Abstract
The dielectric properties of lead-free solid solution, 0.5BaTiO3–0.5Bi(Mg1/2+x/6Ti(1−x)/2Nbx/3)O3 (x=0.01–0.25), synthesized via a conventional solid state route were investigated. The thermal stability range of relative permittivity remarkably increased with an increase in x from 0.01 to 0.25. 0.5BaTiO3–0.5Bi(Mg1/2+x/6Ti(1−x)/2Nbx/3)O3 (x=0.20) composition showed high temperature stable relative permittivity (1100), revealing a change of less than ±15% across 55–500°C and loss tangent (≤0.025) over the temperature range 102–425°C. In comparison with other known materials for high temperature applications, the excellent temperature stability and high electrical resistivity of the x=0.2 composition suggested that this material can be a promising base material for fabrication of high temperature ceramic capacitors.
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