Investigation of dielectric and magnetic nature of Bi7Fe3Ti3O21
Investigation of dielectric and magnetic nature of Bi7Fe3Ti3O21
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DOI：
10.1016/s0025-5408(99)00093-8
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发表时间：
1999-04-01
影响因子：
5.4
通讯作者：
Bhimasankaram, T
中科院分区：
文献类型：
--
作者：
Srinivas, A;Kumar, MM;Bhimasankaram, T
采用固相烧结法制备了Bi7Fe3Ti3O21陶瓷样品。X射线衍射分析表明，该材料与其他铋层结构铁电体(BLSFs)同构，为单相。从室温到640摄氏度测量的直流电导率显示出两个斜率变化。在30-850摄氏度的温度范围内进行的介电测量表明，在645和820摄氏度的介电异常。还测量了热释电信号并评估了系数。磁化强度测量表明，该材料在80-300K温度范围内具有反铁磁性，在室温下有很小的磁滞。并与其他等结构化合物的性质进行了比较。(C)1999年爱思唯尔科学有限公司。
Ceramic samples of Bi7Fe3Ti3O21 were prepared by a solid-state sintering route. X-ray diffraction showed that the material is single phase and isostructural with other bismuth layer structured ferroelectrics (BLSFs). Dc conductivity measured from room temperature to 640 degrees C showed two slope changes. Dielectric measurements carried out in the temperature range 30-850 degrees C indicated dielectric anomalies at 645 and 820 degrees C. A pyroelectric signal was also measured and the coefficient evaluated. Magnetization measurements indicated that the material is antiferromagnetic in the temperature range 80-300 K, with a small hysteresis at room temperature. The properties are compared with other isostructural compounds. (C) 1999 Elsevier Science Ltd.