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Structural chemistry and magnetic properties of Y2CoGe4O12

Liu, Xiao-Qiang, Battle, Peter D., Ridout, Joe, Xu, Diming, Ramos, Silvia (2015) Structural chemistry and magnetic properties of Y2CoGe4O12. Journal of Solid State Chemistry, 228 . pp. 183-188. ISSN 0022-4596. (doi:10.1016/j.jssc.2015.04.033) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:60117)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://doi.org/10.1016/j.jssc.2015.04.033

Abstract

Polycrystalline Y2CoGe4O12 has been prepared by standard ceramic methods. The crystal structure (space group P4/nbm; a=9.8465(2), c=4.92986(9) Å) consists of metal-rich layers separated from each other by Ge4O12 groups comprised of four corner-sharing GeO4 tetrahedra. Two cation sites lie within the layers; an eight-coordinate site occupied by yttrium and a six-coordinate site occupied by a 1:1 disordered distribution of yttrium and cobalt. Neutron diffraction revealed two-fold disorder on the oxide sublattice; this has been elucidated using Co K-edge EXAFS spectroscopy. The availability of two sites allows each oxide ion to accommodate the coordination preferences of its single Co/Y neighbour; the GeO4 tetrahedra distort to absorb any consequent strain. The octahedron of anions around each Co2+ cation shows a pseudo-tetragonal distortion with a strain (Co–O)eq–(Co–O)ax/(Co–O)eq=?0.173. This results in an unusually large effective magnetic moment of 6.05 µB per Co2+ cation.

Item Type: Article
DOI/Identification number: 10.1016/j.jssc.2015.04.033
Uncontrolled keywords: Physics of Quantum Materials
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Silvia Ramos Perez
Date Deposited: 26 Jan 2017 16:38 UTC
Last Modified: 06 May 2020 03:15 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/60117 (The current URI for this page, for reference purposes)
Ramos, Silvia: https://orcid.org/0000-0003-2725-7706
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