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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.

Thermal Lattice Parameters Variation of CaCuxMn7-xO12Compounds with Trigonal Crystal Structure

Thermal Lattice Parameters Variation of CaCu_xMn_7-xO₁₂Compounds with Trigonal Crystal Structure