Synthesis and characterization of a new four-layer Aurivillius phase Bi₂SrNa₂Nb₄O₁₅ and its protonated form

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• 作者：Zhenhua Liang ; Kaibin Tang ; Suyuan Zeng ; Dong Wang ; Tanwei Li ; Huagui Zheng
• 关键词：Perovskite ; Aurivillius ; Powder X-ray diffraction ; Protonated forms
• 刊名：Journal of Solid State Chemistry
• 出版年：2008
• 出版时间：October 2008
• 年：2008
• 卷：181
• 期：10
• 页码：2565-2571
• 全文大小：951 K

文摘

A new four-layer Aurivillius phase Bi₂SrNa₂Nb₄O₁₅ has been synthesized by solid-state reaction of Bi₂SrNb₂O₉ and NaNbO₃ at 1100 °C. The detailed structure determination of Bi₂SrNa₂Nb₄O₁₅ performed by powder X-ray diffraction (XRD) shows that it crystallizes in the space group I4/mmm [a3.9021(1) Å, c40.7554(10) Å]. Protonated form of Bi₂SrNa₂Nb₄O₁₅ was obtained by the substitution of bismuth oxide sheets with protons via acid treatment. The conversion into the protonated forms was achieved easily using 6 M HCl at room temperature. Preservation of the structure of the perovskite-like slabs and contraction in the c-axis were confirmed by X-ray analysis. The compositions of the resulting products were determined to be H_1.8[Sr_0.8Bi_0.2Na₂Nb₄O₁₃] by X-ray fluorescence spectroscopy (XFS) and thermogravimetry.