Ternary compounds REAgSb{sub 2}, RE = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm: Magnetism and crystal structure
- Institut fuer Physikalische Chemie der Universitaet Wien, Vienna (Austria)
- Universite de Rennes I (France)
- Univ. of Lviv (Ukraine)
Ternary compounds REAgSb{sub 2}, RE = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, have been synthesized by arc melting followed by a heat treatment at 600 or 800{degrees}C for 300 hr. The novel phases were all found to be isotypic with the structure type of ZrCuSi{sub 2}. Precise atom parameters have been derived for CeAgSb{sub 2} from X-ray single crystal counter data: space group P4/nmm, a = 0.43641(9) nm, c = 1.0722(4) nm, and Z = 2. For 274 reflections ({vert_bar}F{sub o}{vert_bar} > 3{sigma}) the residual values are R{sub F} = {Sigma}{vert_bar}{Delta}F{vert_bar}/{Sigma}{vert_bar}F{sub o}{vert_bar} = 0.024 and R{sub w} = 0.028. A standardized set of atom parameters is provided. Magnetism of the REAgSb{sub 2} phases in the temperature range 2.5 to 300 K is characterized by tripositive paramagnetic behavior of the rare-earth atoms. REAgSb{sub 2} with RE = Y, La are weakly temperature-dependent paramagnets. In contrast, REAgSb{sub 2} compounds with RE = Pr, Nd, Sm, Gd, Dy, Ho, Er, Tm are weak antiferromagnets with ordering temperatures lower than T{sub N} {approximately} 13 K, and CeAgSb{sub 2} is a noncolinear antiferromagnet (T{sub M} {approximately} 12 K) with a remanent magnetization {mu} = 0.15 {mu}{sub B} per Ce atom.
- OSTI ID:
- 75770
- Journal Information:
- Journal of Solid State Chemistry, Vol. 115, Issue 2; Other Information: PBD: Mar 1995
- Country of Publication:
- United States
- Language:
- English
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