Effects of B-site Co2O3 doping on microstructure and electrical properties of Na0.25K0.25Bi2.5Nb2O9 ceramics
Effects of B-site Co2O3 doping on microstructure and electrical properties of Na0.25K0.25Bi2.5Nb2O9 ceramics
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DOI：
10.1016/j.jallcom.2015.05.168
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发表时间：
2015-10
影响因子：
6.2
通讯作者：
Wan Xinjia;Xiangping Jiang;Hao-chuan Jiang;Jun Jiang
中科院分区：
文献类型：
--
作者：
Wan Xinjia;Xiangping Jiang;Hao-chuan Jiang;Jun Jiang
The effects of cobalt addition on the properties of Na0.25K0.25Bi2.5Nb2O9(NKBN)–based ceramics have been investigated in details. It was found that the ceramics possess a pure phase of bismuth oxide layer–type structure. The Curie temperatureTcgradually increases from 653 °C to 662 °C with increasing the Co modification. The electrical properties of NKBN–based ceramics are improved significantly by the addition of Co. The piezoelectric constantd33, dielectric loss tanδ, mechanical quality factorQmand remanent polarizationPrfor the NKBN ceramics with 0.20 wt% Co2O3modification were found to be 23 pC/N, 0.35%, 3028, 12.03 μC/cm2, respectively. Thermal annealing studies indicated that the cobalt–modified NKBN ceramics system possesses stable piezoelectric properties, demonstrating that the cobalt–modified NKBN–based ceramics are the promising candidates for high–temperature applications.
