ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
A crystal of (Sr1.5Ca1.5)Cu5 + δOy has been studied by means of electron diffraction analysis and high-resolution transmission electron microscopy. A chimney ladder structure has been identified in the crystal, which is composed of two sets of incommensurate orthorhombic sublattices L1 and L2 with a = a1 = a2 = 1.28, b = b1 = b2 = 1.13, c1 = 0.390 and c2 = 0.275 nm. Diffraction streaks have been observed in electron diffraction patterns, i.e. there is a set of reflection planes parallel to a*b* related to L2. A structure model with initial phase disorder has been proposed to explain such diffraction streaks. A mathematical inference as well as an optical diffraction method have confirmed this model. Observed high-resolution images together with calculated ones gave a direct verification for the initial phase disorder.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108767391006591
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