Crystal chemistry, structure and magnetic properties of the Cu(Mo x W1− x )O4 solid solution series
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of a crystal as a homogeneous solid formed by a repeating, three-dimensional pattern of a unit cell is in principle no longer applicable, taking the statistical chemical distribution of the substituting ions into account.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 W 1−x )O 4 soli...
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Published in | Philosophical magazine (Abingdon, England) Vol. 88; no. 8; pp. 1235 - 1258 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Abingdon
Taylor & Francis Group
01.03.2008
Taylor and Francis Taylor & Francis |
Subjects | |
Online Access | Get full text |
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Summary: | 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of a crystal as a homogeneous solid formed by a repeating, three-dimensional pattern of a unit cell is in principle no longer applicable, taking the statistical chemical distribution of the substituting ions into account.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
W
1−x
)O
4
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 CuWO
4
, but antiferromagnetically in the isostructural compound CuMoO
4
-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
W
1−x
)O
4
powder samples are characterized with high-resolution synchrotron diffraction, magnetization measurements and neutron diffraction. Cu(Mo
x
W
1−x
)O
4
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. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1478-6435 1478-6443 1478-6433 |
DOI: | 10.1080/14786430802106237 |