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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

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

12 Issues per year

IMPACT FACTOR 2016: 3.179

CiteScore 2017: 2.65

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Volume 216, Issue 4


Ca2Ga2O5: a new high pressure oxogallate

V. Kahlenberg / C. S. J. Shaw
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/zkri.


Single crystals of Ca2Ga2O5 have been synthezised in a piston cylinder apparatus at 1250°C/2.5 GPa from precursors prepared by solid state reactions. The crystal structure has been investigated by X-ray diffraction methods. The compound crystallizes in the orthorhombic space group I2mb (a = 5.3525(1)Å, b = 14.6666(1)Å, c = 5.5651(1)Å, V = 436.88(1)Å3, Z = 4, Dcalc=4.56 g cm-3 and is isotypic with Ca2FeAlO5 (Brownmillerite) and Ca2Al2O5. Basic building units of Ca2Ga2O5 are (1) layers of perovskite type corner connected GaO6-octahedra and (2) sheets comprised of zweier single chains of GaO4-tetrahedra. The alternate stacking of the two building units results in a threedimensional framework in which the calcium cations are incorporated for charge compensation. Dicalcium gallate is the first structurally characterized representative of a double oxide in the system CaO - Ga2O3showing a sixfold coordination of Ga3+.

About the article

Published Online: 2009-09-25

Published in Print: 2001-04-01

Citation Information: Zeitschrift für Kristallographie - Crystalline Materials, Volume 216, Issue 4, Pages 206–209, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1524/zkri.

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