the preparation method and application thereof, the Curie temperature TC of the lead magnesium tungstate ceramic can be effectively reduced through the method, the dielectric constant is increased, low dielectric loss is kept, and the obtained ceramic has a pure perovskite structure and good compactness; the phase change temperature of the lead magnesium tungstate-based antiferroelectric ceramic ranges from-11 DEG C to-24 DEG C, the maximum relative dielectric constant ranges from 800 to 1100, the maximum dielectric loss tan delta ranges from 0.05 to 0.065, and the problems that an existing lead magnesium tungstate-based antiferroelectric ceramic is high in phase change temperature and low in dielectric constant can be solved.

A manufacturing method for a permanent magnet includes a magnetization step of magnetizing a to-be-magnetized object by a magnetizer including a field magnet unit having a plurality of permanent magnets for magnetization configured to generate a magnetic field on the to-be-magnetized object arranged at equal intervals and a heating unit having a heating surface opposing the to-be-magnetized object in an axial direction of the to-be-magnetized object and configured to heat the to-be-magnetized object. In the magnetization step, the to-be-magnetized object is disposed on the field magnet unit, the to-be-magnetized object is heated by the heating unit to a temperature equal to or higher than a Curie point of the to-be-magnetized object and lower than the Curie point of the permanent magnets for magnetization, and then the temperature is lowered to a temperature lower than the Curie point of the to-be-magnetized object, and a magnetization magnetic field is applied to the to-be-magnetized object by the permanent magnets for magnetization.

This invention discloses a high Curie point, low voltage, and low resistance ceramic PTC element, its preparation method, and its application, relating to the field of ceramic PTC technology. The invention uses a solid solution system composed of barium titanate and lead titanate as the main components, controlling the molar ratio of barium to lead within the range of 0.63-0.70:0.30-0.37. This allows the Curie point of the material to be stably distributed in the high-temperature range of 240℃ to 280℃. By optimizing the doping system, a high temperature coefficient of resistance and a high step-up resistance ratio are maintained while achieving low room temperature resistance. The invention employs separate pre-firing methods, allowing barium titanate and lead titanate to be synthesized and semiconducted separately under their respective optimal temperature conditions, ensuring precise control of the Curie point. This avoids localized inhomogeneities caused by difficulties in solid solution during final mixing, achieving controllable and repeatable product performance, suitable for large-scale production. This invention successfully solves the problems of high Curie point, low voltage, and low resistance PTC element preparation difficulty and unstable performance in existing technologies, and has good prospects for industrial application.

An active magnetic regenerator according to one embodiment comprises: a housing; a plurality of magnets disposed outside the housing; a Peltier element disposed inside the housing; a plurality of magnetocaloric materials disposed in a line on both sides of the Peltier element inside the housing and having different Curie temperatures; a plurality of connectors connecting each of the plurality of magnetocaloric materials to the Peltier element; a power supply unit for supplying power to the Peltier element; and a controller for controlling the power supply unit.

The embodiment of the invention relates to the technical field of emergency protection devices of reactors, in particular to an armature assembly, a passive shutdown device and a reactor. The armature assembly comprises an inner armature, an outer armature, an armature sheath and Curie point soft magnetic alloy. Along the radial direction of the inner armature, the armature sheath is fixedly arranged between the outer armature and the inner armature. The Curie point soft magnetic alloy is fixedly connected with the inner armature, and the magnetic force borne by the Curie point soft magnetic alloy at the position where the Curie point soft magnetic alloy is located is the maximum. By means of the armature assembly, when the temperature in a reactor is lower than the Curie temperature of a Curie-point magnetically soft alloy, it can be ensured that the armature assembly is stably attracted by electromagnetic force generated by the electromagnet assembly, accidental falling of the armature assembly is avoided, and when the temperature in the reactor rises to the Curie temperature, the armature assembly and the electromagnet assembly can be rapidly demagnetized, and the electromagnetic effect is improved. Therefore, the armature assembly drives the control rod to fall into the reactor core, rapid and safe reactor shutdown is realized, and the reliability and sensitivity of the passive reactor shutdown device are improved.

The invention discloses a high-permeability and high-Curie-temperature iron-poor manganese zinc ferrite material and a preparation method thereof, and belongs to the field of soft magnetic ferrites. Comprising a main material and an auxiliary material, the main material is composed of an iron compound, a zinc compound, a cobalt compound and a manganese compound, the iron compound accounts for 46-50 mol% in terms of Fe2O3 conversion amount, the zinc compound accounts for 12-16 mol% in terms of ZnO conversion amount, the cobalt compound accounts for 1-3 mol% in terms of Co2O3 conversion amount, and the manganese compound accounts for the balance in terms of MnO conversion amount; the auxiliary material is prepared from the following components: TiO2, CaCO3, V2O5, SiO2 and Nb2O5. The method aims at obtaining the initial magnetic conductivity gt; 3000, Curie temperature gt; and the iron-poor manganese zinc ferrite material can be obtained at 180 DEG C.

The application provides a high-precision inversion method for the crustal interior based on aeromagnetic data, which comprises the following steps: preprocessing the aeromagnetic data of a target area, eliminating noise and interference, and extracting regional magnetic anomaly information related to the deep crustal interior; constructing a residual magnetization strength model based on a depth attenuation function, and obtaining the residual magnetization strength of each grid point in the target area according to the target area and the residual magnetization strength model; establishing a nonlinear decay model of the residual magnetization strength with depth based on the residual magnetization strength model, and obtaining the magnetic anomaly strength generated on the ground by each depth layer in the target area by using the nonlinear decay model; and inputting the regional magnetic anomaly information, residual magnetization probability parameters, geological constraints and magnetic anomaly strength into a crustal interior inversion model to obtain the depth prediction value of the target area. The application considers the influence of residual magnetization on the magnetization direction, and improves the inversion precision of the crustal interior.

The invention discloses a low-loss high-Curie-temperature high-permeability manganese zinc ferrite material and a preparation method thereof, and belongs to the technical field of manganese zinc ferrite materials. The manganese zinc ferrite material with low loss, high Curie temperature and high magnetic permeability is composed of a main component and an additive, and the main component is composed of the following raw materials in molar percentage: 50.5-54.5 mol% of Fe2O3, 17.5-27.5 mol% of MnO and the balance of ZnO; on the basis of the total weight of the main components, the additive is prepared from the following raw materials in content: 400 to 600 ppm of V2O5, 600 to 800 ppm of Bi2O3, 700 to 800 ppm of Nb2O5, 1400 to 1600 ppm of MoO3, 1300 to 1500 ppm of TiO2, 800 to 1100 ppm of CaCO3 and 700 to 1200 ppm of SiO2. According to the invention, the problem that the initial permeability, loss and Curie temperature of the manganese-zinc ferrite cannot be synergistically optimized in the prior art is solved.