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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

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2196-7105
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Volume 216, Issue 4 (Apr 2001)

Issues

Incommensurately modulated Nowotny Chimney-ladder phases: Cr1-xMoxGe∼1.75 with x = 0.65 and 0.84

F. E. Rohrer / H. Lind / L. Eriksson / A.-K. Larsson / S. Lidin
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/zkri.216.4.190.23255

Abstract

The crystal structures of two new ternary, incommensurately modulated phases in the Cr/Mo/Ge system, Cr1-xMoxGe∼1.75 with x = 0.65 and 0.84, have been refined using the same composite approach as for the earlier reported compounds, (Mo/Rh)11Ge18 and (Mo/Rh)13Ge22, from the Mo/Rh/Ge system. The composite model consists of a rather stable diamond-like transition metal substructure and a helical main group element arrangement. The same super space group pair, W:P4/nnc: q1̅q1 P:I41/amd: 11̅ss, the same positions and modulation waves were used. The refinements of the new phases in the Cr/Mo/Ge system converged rapidly to R-values below 5% with GOF of 2.53 and 3.71, respectively. Each structure is built by two sub lattices with the parameters - a, cx and the modulation vector qx - for Ge and a, cT and qT for the transition metals. The refined data for x = 0.65 are found to be a = 5.935(2), cx = 2.770(1), cT = 4.839(1), qx = 0.428 [001]*, qT = 0.253 [001]* and for x = 0.84, a = 5.963(1), cx = 2.786(1), cT = 4.875(1), qx = 0.430 [001]*, qT = 0.264 [001]*. It is clearly shown the composite approach is applicable to different chimney-ladder compounds, even though they have quite different compositions and hence q-vectors.

About the article

Published Online: 2009-09-25

Published in Print: 2001-04-01


Citation Information: Zeitschrift für Kristallographie - Crystalline Materials, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1524/zkri.216.4.190.23255.

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© 2001 Oldenbourg Wissenschaftsverlag GmbH. Copyright Clearance Center

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