ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
We have investigated the modulated structure of the misfit-layered crystal Bi1.8Sr2.0Rh1.6Ox bymeans of electron diffraction and high-resolution electron microscopy. This compound consists of twointerpenetrating subsystems of a hexagonal RhO2 sheet and a distorted four-layered rock-salt-type(Bi,Sr)O block. Both subsystems have common a-, c-axes and β-angles with a = 5.28 Å, c = 29.77 Å andβ = 93.7º. On the other hand, the crystal structure is incommensurated parallel to the b-axes, among whichb1 = 3.07 Å for the RhO2 sheet and b2 = 4.88 Å for the (Bi,Sr)O block. The misfit ratio, b1/b2 ~ 0.63,characterizes the structural analogue as [Bi1.79Sr1.98Oy]0.63[RhO2]. This compound has two modulationvectors, i.e., q1 = – a* + 0.63b1* and q2 = 0.17b1* + c*, and the superspace group is assigned as the Cc(1β0,0μ1)-type from the electron diffraction patterns. High-resolution images taken with the incident electronbeam parallel to the a- and c-axes clearly show displacive as well as compositional modulations
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.818.pdf
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