1626results about "Ceramics" patented technology

Described herein are precursors and methods of forming dielectric films. In one aspect, there is provided a silicon precursor having the following formula I:

wherein R¹ is independently selected from hydrogen, a linear or branched C₁ to C₆ alkyl, a linear or branched C₂ to C₆ alkenyl, a linear or branched C₂ to C₆ alkynyl, a C₁ to C₆ alkoxy, a C₁ to C₆ dialkylamino and an electron withdrawing group and n is a number selected from 0, 1, 2, 3, 4, and 5; and R² is independently selected from hydrogen, a linear or branched C₁ to C₆ alkyl, a linear or branched C₂ to C₆ alkenyl, a linear or branched C₂ to C₆ alkynyl, a C₁ to C₆ alkoxy, a C₁ to C₆ dialkylamino, a C₆ to C₁₀ aryl, a linear or branched C₁ to C₆ fluorinated alkyl, and a C₄ to C₁₀ cyclic alkyl group.

A niobium suboxide powder comprising 100 to 600 ppm of magnesium is described. The niobium suboxide powder may (alternatively or in addition to 100 to 600 ppm of magnesium) further include 50 to 400 ppm of molybdenum and/or tungsten. The niobium suboxide powder is suitable for the production of: capacitors having an insulator layer of niobium pentoxide; capacitor anodes produced from the niobium suboxide powder; and corresponding capacitors.

To provide a grain oriented ceramic capable of exerting excellent piezoelectric properties, a production method thereof, and a piezoelectric material, a dielectric material, a thermoelectric conversion element and an ion conducting element each using the grain oriented ceramic, there is provided a grain oriented ceramic comprising, as the main phase, an isotropic perovskite-type compound which is represented by formula (1): {Li_x(K_1−yNa_y)_1−x}(Nb_1−z−wTa_zSb_w)O₃ in which x, y, z and w are in respective composition ranges of 0≦x≦0.2, 0≦y≦1, 0≦z≦0.4, 0≦w≦0.2 and x+z+w>0. The main phase comprises a polycrystalline body containing from 0.0001 to 0.15 mol of any one or more additional element selected from metal elements, semimetal elements, transition metal elements, noble metal elements and alkaline earth metal elements belonging to Groups 2 to 15 of the Periodic Table, per mol of the compound represented by formula (1). A specific crystal plane of each crystal grain constituting said polycrystalline body is oriented.

An article of manufacture comprises a substrate and a layer of N_(x)Y_(1−x)AlO₃ on the substrate where x is a molar fraction greater than zero and less than one, and N is an element selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. The article may be an electronic device further comprising an electrode electrically isolated from the substrate by the layer. In particular, the dielectric properties of the layer are such that the layer is especially although by no means exclusively useful for electrically isolating gate electrodes in field effect transistor devices. The layer may be formed on the substrate via molecular beam epitaxy.

The present invention provides for a method of impregnating a matrix with a high thermal conductivity filled resin 32, which produces a resin impregnated matrix. The high thermal conductivity material 30 comprises 5-60% by volume of the resin 32. This is compressed by approximately 5-30%, and the distances between the high thermal conductivity materials loaded in the resin are reduced, and the resin is then cured.

The present invention relates to composite materials with a high dielectric constant and high dielectric strength and to methods of producing the composite materials. The composite materials have high dielectric constants at a range of high frequencies and possess robust mechanical properties and strengths, such that they may be machined to a variety of configurations. The composite materials also have high dielectric strengths for operation in high power and high energy density systems. In one embodiment, the composite material is composed of a trimodal distribution of ceramic particles, including barium titanate, barium strontium titanate (BST), or combinations thereof and a polymer binder.

A semiconductor ceramic having a negative temperature coefficient of resistance, the element comprising about 0.1 to 20 mol % of AMnO3 (A represents at least one of Ca, Sr, Ba, La, Pr, Nd, Sm, Eu, Gd, Th, Dy and Ho) and to a spinel composite oxide made of a solid solution of Mn and at least one element in Ti, V, Cr, Fe, Co, Ni, Cu, Zn, Mg and Al. As a perovskite Mn composite oxide, one or more of CaMnO3, SrMnO3, BaMnO3, LaMnO3, PrMnO3, NdMnO3, SmMnO3, EuMnO3, GdMnO3, TbMnO3, DyMnO3 and HoMnO3 may be used.

