Copper(II) silicates and germanates with chain structures I. CaCuGe2O6, a strongly deformed pyroxene*

doi:10.1524/zkri.1986.176.3-4.205

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Zeitschrift für Kristallographie - Crystalline Materials

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Copper(II) silicates and germanates with chain structures I. CaCuGe₂O₆, a strongly deformed pyroxene*

M. Behruzi / K.-H. Breuer / W. Eysel

Published Online: 2010-08-25 | DOI: https://doi.org/10.1524/zkri.1986.176.3-4.205

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Abstract

CaCuGe₂O₆ has an extremely distorted pyroxene structure with P2₁/c, a = 10.198 Å,b = 9.209 Å, c = 5.213 Å, β = 105.73° and Z = 4. The final R-value is R_w = 0.028. The coordination polyhedron of copper is a deformed Jahn-Teller octahedron; Ca has an irregular 7 + 1 coordination. Half of the Ge atoms occupy tetrahedra forming Ge₂O₆ chains which are arranged in layers as typical for pyroxenes. The other half is located in trigonal bipyramids GeO₅ which are linked to layers Ge₄O₁₂. Both layer types alternate along [unk].

About the article

Published Online: 2010-08-25

Published in Print: 1986-10-02

Citation Information: Zeitschrift für Kristallographie - Crystalline Materials, Volume 176, Issue 3-4, Pages 205–217, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1524/zkri.1986.176.3-4.205.

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[5]

Growth and characterization of pure and doped single crystals of CuGeO3

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Discovery of a spin-singlet ground state with an energy gap inCaCuGe2O6

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