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Synthesis, crystal structure, and vibrational studies of the monoclinically distorted double perovskite, Sr2Mn1−xNixTeO6 with (x = 0.25, 0.5, and 0.75)

Published online by Cambridge University Press:  22 May 2019

A. Zaraq ,
B. Orayech ,
J. M. Igartua  and
A. El Bouari
A. Zaraq*
Affiliation:
Laboratoire de Physico-Chimie des Matériaux Appliqués (LPCMA), Université Hassan II de Casablanca, Faculté des Sciences Ben M'sik, Avenue Idriss El harti, B.P. 7955, Casablanca, Morocco
B. Orayech
Affiliation:
Maxam, Technology Center Energetic Materials, Carretera N-623 km 28. 09141 Quintanilla Sobresierra. Burgos, Spain
J. M. Igartua
Affiliation:
Fisika Aplikatua II Saila, Zientzia eta Teknologia Fakultatea, Euskal Herriko Unibertsitatea, P.O.Box 644, Bilbao 48080, Spain
A. El Bouari
Affiliation:
Laboratoire de Physico-Chimie des Matériaux Appliqués (LPCMA), Université Hassan II de Casablanca, Faculté des Sciences Ben M'sik, Avenue Idriss El harti, B.P. 7955, Casablanca, Morocco
*
a)Author to whom correspondence should be addressed. Electronic mail: [email protected]
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Abstract

The new double perovskite oxides Sr2Mn1−xNixTeO6 with x = 0.25, 0.5 and 0.75 have been synthesized in polycrystalline form by a conventional solid-state reactions process at 1180 °C, in the air. The structural and vibrational properties of these materials were studied by means XRPD, Raman, and IR spectroscopy. It has been proven that all the materials show typical double perovskite structures with a monoclinic symmetry, but with two different space group, P21/n for the compositions (x = 0.25 and 0.5), while the composition (x = 0.75) crystallizes in the space group I2/m. The lattice parameters obtained are in agreement with those of the two pure extremes Sr2MnTeO6 and Sr2NiTeO6. The monoclinic structural distortion involves long range ordering between Te6+ (in 2b site) and a random mixture (Mn2+/Ni2+) (in 2a site) for the two compositions (x = 0.25 and 0.5) that crystallize in P21/n. For the material (x = 0.75) with I2/m, similar distortion, ordering and mixing occur at the B and B’ double perovskite sites. It was observed that Vegard Law is satisfied, taking into account the cell parameters of both extremes. The effect of the partial substitution of Mn by Ni was also seen in Raman and IR data where a significant mode shift was observed with nickel content increase.

Keywords

Sr2Mn1−xNixTeO6 double perovskites oxidesX-ray diffractionRietveld refinementsRaman spectroscopyinfrared spectroscopycrystal structure
Type
Technical Articles
Information
Powder Diffraction , Volume 34 , Supplement S1 , September 2019 , pp. S48 - S58
Copyright
Copyright © International Centre for Diffraction Data 2019 

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