The invention discloses a Ti-based microwave medium ceramics material by low-temperature sintering. The Ti-based microwave medium ceramics material takes rutile TiO2 as a main phase. The general formula of the prescription of the invention is that: (AxM2x)(NyTi1-y)1-3xO2, (BxM3x)(NyTi1-y)1-4xO2, (CxMx)(NyTi1-y)1-2xO2 or (1-m) TiO2-mBi2Ti4O11, wherein, the A is one of bivalent ions such as Zn<2+>, Cu<2+>, Ni<2+>, the B one of univalent ions such as Li<+>, the C one of trivalent ions such as Al<3+>, Fe<3+>, M is one of pentavalent ions such as Nb<5+>, Ta<5+>, Sb<5+>, N one of quadrivalent ions such as Zr< 4+ >, Sn< 4+ >, Mn< 4+ >; the X is more than or equal to 0 and less than or equal to 0.25, the Y more than or equal to 0 and less than or equal to 0.5, the m more than or equal to 0 and less than or equal to 0.15, the n is more than or equal to 0 and less than or equal to 2. The microwave medium ceramics material by low-temperature sintering has the advantages of high dielectric constant, low dielectric loss, wide covering range of temperature coefficient of resonant frequency, low sintering temperature, simple preparation technique and adjustable temperature coefficient of resonant frequency according to materials. The invention can be used for Low Temperature Co-fired Ceramics System (LTCC system) and used for producing microwave devices such as multi-media resonators, filters, etc.

This invention provides a microwave ceramic dielectric material with a low dielectric constant [epsilon]r of 3-8 and a preparation method thereof, and the material is composed of (1-X)Mg2SiO4-XBaTiO3 as a main component, a modification adulterant and a sintering promoter. 1) The said major constituent is a (1-X)Mg2SiO4-XBaTiO3 solid solution, wherein the X=0.001-0.25; 2) The said modification adulterant comprises one or a mixture of more than one of SrCO3, ZrO2, Ta2O5, Nb205, MnO2, CaO, La2O3 and WO3; 3) The said sintering promoter comprises low-melting oxides such as Bi2O3, B2O3, ZnO, SiO2, Al2O3 and Nb2O5,and one or more kinds of the glass powder with a low melting point. After reasonably reasonable formulation, optimizing synthesis and ball milling, the microwave medium material prepared from the method can be sintered at a relatively low temperature of 1340 DEG C to 1380 DEG. C.A microwave capacitor made by this method has an excellent dielectric property: [epsilon]r=3-8>Qf) 60000GHZ, [epsilon] f(-40DEG C. -25DEG C./25 DEG C-125 DEG C)<=20PPM/DEG C.

A formula for medium of intermediate and low temperature sintering high voltage ceramic capacitor is (by weight) BaTiO3 60-90%, SrTiO3 1-20%, CaZrO3 0.1-10%, Nb2O5 0.01-1%, MgO 0.01-1%, CeO2 0.01-0.8%, ZnO 0.01-0.6%, Co2O3 0.03-1%, bismuth lithium solid solution 0.05-10% wherein the BaTiO3, SrTiO3 and CaZrO3 are synthesized from conventional chemical material by solid phase method. Said medium is no lead, no cadmic and no toxicity sintered at 1100-1150 degree centigrade with greater than 6.0 KV/mm of voltage resisting, 2000-3000 dielectric constant etc properties.

The invention provides a microwave dielectric ceramic material and a preparation method thereof, belonging to the technical field of electronic materials. The microwave dielectric ceramic material comprises the following components in percentage by mass: 25-35% of MgO, 60-68% of TiO2, 1-10% of CaO, 0-2% of SiO2, 0-2% of MnO2, 0-2% of Nb2O5 and 0-2% of CeO2; the microwave dielectric ceramic material is prepared by proportioning the MgO, TiO2, CaO, SiO2, MnO2, Nb2O5 and CeO2 according to the mass percentage of each component; performing ball milling and mixing; pre-calcining a mixture at a temperature in a range of 1050-1200 DEG C and sintering the mixture at the temperature in a range of 1250-1360 DEG C. In the invention, the microwave dielectric ceramic material is prepared by utilizing atraditional solid-phase sintering method, the process is simple and the cost is low; according to the prepared microwave dielectric ceramic material, the Q*f value is in a range of 63,000-83,000 GHz,the relative dielectric constant epsilon r is in a range of 20-22, and the temperature coefficient of resonance frequency is within +/-10 ppm/DEG C, so that the preparation requirements of a high-performance microwave device can be met.

