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Crystal chemistry, structure and magnetic properties of the Cu(MoxW1-x)O4 solid solution series

Schwarz, B. and Ehrenberg, H. and Weitzel, H. and Senyshyn, A. and Thybusch, Brunhilde and Knapp, M. and McIntyre, G. J. and Fuess, H. (2008):
Crystal chemistry, structure and magnetic properties of the Cu(MoxW1-x)O4 solid solution series.
In: Philosophical Magazine, Taylor & Francis, pp. 1235-1258, 88, (8), [Online-Edition: http://www.informaworld.com/10.1080/14786430802106237],
[Article]

Abstract

For a solid solution series the common description of a crystal as a homogeneous solid formed by a repeating, three-dimensional pattern of a unit cell is in principle no longer applicable, taking the statistical chemical distribution of the substituting ions into account. The Cu(Mo x W1−x )O4 solid solution series represents an appropriate system to investigate how this chemical distribution affects the details of the crystal structure: Due to different coordination preferences of the isovalent diamagnetic ions W and Mo, a decisive magnetic exchange path couples ferromagnetically in CuWO4, but antiferromagnetically in the isostructural compound CuMoO4-III. From the investigations of the magnetic properties of the solid solution series it can be inferred for a certain range of stoichiometries that the Mo/W cation disorder of the solid solution series does not result in a corresponding disordered distribution of magnetic coupling constants but in the formation of a super structure of them. The magnetic superexchange here acts as a very sensitive probe for local bonding geometries. Consequently, in the solid solution cooperative structural processes dominate over individual coordination preferences. In the present work Cu(Mo x W1−x )O4 powder samples are characterized with high-resolution synchrotron diffraction, magnetization measurements and neutron diffraction. Cu(Mo x W1−x )O4 single crystals are characterized by electron probe micro-analysis, transmission electron microscopy, X-ray structure refinement and profile analyses, magnetization measurements and diffraction with ‘white’ and monochromatic neutrons.

Item Type: Article
Erschienen: 2008
Creators: Schwarz, B. and Ehrenberg, H. and Weitzel, H. and Senyshyn, A. and Thybusch, Brunhilde and Knapp, M. and McIntyre, G. J. and Fuess, H.
Title: Crystal chemistry, structure and magnetic properties of the Cu(MoxW1-x)O4 solid solution series
Language: English
Abstract:

For a solid solution series the common description of a crystal as a homogeneous solid formed by a repeating, three-dimensional pattern of a unit cell is in principle no longer applicable, taking the statistical chemical distribution of the substituting ions into account. The Cu(Mo x W1−x )O4 solid solution series represents an appropriate system to investigate how this chemical distribution affects the details of the crystal structure: Due to different coordination preferences of the isovalent diamagnetic ions W and Mo, a decisive magnetic exchange path couples ferromagnetically in CuWO4, but antiferromagnetically in the isostructural compound CuMoO4-III. From the investigations of the magnetic properties of the solid solution series it can be inferred for a certain range of stoichiometries that the Mo/W cation disorder of the solid solution series does not result in a corresponding disordered distribution of magnetic coupling constants but in the formation of a super structure of them. The magnetic superexchange here acts as a very sensitive probe for local bonding geometries. Consequently, in the solid solution cooperative structural processes dominate over individual coordination preferences. In the present work Cu(Mo x W1−x )O4 powder samples are characterized with high-resolution synchrotron diffraction, magnetization measurements and neutron diffraction. Cu(Mo x W1−x )O4 single crystals are characterized by electron probe micro-analysis, transmission electron microscopy, X-ray structure refinement and profile analyses, magnetization measurements and diffraction with ‘white’ and monochromatic neutrons.

Journal or Publication Title: Philosophical Magazine
Volume: 88
Number: 8
Publisher: Taylor & Francis
Uncontrolled Keywords: diffraction; magnetic oxides; magnetic structure; transmission electron microscopy
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Mar 2010 15:52
Official URL: http://www.informaworld.com/10.1080/14786430802106237
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