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High-pressure modifications of CaZn{sub 2}, SrZn{sub 2}, SrAl{sub 2}, and BaAl{sub 2}: Implications for Laves phase structural trends

Journal Article · · Journal of Solid State Chemistry
 [1]; ; ;  [1];  [2];  [1]
  1. Department of Chemistry and Biochemistry, Arizona State University, P.O. Box 871604 Tempe, AZ 85287-1604 (United States)
  2. Structural Chemistry, Stockholm University, 10691 Stockholm (Sweden)
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High-pressure forms of intermetallic compounds with the composition CaZn{sub 2}, SrZn{sub 2}, SrAl{sub 2}, and BaAl{sub 2} were synthesized from CeCu{sub 2}-type precursors (CaZn{sub 2}, SrZn{sub 2}, SrAl{sub 2}) and Ba{sub 21}Al{sub 40} by multi-anvil techniques and investigated by X-ray powder diffraction (SrAl{sub 2} and BaAl{sub 2}), X-ray single-crystal diffraction (CaZn{sub 2}), and electron microscopy (SrZn{sub 2}). Their structures correspond to that of Laves phases. Whereas the dialuminides crystallize in the cubic MgCu{sub 2} (C15) structure, the dizincides adopt the hexagonal MgZn{sub 2} (C14) structure. This trend is in agreement with the structural relationship displayed by sp bonded Laves phase systems at ambient conditions. - Graphical abstract: CeCu{sub 2}-type polar intermetallics can be transformed to Laves phases upon simultaneous application of pressure and temperature. The observed structures are controlled by the valence electron concentration.
OSTI ID:
21212097
Journal Information:
Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 11 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALUMINIUM ALLOYS
BARIUM ALLOYS
CALCIUM ALLOYS
ELECTRON MICROSCOPY
INTERMETALLIC COMPOUNDS
LAVES PHASES
MONOCRYSTALS
PRECURSOR
STRONTIUM ALLOYS
X-RAY DIFFRACTION
ZINC ALLOYS