Raman spectroscopic study of the phase transitions sequence in Li3Fe2(PO4)3 and Na3Fe2(PO4)3 at high temperature

被引：51
作者：
Bih, H. [2 ]
Bih, L. [1 ]
Manoun, B. [1 ]
Azdouz, M. [1 ]
Benmokhtar, S. [3 ]
Lazor, P. [4 ]
机构：
[1] FST Errachidia, Mat Sci Grp, Errachidia, Morocco
[2] Univ Cadi Ayyad, Mat & Environm Chem Grp, LP2M2E, Marrakech, Morocco
[3] Fac Sci, Solid State Mat Lab, Ben Msik Casablanca, Morocco
[4] Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden
来源：
JOURNAL OF MOLECULAR STRUCTURE | 2009年 / 936卷 / 1-3期
基金：
瑞典研究理事会;
关键词：
Li3Fe2(PO4)(3); Na3Fe2(PO4)(3); Raman spectroscopy; Phase transition; POSITIVE-ELECTRODE MATERIALS; NASICON-TYPE MATERIALS; LITHIUM INSERTION; THERMO-RAMAN; DISORDER; TRANSFORMATION; INTERCALATION; CONDUCTIVITY; LI3CR2(PO4)3; NA3CR2(PO4)3;
D O I：
10.1016/j.molstruc.2009.07.035
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The phase transition properties of A(3)Fe(2)(PO4)(3) (A = Li, Na) were studied by Raman spectroscopy. Several Raman bands change continuously in 25-400 degrees C temperature range, indicating a phase transition from the gamma, beta to the alpha-phase occurring at this range of temperature. Bands caused by vibrations of phosphate anion and different ions have been found. The spectra analysis reveals that the modes, located at low frequency range 100-400 cm(-1), near 500 cm(-1) at room temperature, are the most thermo-sensitive. In addition, the modes corresponding to bond valence stretching of (PO4) unit in the frequency region 970-1200 cm(-1) show also evolution with temperature but less sensitive than the above ones. It is observed that phosphate groups show some ordering with temperature. According to our Raman study, we can state that each of the compounds LiFeP and NaFeP shows two reversible phase transformations in the temperature range studied. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：147 / 155
页数：9
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