Low-temperature sintered and temperature-stable multilayer ceramic capacitor dielectric materials
Low-temperature sintered and temperature-stable multilayer ceramic capacitor dielectric materials
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C04B 35/468, H01L 41/187, H01G 4/12, H01G 4/30
Tsinghua University
Wang Xiaohui, Ma Chao, Li Longtu, Gui Zhilun
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Low-temperature sintered, temperature-stable, multilayer, ceramic capacitor dielectric materials
The invention discloses a temperature stabilization style multilayer ceramic capacitor dielectric material of low-temperature melt in the electric supplies technique domain, which is characterized by the following: the dielectric material is made up with barium titanate main ingredient and secondary addition agent, which is composed of Nb2O5, Co3O4 or their solid solution, ZnO, B2O3 or their chemical compounds, rare-earth element and one or more than one kind of oxidate of yttrium the agglomeration is at the temperature from 880deg.c to 950deg.c the crystal grain size is 100-600nm the indoor temperature dielectric constant is 1000-2500 capacitance temperature variance ratio is not bigger than 15% the indoor temperature dielectric loss is smaller than 2% the insulation electrical resistivity is bigger than 1011omega .cm and meets the demand of the property of X7R and X8R when the sintering temperature is lower than 900deg.c, we can use fine silver for internal electrode of MLCC.

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