科研之友
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摘要
A novel system of lead-free dielectric temperature stability materials BaFe0.05Nb0.05Ti0.9O3-Bi0.5Na0.5TiO3-xBiM(2/3)Nb(1/3)O(3) are fabricated via a conventional solid state reaction method. The concerted mechanism on the dielectric properties of different proportion of BMN additive in BaFe(0.05)Nba(0.05)Ti(0.9)O(3)-based ceramics is investigated systematically. The phase transition, and dielectric properties have been obtained by X-ray diffraction and dielectric measurements as a function of chemical composition and temperature. Microstructure and crystal structure are investigated, and electrical responses are observed in the combined modulus and impedance plots. With increasing the BMN non-ferroelectric phase, core-shell structure disappeares, temperature-stable dielectric properties over a wide temperature range. The x = 0.2 ceramic shows the optimal dielectric performance, has TCC values of +/- 15% from -55 to 450 degrees C, with permittivity value at room temperature is 605. The good TCC demonstrates that the BFNT-BNT-xBMN system would have a promising future in application as ultra-broad working temperature and high frequency dielectrics.
