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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Huppertz, Hubert / Petrícek, Václav / Tiekink, E. R. T.

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IMPACT FACTOR 2016: 3.179

CiteScore 2016: 3.30

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Source Normalized Impact per Paper (SNIP) 2016: 2.592

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2196-7105
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Crystal structure and optical properties of the new 8O polytype of Ca2Ta2O7

Stefan G. Ebbinghaus / Andreas Kalytta / Jürgen Kopf / Anke Weidenkaff / Armin Reller
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/zkri.220.2.269.59112

Abstract

Single crystals of the new 8O modification of Ca2Ta2O7 were grown by optical floating zone melting and their structure was solved by X-ray diffraction. 8O Ca2Ta2O7 crystallizes in space group C2221 with a = 7.3690(2) Å, b = 12.7296(3) Å, c = 48.263(1) Å. The structure is related to the weberite structure type and can be described as a stacking of 8 basic building units per unit cell. Each building unit consists of one Ta3Ca and one Ca3Ta layer with a cubic close packed arrangement. Transmission measurements in the UV-Vis and IR region reveal a high transparency in a wide energy range from 0.2–3.5 eV. Dielectric measurements yield a high ɛ′ value of 60 at room temperature.

About the article

Published Online: 2009-09-25

Published in Print: 2005-03-01


Citation Information: Zeitschrift für Kristallographie - Crystalline Materials, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1524/zkri.220.2.269.59112.

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© 2005 Oldenbourg Wissenschaftsverlag GmbH. Copyright Clearance Center

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[2]
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Stefan G. Ebbinghaus, Rosiana Aguiar, Anke Weidenkaff, Stefan Gsell, and Armin Reller
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