Synchrotron x-ray topography studies of twin structures in lanthanum aluminate single crystals

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Journal of Materials Research; (United States)

DOI:https://doi.org/10.1557/JMR.1992.1847· OSTI ID:7068296

Yao, G; Hou, S Y; Dudley, M ^[1]; Phillips, J M ^[2]

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1. Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794-2275 (United States)
2. AT T Bell Laboratories, Murray Hill, New Jersey 07974 (United States)

An extensive investigation of twin structures in lanthanum aluminate single crystals at room temperature has been undertaken using White Beam Synchrotron X-ray Topography (WBSXRT). Twin configurations, directly observable via orientation contrast, were found to comprise both large-volume, macroscopic twins and thick twin lamellae. Positional shifts of twin domain images with respect to matrix images, arising from the mutual misorientation of diffraction vectors, were measured on x-ray topographic images recorded from the (220){sub rhom} planes approximately parallel to the specimen surface and compared to calculated values in order to solve the twin laws in this system. The dominant twin operations were found to be (101){sub rhom}, (011){sub rhom}, and (112){sub rhom} mirror reflections. The potential influence of the twins on the growth of epitaxial Ba{sub 2}YCu{sub 3}O{sub 7{minus}{delta}} thin films is discussed.

• DOE Contract Number: FG02-84ER45098
• OSTI ID: 7068296
• Journal Information: Journal of Materials Research; (United States), Journal Name: Journal of Materials Research; (United States) Vol. 7:7; ISSN JMREE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINATES
ALUMINIUM COMPOUNDS
BREMSSTRAHLUNG
CRYSTALS
ELECTROMAGNETIC RADIATION
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
MONOCRYSTALS
OXYGEN COMPOUNDS
RADIATIONS
RARE EARTH COMPOUNDS
SUBSTRATES
SUPERCONDUCTORS
SYNCHROTRON RADIATION
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TWINNING