| Splitting of optical mode in (NH_4)_2 PtBr_6 studied by Raman scattering |
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| 作者姓名： | Shi Jinrong NETO M F. d'Aguiar ARNSCHEIDT B PELZL J Xu Yongchen Wu Xiang |
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| 作者单位： | Shi Jinrong;NETO M F. d'Aguiar;ARNSCHEIDT B;PELZL J;Xu Yongchen;Wu Xiang (Pohl Institute of Solid State Physics，Tongji University，Shanghai 200092，P. R. China |
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| 摘 要： | Ｓｐｌｉｔｔｉｎｇｏｆｏｐｔｉｃａｌｍｏｄｅｉｎ（ＮＨ＿４）＿２ＰｔＢｒ＿６ｓｔｕｄｉｅｄｂｙＲａｍａｎｓｃａｔｔｅｒｉｎｇＳｐｌｉｔｔｉｎｇｏｆｏｐｔｉｃａｌｍｏｄｅｉｎ（ＮＨ＿４）＿２ＰｔＢｒ＿６ｓｔｕｄｉｅｄｂｙＲａｍａｎｓｃａｔｔｅｒｉｎｇ￥...
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Splitting of optical mode in (NH_4)_2PtBr_6 studied by Raman scattering |
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| Shi Jinrong,NETO M F. d'Aguiar,ARNSCHEIDT B,PELZL J,Xu Yongchen,Wu Xiang.Splitting of optical mode in (NH_4)_2 PtBr_6 studied by Raman scattering[J].Journal of Atomic and Molecular Physics,1996(1). |
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| Authors: | Shi Jinrong NETO M F d'Aguiar ARNSCHEIDT B PELZL J Xu Yongchen Wu Xiang |
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| Abstract: | NH4)2PtBr6 undergoes a structural phase transition from a cubic to a tetragonal phase at Tc=58K. Raman spectra of (NH4)2PtBr6 have been recorded in the temperature range of 9.5K -295K.Line splittings of the internal modes of the NHtetrahedron and the PtBr-octahedron were observed at low temperatures. All line splittings have been interpreted by using the correlation method. Splittings of the internal modes which suddenly occur point towards a first order phase transformation. Two-fold splitting of the A1-mode of the NH-tetrahedron indicates that there are two different kinds of ammonium ions in the Brayals cell in the tetragonal phase. No librational soft mode has been observed, which indicates an order-disorder no mechanism of this structural phase transition. |
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| Keywords: | Raman scattering Structural phase transition Ammonium Hexahalogenometallate |
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