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Oxygen Vacancies in Perovskite and Related Structures: Implications for the Lower Mantle

Published online by Cambridge University Press:  01 February 2011

Catherine A. McCammon ,
Ana Isabel Becerro ,
Stefan Lauterbach ,
Ulrich Bläß ,
Stefan Marion ,
Falko Langenhorst ,
Ross J. Angel ,
Peter van Aken  and
Friedrich Seifert
Catherine A. McCammon
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
Ana Isabel Becerro
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
Stefan Lauterbach
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
Ulrich Bläß
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
Stefan Marion
Affiliation:
Centre for Materials Science, University of Oslo, N-0349 Oslo, Norway
Falko Langenhorst
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
Ross J. Angel
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
Peter van Aken
Affiliation:
Institut für Mineralogie, TU Darmstadt, D-64287 Darmstadt, Germany
Friedrich Seifert
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
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Abstract

The oxygen vacancy ordering process and displacive transitions have been characterised in the system CaTiO3-CaFeO2.5 as a function of composition and temperature at atmospheric pressure using X-ray diffraction, Mössbauer spectroscopy, infrared spectroscopy, transmission electron microscopy, electron energy loss spectroscopy, neutron diffraction and electrical conductivity methods. With increasing concentration of vacancies the following sequence is observed: isolated defects → short defect chains → infinite chains in layers. Similar experiments at high pressures and temperatures have been conducted to determine the nature of oxygen vacancies in the lower mantle phases (Mg,Fe)(Si,Al)O3-σ and Ca(Si,Fe)O3-σ perovskite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 718: Symposium D – Perovskite Materials , 2002 , D2.3
Copyright
Copyright © Materials Research Society 2002

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