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

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 ...

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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 method, the Ba 0.70 Ca 0.30 Ti 1-x (Nb 0.5 Fe 0.5 ) x o 3 Ceramics at room temperature ε r As high as 4869, the dielectric loss tanδ is lower than 0.037, and the dielectric constant is stable from room temperature to 200°C (the change rate of dielectric constant with temperature △ε r / ε r <35%)

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