INCOMMENSURATE MODERATED DISORDER IN BA0.85CA2.15IN6O12

Citation
G. Baldinozzi et al., INCOMMENSURATE MODERATED DISORDER IN BA0.85CA2.15IN6O12, Acta crystallographica. Section B, Structural science, 52, 1996, pp. 780-789
Citations number
14
Categorie Soggetti
Crystallography
ISSN journal
01087681
Volume
52
Year of publication
1996
Part
5
Pages
780 - 789
Database
ISI
SICI code
0108-7681(1996)52:<780:IMDIB>2.0.ZU;2-B
Abstract
The tunnel structure of the oxide Ba0.85Ca2.15In6O12 has been revisite d. A mono-incommensurate modulation has been evidenced by electron dif fraction. The simultaneous refinement of X-ray and neutron powder diff raction patterns has allowed a complete determination of the incommens urate structure [P3(1/3 1/3 gamma)]. The existence of a modulated diso rder, affecting Ba and Ca atoms, has been pointed out. The occupancy m odulation concerning Ba and Ca atoms located on the hexagonal tunnel a xis induces a modulation of the Ba-O bond lengths. The high-resolution electron microscopy study has shown the existence of twinning domains and of crystal regions possessing a defective arrangement of the modu lation.