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.

引用

页码：484 / 494

页数：11

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