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The Structure of Twin Boundaries in Cluster Compounds: Potassium Barium Oxomolybdate

Published online by Cambridge University Press:  02 July 2020

R. Ramlau ,
R. E. McCarley  and
A. Simon
R. Ramlau
Affiliation:
Max-Planck-Institut für Festkörperforschung, D-70569, Stuttgart, Germany
R. E. McCarley
Affiliation:
Ames Laboratory, U.S.D.O.E., and Iowa State University, Ames, Iowa, 50011
A. Simon
Affiliation:
Max-Planck-Institut für Festkörperforschung, D-70569, Stuttgart, Germany
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Extract

K0.19Ba3.18Mo22O34is a representative of the quaternary reduced molybdenum oxides in the series Mn±δMo4n+2O6n+4. These compounds contain condensed clusters Mo4n+2O8n+10 with a core of n trans edge-sharing molybdenum octahedra. The general concept of cluster condensation is discussed elsewhere. In the case of n being finite the clusters are designated as ‘oligomeric’. The individual clusters are interconnected via common oxygen atoms and arranged in layers. For the title compound with n = 5, the clusters consist of 5 molybdenum octahedra and are accompanied by 4 counter-cations (potassium and barium).

The real structure of K0.19Ba3.81Mo22O34 has been recently studied with a Philips CM30/ST (Cs = 1.15 mm) by HREM, SAED, and EDXS. Besides chemical intergrowth of oligomeric clusters with n = 2—18 in the matrix consisting of pentameric clusters, polytypism was observed. Three ordered polytypes (modifications) were found, whereas only one of them, lM (Ramsdell notation), was detected and analyzed with x-ray methods.

Type
Atomic Structure and Mechanisms at Interfaces in Materials
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. 639 - 640
Copyright
Copyright © Microscopy Society of America 1997

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References

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