Effect of lanthanum substitution at A site on structure and enhanced properties of new Aurivillius oxide K 0.25Na 0.25La 0.5Bi 2Nb 2O 9

Changbai Long, Huiqing Fan

科研成果: 期刊稿件文章同行评审

55 引用 (Scopus)

摘要

Aurivillius ferroelectrics K 0.25Na 0.25La 0.5Bi 2Nb 2O 9 (KNBN-La) and K 0.25Na 0.25Bi 2.5Nb 2O 9 (KNBN-Bi) were prepared by using solid-state reaction process. Rietveld refinements for the KNBN-La and KNBN-Bi were carried out by using powder X-ray diffraction at room temperature and they were confirmed to be two-layer Aurivillius oxides with orthorhombic space group A2 1am. The lattice parameters are a = 5.50468(10) Å, b = 5.49217(10) Å, and c = 25.05108(35) Å for KNBN-La and a = 5.48867(6) Å, b = 5.47895(6) Å, and c = 25.10591(25) Å for KNBN-Bi. Lanthanum (La 3+) substitution for bismuth (Bi 3+) led to an enhancement in relaxation behavior for the KNBN-La ceramics, with a ferroelectric to paraelectric phase transition temperature (T c) of about 360 °C. The KNBN-La ceramics had a high remnant polarization (P r) of 13.6 μC cm -2 and a field-induced strain of up to 0.031%. Particularly, the decrease in P r for the KNBN-La ceramics after 10 8 cumulative switching cycles was only 6%.

源语言英语
页(从-至)11046-11054
页数9
期刊Dalton Transactions
41
36
DOI
出版状态已出版 - 28 9月 2012

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