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Isotopes in Neutron Diffraction – Detailed Structural Analysis at the Metal-Insulator Transition in SmNiO3

Published online by Cambridge University Press:  18 March 2011

Mark T. Weller ,
Paul F. Henry  and
C.C. Wilson
Mark T. Weller
Affiliation:
ISIS, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon., OX11 0QX, UK
Paul F. Henry
Affiliation:
ISIS, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon., OX11 0QX, UK
C.C. Wilson
Affiliation:
Department of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
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Abstract

The use of isotopically enriched materials on high intensity neutron powder diffractometers allows the derivation of much higher quality structural information than has hitherto been possible. The technique can be applied to materials such as ferroelectrics, superconductors and oxides exhibiting colossal magneto-resistance, where small structural changes associated with phase transitions need to be characterised. Three isotopically pure samples of samarium nickelate have been studied around the metal-insulator transition at 403 K. Simultaneous multi-histogram refinements permit extraction of very high quality structural information that shows smooth variations in bond lengths and angles with all nickel oxygen distances decreasing as the electrons localise.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG3.31
Copyright
Copyright © Materials Research Society 2001

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