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2005
Structure
D 2000
08- 007
YBaMnCoO5: Neither Valence Mixed nor Charge Ordered. — The properties of
the title compound are characterized as functions of temperature by neutron thermodiffractometry, electrical conductivity and magnetization measurements, DSC, as well
as neutron and synchrotron X-ray powder diffraction. The compound crystallizes in the
space group P4/mmm. In contrast to YBaFe2O5 the title compound shows neither
long-range order of Mn and Co (charge ordering), nor thermally induced mixing of their
charges into a delocalized state (valence mixing). The title compound is a tetragonal
double-cell perovskite with Y and Ba ordered in layers, and Mn and Co disordered over
a square-pyramidal site. — (KAREN*, P.; SUARD, E.; FAUTH, F.; WOODWARD, P.
M.; Solid State Sci. 6 (2004) 11, 1195-1204; Dep. Chem., Univ. Oslo, N-0315 Oslo,
Norway; Eng.) — W. Pewestorf
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