Microstructural defects in some rare earth laves phase single crystals

Journal Article · Sun Aug 15 00:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90162-L· OSTI ID:6354195

Bi, Y J; Abell, J S ^[1]

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1. Univ. of Birmingham, Birmingham (United Kingdom). School of Metallurgy and Materials.

With the extensive research in magnetic behavior of rare earth intermetallic compounds, more specific microstructural characterization on the available single crystals is obviously necessary because many interpretations of the physical property measurements can be particularly dependent on the knowledge of the microstructural defects, impurity distributions, etc. Among the more interesting and also the most extensively investigated rare earth intermetallics are RAl[sub 2](R = rare earth elements) compounds, which have the C15 cubic Laves phase structure with the tetrahedra of smaller Al atoms residing at the four corners of the cubic cell. While much effort has been devoted to understanding the nature of the magnetism of RAl[sub 2] single crystals by neutron diffraction, e.g. heat capacity measurements, x-ray topography, etc., little work has been performed on characterization of microstructural defects and their effects on physical property measurements. In this work, the authors report a microstructural study on as-grown single crystals of CeAl[sub 2] and TbAl[sub 2] by transmission electron microscopy (TEM). The presence of (001) growth faults in CeAl[sub 2] single crystals and (111) planar defects in TbAl[sub 2] single crystals have been identified, and the possible formation mechanism and the influence on the magnetic properties are discussed.

• OSTI ID: 6354195
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 29:4; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MAGNETIC PROPERTIES
MICROSTRUCTURE
CERIUM ALLOYS
TERBIUM ALLOYS
BINARY ALLOY SYSTEMS
CRYSTAL DEFECTS
EXPERIMENTAL DATA
INTERMETALLIC COMPOUNDS
LAVES PHASES
MONOCRYSTALS
TRANSMISSION ELECTRON MICROSCOPY
ALLOY SYSTEMS
ALLOYS
CRYSTAL STRUCTURE
CRYSTALS
DATA
ELECTRON MICROSCOPY
INFORMATION
MICROSCOPY
NUMERICAL DATA
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties