Abstract
The room temperature structure of Bi0.75Sr0.25MnO3 has been fitted to high-resolution synchrotron X-ray and time-of-flight neutron powder diffraction data. Constrained structural models were refined using a (1/2 00) Pn11 supercell (a = 11.0286(2) angstrom, b = 7.7351 (1) angstrom, c = 5.53419(9) angstrom, and alpha = 89.894( 1)degrees) of the underlying Pinna perovskite structure. The best-fit model evidences a 3:1 Mn3+/ Mn4+ charge ordering with only 30% of the ideal separation of bond valence sums. An ordered intergrowth of antiferro-orbitally ordered (LaMnO3 type) and charge and ferro-orbitally ordered (YBaMn2O6 type) blocks is observed. Off-centre Bi/Sr displacements are ferroelectrically ordered in this model. (C) 2006 Elsevier Inc. All rights reserved.
Original language | English |
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Pages (from-to) | 1369-1374 |
Number of pages | 6 |
Journal | Journal of Solid State Chemistry |
Volume | 179 |
Issue number | 5 |
DOIs | |
Publication status | Published - May 2006 |
Keywords / Materials (for Non-textual outputs)
- charge order
- orbital order
- manganite perovskites
- X-ray diffraction
- neutron diffraction
- ROOM-TEMPERATURE
- COLOSSAL MAGNETORESISTANCE
- PEROVSKITE
- MANGANITES
- BI0.5SR0.5MNO3
- BI1-XSRXMNO3
- STRIPES
- BIMNO3
- CA