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所属单位：材料科学与技术学院
发表刊物：JOURNAL OF ALLOYS AND COMPOUNDS
关键字：Ca0.66Ti0.66R0.34Al0.34O3 (R = La, Sm and Nd) ceramics Perovskite Microwave dielectric properties Crystal structure Rare earth element substitution Raman spectra Rietveld refinement
摘要：The influence of substitution with rare earth elements in orthorhombic Ca0.66Ti0.66R0.34Al0.34O3 (R = Sm, Nd, La) perovskite ceramics, which were successfully produced with a solid-state reaction method, on their crystal structure (analyzed with Rietveld refinement of X-ray diffractograms and Raman spectroscopy) and on the microwave dielectric properties was investigated. The dielectric constant (epsilon(r)) increased due to the increase of cell volume, which was a result of the increase of the ionic radius of the rare earth cations incorporated in the host lattice R3+. The values of the quality factors were 43620.74, 41292.71, and 38389.57 GHz for the Sm-, Nd-, and La-containing ceramics, respectively. The decrease of these values is correlated to the level of distortion of the octahedral due to the incorporation of the three different rare earth cations. The temperature coefficient of resonant frequency increased from 4.99 for the Sm-ceramics to 9.92 ppm/degrees C for the La-ceramics, attributed to the increase of cell polarization. (C) 2016 Elsevier B.V. All rights reserved.
ISSN号：0925-8388
是否译文：否
发表时间：2017-02-05
合写作者：Xu, Yue,傅仁利,Agathopoulos, Simeon,Wang, Xu,王旭东,Yang, Yang,董洋洋,Cai, Junde
通讯作者：傅仁利,Agathopoulos, Simeon,徐月芳