A dielectric ceramic composition including a dielectric base phase containing BaTiO3 as a main component, and plate-shaped or acicula deposition phase existing together in the dielectric base phase. Preferably, the dielectric ceramic composition includes a main component of BaTiO3, a first subcomponent including at least one compound selected from MgO, CaG, BaG, SrO and Cr2O3, a second subcomponent of (Ba, Ca)xSiO2+x (where, x=0.8 to 1.2), a third subcomponent including at least one compound selected from V2O5, MoO3, and WO3, and a fourth subcomponent including an oxide of R1 (where R1 is at least one element selected from Sc, Er, Tm, Yb, and Lu), a fifth subcomponent including an oxide of R2 (where R2 is at least one element selected from Y, Dy, Ho, Tb, Gb and Eu), wherein the ratios of the subcomponents to 100 moles of the main component of BaTiO3 are first subcomponent of 0.1 to 3 moles, second subcomponent of 2 to 10 moles, third subcomponent of 0.01 to 0.5 mole, fourth subcomponent of 0.5 to 7 moles, and fifth subcomponent of 2 to 9 moles (where the number of moles of the fourth and fifth subcomponents are respectively the ratio of R1 and R2 alone).

A dielectric ceramic is provided which is can be stably used for a multilayer ceramic capacitor even at a high temperature of approximately 175° C. The dielectric ceramic includes a perovskite type compound represented by the composition formula (B_1-x-yCa_xSn_y)_m(Ti_1-zZr_z)O₃ (where x, y, z, and m satisfy 0≦x≦0.20, 0.02≦y≦0.20, 0≦z≦0.05, and 0.990≦m≦1.015, respectively) as a primary component; and RE as an accessory component (where RE is at least one selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), wherein 0.5 to 20 molar parts of RE is contained with respect to 100 molar parts of the primary component.

A multilayer ceramic capacitor includes a multilayer body including dielectric ceramic layers and inner electrode layers containing Ni and electrically connected to outer electrodes. The dielectric ceramic layers contain a Ba- and Ti-containing perovskite compound, Ca, Mg, R (at least one rare earth metal selected from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y), M (at least one selected from Zr, Mn, Co, Fe, Cr, Cu, Al, V, Mo, and W), and Si. The number of parts by mole of each element relative to Ti as 100 parts is as follows:

• • Ca, approximately 0.10 to 5.00 parts;
  • Mg, approximately 0.0010 to 0.0098 parts;
  • R in total, approximately 0.50 to 4.00 parts;
  • M in total, approximately 0.10 to 2.00 parts; and
  • Si, approximately 0.5 to 2.0 parts.

The invention relates to one semi-conductor materials to realize semi-conductive process meeting the high Curie piezoelectricity ceramics materials without lead, which comprises the following parts: (Na1/2Bi1/2)x(Ba1-x-y+z)TiO3+yM1+zM2O+0.02MnO2mol%, wherein, x=0.01-0.15; y=0.001-0.006; z=0.005-0.05; M1=0.0001-0.006; M2=0.005-0.05; Formula comprises micro semi-conductive element and additive components.

A dielectric ceramic includes, in composition, a perovskite-type compound having the general formula ABO₃ containing Ba, Ca and Ti, and an additive component containing Si, R(La or the like), and M (Mn or the like), the additive component not being solid-dissolved and, moreover, the major component existing in at least 90% of the cross-section of each of the crystal grains of which the number is equal to at least 85% of that of all of the crystal grains contained in the dielectric ceramic, at least the Ba, the Ca, the Ti, the Si, the R, and the M being contained at at least 85% of the analytical points in the crystal grain boundaries of the dielectric ceramic.

The invention discloses a preparing method of niobic acid sodium potassium lithium group leadless piezoelectric ceramic in green energy source material domain, which comprises the following steps: expressing component of niobic acid sodium potassium lithium group as non-stoichiometric ratio general formula (NaaKbLic)(NbxTaySbz)O3 or -nM; expressing a, b, c as A bit element; expressing x, y, z as mole fraction of B bit element; setting the selective rage as (0<=a<=1. 5, 0<=b<=1. 5, 0 C04B 35/495 C04B 35/64 H01B 3/12 H01L 41/187 1 6 1 2007/5/28 101062864 2007/10/31 100465131 2009/3/4 2009/3/4 2009/3/4 University of Science and Technology Beijing Beijing 100083 Zhang Boping Zhao Pei Li Songjie Ding Xiaonian Zhang Hailong liuru e 11207 The Patent Agency of Beijing University of Science and Technology No.30 Xueyuan Road, Beijing 100083