Thermal Lattice Parameters Variation, of CaCuxMn7-xO12 Compounds with Trigonal Crystal Structure
W. Sławiński a, R. Przeniosło a, I. Sosnowska a, M. Bieringer b and I. Margiolaki c
a Institute of Experimental Physics, University of Warsaw, Hoża 69, PL-00-681 Warsaw, Poland
b Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 Canada
c European Synchrotron Radiation Facility, BP220, Grenoble Cedex, F-38043, France
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Received: 3 06 2007;
We report the crystal structure evolution of CaCu0.2Mn6.8O12 as a function of temperature between 10 K and 290 K. The analysis of the diffraction data is carried out with the Rietveld method applied to the average trigonal structure of CaCu0.2Mn6.8O12. The x = 0.2 member shows similar low temperature extrema for the unit cell parameter evolution as the previously reported x = 0.1 and x = 0 members of the CaCuxMn7-xO12 system. All magnetic and crystallographic transition temperatures indicated by the unit cell parameter evolution obtained by powder X-ray diffraction methods systematically decrease with increasing Cu content, x.
DOI: 10.12693/APhysPolA.113.1225
PACS numbers: 61.05.C-, 65.40.De