Abstract
Members of the series Ba2M2-xCuxO 4+δ (M = In, x = 0.5, 1; M = Sc, x = 1) have been synthesized by solid-state reaction methods and characterised by powder neutron diffraction. Selected compositions were annealed under oxygen at 1 atm and 160 atm. The evolution of the structure with oxygen stoichiometry δ was studied. The materials form 'doubled perovskite' phases, A2BB′O 6-x crystallising in tetragonal space group P4/mmm. The structures essentially consist of two ABO3-x cubes stacked along the c axis in which the B cations are ordered on two crystallographically different sites. The divalent Ba cation is on average nine-coordinate and the trivalent M cation octahedrally coordinated to oxygen. The copper oxidation state and coordination varies with the oxygen level of the structure.
Original language | English |
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Pages (from-to) | 921-929 |
Number of pages | 9 |
Journal | Journal of Materials Chemistry |
Volume | 4 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jan 1 1994 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Materials Chemistry