In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 44, No. 12R ( 2005-12-01), p. 8557-
Abstract:
We have studied the crystal structure of the misfit-layered crystal Bi 1.91 Sr 2 Rh 1.77 O x by electron diffraction and high-resolution electron microscopy. This compound consists of two interpenetrating subsystems of a RhO 2 sheet and a distorted four-layered rock-salt-type (Bi,Sr)O block. Both subsystems have common a -axes, c -axes, and β-angles with a =5.28 Å, c =29.77 Å, and β=93.7°. On the other hand, the crystal structure is incommensurated parallel to the b -axis, b 1 =3.07 Å for the RhO 2 sheet and b 2 =4.88 Å for the (Bi,Sr)O block. The axis ratio, b 1 / b 2 ∼0.63, characterizes the structural analogue as [Bi 1.79 Sr 1.98 O y ] 0.63 [RhO 2 ]. This compound has two modulation vectors, q 1 =a * +0.63b 1 * and q 2 =0.17b 1 * +c * , and the superspace group is assigned as the C c (1β0,0µ1) type from electron diffraction patterns. High-resolution images taken with the incident electron beam parallel to the a - and c -axes clearly exhibit modulated displacive as well as compositional atomic arrangements. A tentative structure model has been proposed, and the calculated image reproduces observed characteristic features reasonably well.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.44.8557
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2005
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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