Acta Crystallographica Section B

Volume 65, Part 5 (October 2009)

research papers

 

Modulation of atomic positions in CaCu_xMn_7-xO₁₂ (x 0.1)

W. Slawinski, R. Przenioslo, I. Sosnowska, M. Bieringer, I. Margiolaki and E. Suard

Abstract: The modulation of atomic positions in CaCu_xMn_7-xO₁₂ (x = 0 and 0.1) was studied using synchrotron radiation powder diffraction below 250 and 220 K, respectively. The copper-rich member CaCu_xMn_7-xO₁₂ (x = 0.23) does not show any modulation of the atomic positions at temperatures as low as 10 K. Using low-temperature neutron powder diffraction the modulation of the magnetic moments of Mn ions in CaCu_xMn_7-xO₁₂ (x = 0, 0.1 and 0.23) has been investigated. Long-range modulated magnetic ordering in CaCu_xMn_7-xO₁₂ (x = 0, 0.1 and 0.23) is observed below 90.4, 89.2 and 78.1 K. (0,0,q_p) and (0,0,q_m) are the propagation vectors describing the modulations of the atomic positions and the magnetic moments. For CaCu_xMn_7-xO₁₂ (x = 0 and 0.1) the magnetic modulation and atomic modulation lengths are related by a factor of 2 satisfying the relation (1 - q_p) = 2(1 - q_m).

Keywords: modulation; synchrotron powder diffraction; magnetic moments.

	Rietveld powder data file (CIF format) (1671.6 kbytes) [ doi:10.1107/S0108768109025300/sn5079t010sup2.rtv ] Contains datablock t010
	Rietveld powder data file (CIF format) (3342.8 kbytes) [ doi:10.1107/S0108768109025300/sn5079t020sup3.rtv ] Contains datablock t020
	Rietveld powder data file (CIF format) (3342.9 kbytes) [ doi:10.1107/S0108768109025300/sn5079t030sup4.rtv ] Contains datablock t030
	Rietveld powder data file (CIF format) (3342.9 kbytes) [ doi:10.1107/S0108768109025300/sn5079t045sup5.rtv ] Contains datablock t045
	Rietveld powder data file (CIF format) (3342.9 kbytes) [ doi:10.1107/S0108768109025300/sn5079t050sup6.rtv ] Contains datablock t050
	Rietveld powder data file (CIF format) (3343.0 kbytes) [ doi:10.1107/S0108768109025300/sn5079t070sup7.rtv ] Contains datablock t070
	Rietveld powder data file (CIF format) (3343.0 kbytes) [ doi:10.1107/S0108768109025300/sn5079t090sup8.rtv ] Contains datablock t090
	Rietveld powder data file (CIF format) (1671.6 kbytes) [ doi:10.1107/S0108768109025300/sn5079t100sup9.rtv ] Contains datablock t100
	Rietveld powder data file (CIF format) (3342.9 kbytes) [ doi:10.1107/S0108768109025300/sn5079t150sup10.rtv ] Contains datablock t150
	Rietveld powder data file (CIF format) (3342.9 kbytes) [ doi:10.1107/S0108768109025300/sn5079t180sup11.rtv ] Contains datablock t180
	Rietveld powder data file (CIF format) (3342.9 kbytes) [ doi:10.1107/S0108768109025300/sn5079t210sup12.rtv ] Contains datablock t210
	Rietveld powder data file (CIF format) (3343.0 kbytes) [ doi:10.1107/S0108768109025300/sn5079t250sup13.rtv ] Contains datablock t250
	Rietveld powder data file (CIF format) (3340.6 kbytes) [ doi:10.1107/S0108768109025300/sn5079t293sup14.rtv ] Contains datablock t293

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