Phase evolution, microstructure, thermal stability of (K_(0.45)Na_(0.45)Li_(0.04)La_(0.02))NbO_3-Bi(Ni_(0.5)Zr_(0.5))O_3 ceramics

摘要

(K0.45Na0.45Li0.04La0.02)NbO3-Bi(Ni0.5Zr0.5)O-3[(1 - x)KNLLN-xBNZ, 0 <= x <= 0.02] ceramics were fabricated via a traditional solid state reaction method. The addition of BNZ can enhance the electrical properties of KNLLN ceramics. As x = 0.015, the sample had good performance with high epsilon(r) similar to 1665 and excellent thermal stability (Delta epsilon/epsilon(100 degrees C) <= +/- 12%) from 100 to 447 degrees C, indicating that this ceramic has potential application prospects in wider working-temperature range. The electrical behavior at high temperatures of (1 - x)KNLLN-xBNZ ceramics was also analyzed. The results show that the relaxation induced by the double ionized oxygen vacancies is thermally activated.