Ternary rare-earth alumo-silicides-single-crystal growth from Al flux, structural and physical properties
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716 (United States)
- MST-10, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
- Department of Physics, University of California, Davis, CA 95616 (United States)
A number of rare-earth alumo-silicides (R-Al-Si) have been synthesized from the corresponding elements by high-temperature reactions, carried out in excess of aluminum to serve as a flux. Under these experimental conditions, large single crystals of all R-Al-Si ternary phases were readily produced. The crystal structures these ternaries adopt were studied by means of powder and single-crystal X-ray diffraction and were classified as follows: (1) the early rare-earths (R=La, Ce, Pr, Nd, Sm, Gd) yield RAl{sub x}Si{sub 2-x}, x{approx}1, non-stoichiometric ternary derivatives of the body-centered {alpha}-ThSi{sub 2}-type; (2) the late rare-earths (R=Tb, Dy, Ho, Er, Tm) form stoichiometric R{sub 2}Al{sub 3}Si{sub 2} compounds that crystallize in the C-centered monoclinic Y{sub 2}Al{sub 3}Si{sub 2}-type; (3) the divalent Eu and Yb produce EuAl{sub 2}Si{sub 2} and YbAl{sub 2}Si{sub 2} with the trigonal CaAl{sub 2}Si{sub 2}-type, whereas the last lanthanide element, Lu, forms LuAlSi with C-centered orthorhombic YAlGe-type. These structural trends are reviewed, and the evolution of the basic physical properties such as magnetism, heat capacity and electrical resistivity when moving across the series is described in detail.
- OSTI ID:
- 20726001
- Journal Information:
- Journal of Solid State Chemistry, Vol. 178, Issue 6; Other Information: DOI: 10.1016/j.jssc.2005.04.021; PII: S0022-4596(05)00174-X; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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