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Determination of the Site Occupancy of Holmium in SrTiO3 by Alchemi

Published online by Cambridge University Press:  02 July 2020

S. C. Cheng ,
A. Hitomi  and
C. A. Randall
S. C. Cheng
Affiliation:
Materials Characterization Laboratory The Pennsylvania State University, University Park, PA, 16802USA
A. Hitomi
Affiliation:
Materials Research Laboratory The Pennsylvania State University, University Park, PA, 16802USA
C. A. Randall
Affiliation:
Materials Research Laboratory The Pennsylvania State University, University Park, PA, 16802USA
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Extract

The perovskite structure is based upon the mineral CaTiO3, which is a pseadocubic at room temperature. The ideal structure has a twelve fold coordinate A-site, and an octahedral coordinated B-site, and the face-centered position being oxygen. The perovskites have been of commercial interest for capacitors owing to their high dielectric constants. The crystal chemistry related to the perovskite based dielectrics multilayer capacitors (MLCs) is of interest in this paper. The MLCs with base metal internal electrodes such as copper and nickel have been studied for many years. To avoid oxidation of the nickel or copper electrodes during sintering, a reducing atmosphere is necessary. However, reduced firing causes two basic problems: an increasing of conductivity of the BaTiO3, dielectrics and limitation on reliability by the migration of oxygen vacancies. The solution for the first problem is to use acceptor dopants, such as MnO and more stable oxide additives, such as CaZrO3 to increase the resistivity of the dielectrics.

Type
Microscopy of Ceramics and Minerals
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 582 - 583
Copyright
Copyright © Microscopy Society of America

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References

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