期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 815, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152397
关键词
Tetragonal tungsten bronze; Microstructure; Dielectric properties; Niobium compounds
资金
- National Natural Science Foundation of China [51502191]
- Scientific Research Project of Shaanxi Province Office of Education [2018JQ5182]
- Young Talent Support Program of Shaanxi Province University [20170708]
The dielectric behaviors of the tetragonal tungsten bronze (TTB) structured ceramics have been extensively studied by doping other elements due to their compositional flexibility. The microstructure of ceramics will inevitably vary with the change of chemical composition. In order to clarify the microstructural effect, the dielectric properties of the KSr2Nb5O15 (KSN) ceramics with various grain microstructures were investigated. Successful preparation of the KSN ceramics with same chemical compositions and different microstructures could be attributed to the usage of microcrystalline powder with different particle size distributions. It was found that the dielectric characteristics varied significantly with microstructures of the KSN ceramics. A new low-temperature dielectric anomaly appeared in the ceramics with a duplex structure. In addition, the peak shifted with the change of grain size distribution. These results suggested that the microstructural influence should not be neglected for the studies of the origin of the dielectric anomalies in TTB structured ceramics. (C) 2019 Elsevier B.V. All rights reserved.
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