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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Jahn, Sandro / Tiekink, E. R. T.

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Volume 209, Issue 9

Issues

Crystal chemistry of non-stoichiometric Mg–Al synthetic spinels

S. Lucchesi / A. Della Giusta
Published Online: 2010-07-28 | DOI: https://doi.org/10.1524/zkri.1994.209.9.714

Abstract

Twenty-seven single-crystal structural refinements were performed on synthetic spinels along the MgAl2O4 – Al8/31/3O4 join. The number of vacancies (from 0.09 to 0.22) was determined according to microprobe analysis. Results indicate that vacancies are limited only to octahedral sites, with a vacancy-to-oxygen distance refined to 2.113(3) Å. Mg is ordered in the tetrahedral site, and only for a0 > 7.99 Å are the amounts of octahedral Mg significant. The decrease in a0 shown by Al8/31/3O4-rich terms is essentially related to the strong decrease in the T–O distance, due to large amounts of tetrahedral Al. A linear relation between a0 and the vacancy content V[unk] was derived satisfactorily fitting data in the literature, including end-members.

About the article

Published Online: 2010-07-28

Published in Print: 1994-09-01


Citation Information: Zeitschrift für Kristallographie - Crystalline Materials, Volume 209, Issue 9, Pages 714–719, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1524/zkri.1994.209.9.714.

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