title: Synthesis and crystal structure of La21Cr8-2aAlbGe7-bC12[a= 0.22 (2) andb= 0.758 (19)].
abstract: Single crystals of a new multinary chromium carbide, La21Cr8-2aAlbGe7-bC12(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 Cr4-aC6clusters are distributed throughout a three-dimensional framework of Al, Ge, and La. The title compound is isotypic with La21-δMn8X7C12andR21Fe8X7C12(R= La, Ce, Pr;X= Al, Bi, Ge, Sn, Sb, Te) and represents the first example of a Cr-based compound with this structure-type.
authors.affiliation: Department of Physics, Farmingdale State College, Farmingdale, NY 11735, USA.
authors.forename: Jaskarun
authors.initials: J
authors.lastname: Pabla
authors.affiliation: Department of Physics, Farmingdale State College, Farmingdale, NY 11735, USA.
authors.forename: Yuri
authors.initials: Y
authors.lastname: Janssen
authors.affiliation: Department of Physics, Farmingdale State College, Farmingdale, NY 11735, USA.
authors.forename: Jack W
authors.initials: JW
authors.lastname: Simonson
keywords: crystal structure; geometric frustration; multinary chromium carbides