Some A6B5O18 cation-deficient perovskites in the BaO-La2O3-TiO2-Nb2O5 system

被引：29
作者：
Zhang, H
Fang, L
Dronskowski, R
Müller, P
Yuan, RZ
机构：
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
[2] Rhein Westfal TH Aachen Univ, Inst Inorgan Chem, D-52056 Aachen, Germany
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 11期
基金：
中国国家自然科学基金;
关键词：
cation-deficient perovskite; dielectric materials; X-ray powder diffraction;
D O I：
10.1016/j.jssc.2004.08.003
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Some dielectric oxides have been synthesized and characterized in the BaO-La2O3-TiO2-Nb2O5 system. Through Rietveld refinement of X-ray powder diffraction data, Ba5LaTi2Nb3O18 and Ba4La2Ti3Nb2O18 are identified as the A(n)B(n-1)O(3n) (n = 6) type cation-deficient perovskites with space group R (3) over barm and lattice constants a = b = 5.7106(1) Angstrom, and c = 42.0666(5) Angstrom for Ba5LaTi2Nb3O18; a = b = 5.6602(1) Angstrom, and c = 41.8296(5) Angstrom for Ba4La2Ti3Nb2O18, respectively. Their ceramics exhibit high dielectric constant up to 57 and high quality factors (Qf) up to 21,273 GHz. The temperature coefficient of resonant frequency (tau(f)) of these ceramics is decreased with the increase of B-site bond valence. (C) 2004 Elsevier Inc. All rights reserved.
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收藏
页码：4007 / 4012
页数：6
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