X-ray diffraction, <sup>119sup>Sn M&#xf6;ssbauer and thermal study of SnSe–Bi<sub>2sub>Se<sub>3sub> system

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• 作者：K. Adouby ; M.L. Elidrissi Moubtassim ; C.P. Vicente ; J.C. Jumas ; A.A. Touré
• 关键词：Sn chalcogenides ; Phase equilibrium diagram ; <sup>119sup>Sn M&#xf6 ; ssbauer spectroscopy ; Crystalline structure
• 刊名：Journal of Alloys and Compounds
• 出版年：2008
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：3 April 2008
• 卷：453
• 期：1-2
• 页码：161-166
• 文件大小：399 K

摘要

The phase equilibrium diagram of the SnSe–Bi<sub>2sub>Se<sub>3sub> system has been re-investigated using X-ray powder diffraction, thermal analysis (DTA and DSC) and <sup>119sup>Sn M&#xf6;ssbauer spectroscopy data. It shows solid solutions based on Bi<sub>2sub>Se<sub>3sub> and SnSe (src="http://www.sciencedirect.com/scidirimg/entities/204e.gif" alt="greek small letter alpha" title="greek small letter alpha" border="0"> and β forms) and three intermediate phases: well-defined, SnBi<sub>4sub>Se<sub>7sub>, SnBi<sub>4sub>Se<sub>7sub>, and a new phase Sn<sub>2sub>Bi<sub>2sub>Se<sub>5sub>. The new phase Sn<sub>2sub>Bi<sub>2sub>Se<sub>5sub> exists in the composition range 25–55 mol%Bi<sub>2sub>Se<sub>3sub>. Its structure is still under study. However, <sup>119sup>Sn M&#xf6;ssbauer spectroscopy study of the latter allowed to achieve a well knowledge of the local environment of tin atoms and could contribute to the actual structural study.