Temperature induced structural phase transition in Sr3-xCaxFe2TeO9 (0 ≤ x ≤ 1) probed by Raman and Mossbauer techniques

被引：12
作者：
El Hachmi, Abdelhadi [1 ]
Manoun, Bouchaib [1 ,2 ]
Tamraoui, Y. [1 ,2 ]
Mirinioui, F. [1 ]
Abkar, R. [1 ]
El Aamrani, M. A. [1 ]
Saadoune, I. [2 ,3 ]
Sajieddine, M. [4 ]
Lazor, P. [5 ]
机构：
[1] Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco
[2] Mohammed VI Polytech Univ, Mat Sci & Nanoengn Dept, Ben Guerir, Morocco
[3] Univ Cadi Ayyad, FST Marrakech, LCME, Av A Khattabi, Marrakech 40000, Morocco
[4] Univ Sultan Moulay Sliman, Lab Phys & Mech Mat, Fac Sci & Tech, BP 523, Beni Mellal 23000, Morocco
[5] Uppsala Univ, Dept Earth Sci, SE-75236 Uppsala, Sweden
来源：
JOURNAL OF MOLECULAR STRUCTURE | 2017年 / 1141卷
基金：
瑞典研究理事会;
关键词：
Double perovskite; Crystal structure; Phase transition; X-ray diffraction; Raman spectroscopy; Mossbauer spectroscopy; DOUBLE PEROVSKITE; HIGH-PRESSURE; MAGNETIC-STRUCTURE; CRYSTAL-STRUCTURE; ROOM-TEMPERATURE; SR3FE2TEO9;
D O I：
10.1016/j.molstruc.2017.03.118
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：
A series of perovskites Sr3-xCaxFe2TeO9 (0 <= x <= 1) have been prepared in polycrystalline form by solid-state reaction method in air. These materials have been studied by X-ray powder diffraction method (XRPD) and Raman spectroscopy. An analysis of the XRD patterns at room temperature has shown that these compounds crystallize in a tetragonal system, space group I4/m. The structure contains alternating (Fe/Te)(2a)O-6 and (Fe/Te)(2b)O-6 octahedra, tilted in anti-phase in the basal ab-plane. The study of Raman spectroscopy at various temperatures shows a transition from tetragonal to cubic phase: I4/m -> Fm (3) over bar m. This phase transition occurs at high-temperature. Analysis of Raman spectra recorded at several temperatures shows that this phase transition appears near similar to 375 degrees C for (x = 0), similar to 435 degrees C for (x = 0.5) and similar to 451 degrees C for (x = 1). A proportional and gradual increase of temperature phase transition is observed as function of the calcium amount. (C) 2017 Elsevier B.V. All rights reserved.
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收藏
页码：484 / 494
页数：11
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