NDLI: Structural phase transitions and magnetic and spectroscopic properties of the double perovskites $Sr_{2}Co_{1−x}Mg_{x}TeO

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rojo, T. Orayech, B. Ortega-san-martín, L. Arriortua, María I. Urcelay-olabarria, I. Igartua, J. M. Lezama, L.
Description	Author Affiliation: Orayech B ( Departamento de Física de la Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, P.O. Box 644, Bilbao 48080, Spain. brahim.orayech@ehu.es.)
Abstract	The structural and magnetic properties of a series of ordered double perovskites with the formula $Sr_{2}Co_{1−x}Mg_{x}TeO_{6}$ (x = 0.1, 0.2 and 0.5) are investigated by X-ray diffraction, low temperature neutron diffraction, electron paramagnetic resonance and magnetic susceptibility. The progressive substitution of the paramagnetic $Co^{2+}$ high spin ion by the diamagnetic $Mg^{2+},$ of about the same size, induces changes in the room temperature crystal structure, from a distorted $P2_{1}/n$ phase for the undoped $Sr_{2}CoTeO_{6}$ oxide to the I4/m of the end member $(Sr_{2}MgTeO_{6}).$ These perovskites experience structural transitions on heating, the temperature at which the transitions occur being smaller as x increases. The novel approach of mode-crystallography is used for the analysis. All oxides show antiferromagnetic exchange interactions between $Co^{2+}$ ions but the long range antiferromagnetic order is not achieved for the phase with x = 0.5. The low temperature neutron diffraction data have been evaluated using a full symmetry analysis. Results are consistent with an unquenched orbital contribution of a high spin $Co^{2+}$ ion.
ISSN	14779226
Issue Number	30
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-08-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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