Synthesis and crystal structure of the new indide La8Co2In3

• Published in: Solid state sciences Vol. 35; pp. 45 - 49
• Main Authors: Dzevenko, M., Bigun, I., Pustovoychenko, M., Kalychak, Ya
• Format: Journal Article
• Language: English
• Published: Issy-les-Moulineaux Elsevier Masson SAS 01-09-2014; Elsevier Masson
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Crystal chemistry of intermetallics; Crystal structure; Exact sciences and technology; Indium; Intermetallic compounds; Intermetallics; Materials science; Methods of crystal growth; physics of crystal growth; Physics; Polyhedrons; Rare earth metals; Rare-earth intermetallics; Reflection; Single crystals; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; X-ray diffraction; X-ray diffraction; Rare-earth intermetallics; Crystal chemistry of intermetallics; Crystal growth; Coordination number; Space groups; Intermetallic compounds; Crystal chemistry; XRD; Indium; Cobalt; Heat treatments; Monocrystals; Arc furnaces; Crystal structure
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2014.06.011

A new ternary indide La8Co2In3 was prepared by arc-melting of the compact metals under an argon atmosphere. A subsequent high temperature treatment was used for single crystal growth. The crystal structure has been determined from X-ray single crystal data: own structure type, space group Pmn21, Pearson code oP26, Z = 2, a = 10.2646(11), b = 10.1802(12), c = 7.3235(8) Å, R1 = 0.0338, wR2 = 0.0458, for 1556 independent reflections with I > 2σ(I) and 71 variables. Similarly to intermetallic compound with a high rare earth content, atoms in the title structure have no high coordination numbers: 12–15 for lanthanum, 9 and 7 for cobalt, and 11 for indium. Strong Co–Co bonding is observed in the structure. The packing of In polyhedra can be represented as a complicated variant of the RuB2 structure type.
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•The new ternary indide La8Co2In3 has been synthesized.•The crystal structure has been determined by X-ray single crystal method.•This compound crystallizes in new structure type (space group Pbam).•Indium substructure represents the RuB2 structure type.