Schwarz, B. ; Ehrenberg, H. ; Weitzel, H. ; Senyshyn, A. ; Thybusch, Brunhilde ; Knapp, M. ; McIntyre, G. J. ; Fuess, H. (2008)
Crystal chemistry, structure and magnetic properties of the Cu(MoxW1-x)O4 solid solution series.
In: Philosophical Magazine, 88 (8)
Artikel, Bibliographie
Kurzbeschreibung (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of a crystal as a homogeneous solid formed by a repeating, three-dimensional pattern of a unit cell is in principle no longer applicable, taking the statistical chemical distribution of the substituting ions into account.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.
Typ des Eintrags: | Artikel |
---|---|
Erschienen: | 2008 |
Autor(en): | Schwarz, B. ; Ehrenberg, H. ; Weitzel, H. ; Senyshyn, A. ; Thybusch, Brunhilde ; Knapp, M. ; McIntyre, G. J. ; Fuess, H. |
Art des Eintrags: | Bibliographie |
Titel: | Crystal chemistry, structure and magnetic properties of the Cu(MoxW1-x)O4 solid solution series |
Sprache: | Englisch |
Publikationsjahr: | 28 Mai 2008 |
Verlag: | Taylor & Francis |
Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Philosophical Magazine |
Jahrgang/Volume einer Zeitschrift: | 88 |
(Heft-)Nummer: | 8 |
URL / URN: | http://www.informaworld.com/10.1080/14786430802106237 |
Kurzbeschreibung (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. |
Freie Schlagworte: | diffraction; magnetic oxides; magnetic structure; transmission electron microscopy |
Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialanalytik 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
Hinterlegungsdatum: | 17 Mär 2010 15:52 |
Letzte Änderung: | 05 Mär 2013 09:32 |
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