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Eels Study of Valence State and Oxygen Vacancies In Magnetoresistive Oxides

Published online by Cambridge University Press:  02 July 2020

Z.L. Wang  and
J.S. Yin
Z.L. Wang
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332
J.S. Yin
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332
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Extract

Colossal magnetoresistive (CMR) has been observed in a class of oxides, La1-xAxMnO3 (A = Ca, Sr, or Ba). Transition and rare earth metal elements with mixed valences are usually present in these materials for stimulating structural and chemical evolutions, leading to specific functionality. The partial substitution of trivalent La3+ by divalent element A2+ is balanced by the conversion of Mn valence states between Mn3+ and Mn4+ and the creation of oxygen vacancies as well, since the ionic structure of La1-xAxMnO3-y is proposed to be

in which the valence conversion is the key for determining the material's properties. In practice, quantifying of oxygen vacancies is a challenge to existing microscopy techniques particularly for thin film specimens because of the strong effect from the defects at the substrate-film interface and the surface disordering.

Type
Analytical Electron Microscopy
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 955 - 956
Copyright
Copyright © Microscopy Society of America 1997

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References

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