标题: | Phase formation and microwave dielectric properties of Pb2+ and Sr2+ doped La4Ti9O24 ceramics |
作者: | Liu, Yuan-Wen Lin, Pang 材料科学与工程学系 Department of Materials Science and Engineering |
关键字: | ceramics;chemical synthesis;electron diffraction;dielectric properties |
公开日期: | 12-十月-2006 |
摘要: | Phase formation and microwave dielectric properties of the Pb2+ and Sr2+ doped La4Ti9O24 ceramics were investigated. Using electron diffraction and Rietveld analysis of the X-ray powder diffraction patterns, we show that the increase in the concentration of Pb2+ and Sr2+ doping results in the structural transition from La4Ti9O24 to a La2/3TiO3-type phase (Ibmm, No. 74). A change in the crystalline phase considerably affects the microwave dielectric properties, increasing the epsilon(r) from 37 to 130, reducing Q x f from 25.000 to 5500, and increasing temperature coefficient of the resonant frequency (TCF) from 15 to 300 ppm/degrees C. (C) 2006 Elsevier Ltd. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.materresbull.2006.03.011 http://hdl.handle.net/11536/11680 |
ISSN: | 0025-5408 |
DOI: | 10.1016/j.materresbull.2006.03.011 |
期刊: | MATERIALS RESEARCH BULLETIN |
Volume: | 41 |
Issue: | 10 |
起始页: | 1845 |
结束页: | 1853 |
显示于类别: | Articles |
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