High-dielectric low-loss doped barium calcium titanate ceramic and preparation method thereof

A technology of barium calcium titanate and dielectric loss, applied in the field of high dielectric low loss doped barium calcium titanate ceramics and its preparation, to achieve the effect of improving dielectric temperature stability and great application potential

Pending Publication Date: 2022-08-05
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For the above BaTiO 3 Lead-free ceramics based on high dielectric, low loss, good thermal stability and T s High technical problem, the present invention provides a high dielectric constant, low loss, high temperature stability doped barium calcium titanate ceramics and its preparation m...

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  • High-dielectric low-loss doped barium calcium titanate ceramic and preparation method thereof
  • High-dielectric low-loss doped barium calcium titanate ceramic and preparation method thereof
  • High-dielectric low-loss doped barium calcium titanate ceramic and preparation method thereof

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specific Embodiment approach 1

[0018] Embodiment 1: The chemical formula of a high-dielectric and low-loss doped barium-calcium titanate ceramic in this embodiment is Ba 0.70 Ca 0.30 Ti 1-x (Nb 0.5 Fe 0.5 ) x O 3 , where x is in the compound (Nb 0.5 Fe 0.5 ) 4+ The mole ratio, 0.04≤x≤0.06.

specific Embodiment approach 2

[0019] Specific embodiment 2: The preparation method of a high dielectric and low loss doped barium calcium titanate ceramic in this embodiment is carried out according to the following steps:

[0020] (1) According to the chemical composition Ba 0.70 Ca 0.30 Ti 1-x (Nb 0.5 Fe 0.5 ) x O 3 The stoichiometric ratio of the analytically pure grade pharmaceutical powder BaCO 3 , CaCO 3 , TiO 2 , Fe 2 O 3 and 98% pure MnO 2 Powder, of which 0.04≤x≤0.06, mix the weighed powder, put it into anhydrous ethanol medium, use agate grinding ball as the ball milling medium, and use a planetary ball mill to wet ball mill at a speed of 150-175 r / min for 20 Mix evenly for ~24h, wherein the ratio of the mass of the anhydrous ethanol medium to the total mass of the powder is (1.1~1.5):1; the grinding balls used are made of agate balls with diameters of 20mm, 10mm and 6mm according to the number ratio of 1:11 : 16 compositions, drying slurry;

[0021] (2) adding the deionized water of...

specific Embodiment approach 3

[0025] Embodiment 3: This embodiment differs from Embodiment 2 in that: in step (1), x=0.06, and x=0.08. Others are the same as in the second embodiment.

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Abstract

The invention relates to a high-dielectric low-loss doped barium calcium titanate ceramic and a preparation method thereof, and belongs to the technical field of inorganic non-metallic materials. The lead-free, non-volatile and toxic element-free doped barium calcium titanate ceramic is prepared by adopting a traditional solid-phase reaction method, the chemical formula is Ba0. 70Ca0. 30Ti1-x (Nb0. 5Fe0. 5) xO3, x is the mole number of (Nb0. 5Fe0. 5) 4 < + > and is larger than or equal to 0.04 and smaller than or equal to 0.06, and the material is simple in preparation process, low in cost, low in sintering temperature (1230-1300 DEG C), larger than 4100 in room temperature relative dielectric constant and low in dielectric loss (tan delta lt below 1kHz); 0.037), the dielectric temperature stability is good (the change rate 1t of the relative dielectric constant along with the temperature in the range of room temperature to 200 DEG C; the preparation method is suitable for preparing a high-energy density memory and a high-capacity capacitor, and has a relatively high industrial application value.

Description

technical field [0001] The invention relates to the field of preparation of inorganic non-metallic materials, in particular to the technical field of ferroelectric ceramic materials, and provides a high-dielectric and low-loss doped barium-calcium titanate ceramic and a preparation method thereof. , Barium and calcium titanate modified ceramics with high dielectric and low loss without volatile and non-toxic elements, specifically a low-temperature sintered Ba 0.70 Ca 0.30 Ti 1-x (Nb 0.5 Fe 0.5 ) x O 3 Ceramics are suitable for the preparation of high-energy-density memory and large-capacity capacitors. The preparation process is simple, low-cost, green and environmentally friendly, and conforms to the development direction of dielectric materials. 3 base and Bi 0.5 Na 0.5 TiO 3 Compared with base dielectric ceramics, it has higher industrial application value. Background technique [0002] With the rapid development of economy and technology, the control of toxic ...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622C04B35/64H01G4/12
CPCC04B35/468C04B35/622C04B35/64H01G4/1227C04B2235/3208C04B2235/3236C04B2235/3215C04B2235/3272C04B2235/3251C04B2235/77C04B2235/96C04B2235/6562C04B2235/6567
Inventor 李彩霞王婉茹刘一帆王泽宇赵艺雯杨森王相宜
Owner HARBIN UNIV OF SCI & TECH
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