Synthesis and crystal structure of La₂₁Cr_8-2a Al _b Ge_7-b C₁₂ [a = 0.22 (2) and b = 0.758 (19)].

ABSTRACT: Single crystals of a new multinary chromium carbide, La₂₁Cr_8-2a Al _b Ge_7-b C₁₂ (henicosa-lanthanum octa-chromium aluminium hexa-germanium dodeca-carbide), were grown from an La-rich self flux and were characterized by single-crystal X-ray diffraction. The face-centered cubic crystal structure is composed of isolated and geometrically frustrated regular Cr tetra-hedra that are co-centered within regular C octa-hedra. These mutually separated Cr_4-aC₆ clusters are distributed throughout a three-dimensional framework of Al, Ge, and La. The title compound is isotypic with La_21-δMn₈X₇C₁₂ and R₂₁Fe₈X₇C

SUBMITTER: Pabla J 

PROVIDER: S-EPMC5095834 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature