Crystallochemistry of the novel two-layer RECuMg{sub 4} (RE=La, Tb) ternary compounds

Journal Article · Thu Nov 15 00:00:00 EST 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.09.003· OSTI ID:21043727

Solokha, P ^[1]; De Negri, S ^[2]; Pavlyuk, V ^[1]; Saccone, A ^[2]; Marciniak, B ^[3]

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1. Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryl and Mefodiy Street 6, 79005 Lviv (Ukraine)
2. Dipartimento di Chimica e Chimica Industriale, Sezione di Chimica Inorganica e Metallurgia, Universita di Genova, Via Dodecaneso 31, I-16146 Genova (Italy)
3. Institute of Chemistry and Environment Protection, Jan Dlugosz University, al. Armii Krajowej 13/15, 42200 Czestochowa (Poland)

The crystal structures of the new ternary compounds LaCuMg{sub 4} and TbCuMg{sub 4} were studied by X-ray powder diffraction and single-crystal methods, respectively. Scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDXS) was used for examining microstructure and phase composition. LaCuMg{sub 4} crystallizes in the UCoAl{sub 4} structure type (space group P6-bar 2m, Pearson code hP18, a=1.03911(1), c=0.45126(1) nm, Z=3, R{sub F}=0.0654), while TbCuMg{sub 4} exhibits a new structure (space group Cmmm, Pearson code oS48, a=1.35797(6), b=2.03333(9), c=0.39149(2) nm, Z=8, wR{sub 2}=0.0426). Both structures represent a family of two-layer compounds. All interatomic distances indicate metallic type bonding. The structural peculiarities of these compounds and their relations are discussed. - Graphical abstract: Slightly distorted body centered Mg blocks as structural motifs in the LaCuMg{sub 4} and TbCuMg{sub 4} compounds.

• OSTI ID: 21043727
• Journal Information: Journal of Solid State Chemistry, Vol. 180, Issue 11; Other Information: DOI: 10.1016/j.jssc.2007.09.003; PII: S0022-4596(07)00371-4; Copyright (c) 2007 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

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPPER COMPOUNDS
INTERATOMIC DISTANCES
INTERMETALLIC COMPOUNDS
LANTHANUM COMPOUNDS
LAYERS
MAGNESIUM COMPOUNDS
MICROSTRUCTURE
MONOCRYSTALS
ORTHORHOMBIC LATTICES
SCANNING ELECTRON MICROSCOPY
SPACE GROUPS
TERBIUM COMPOUNDS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY