Some A6B5O18 cation-deficient perovskites in the BaO-La2O3-TiO2-Nb2O5 system期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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

Authors:	Hui Zhang Liang Fang R. Dronskowski R.Z. Yuan

Affiliation:	^a State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, P.R. China ^b Institute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, Germany

Abstract:	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_nB_n₋₁O₃_n (n=6) type cation-deficient perovskites with space group and lattice constants , and for Ba₅LaTi₂Nb₃O₁₈; , and 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 (τ_f) of these ceramics is decreased with the increase of B-site bond valence.

Keywords:	Cation-deficient perovskite Dielectric materials X-ray powder diffraction
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