A FAMILY OF NEW COMPOUNDS DERIVED FROM CHALCOPYRITE. COMMON PATTERNS IN THEIR ELECTRONIC AND CRYSTAL STRUCTURES

A series of new compounds has been synthesized by insertion of alkali or alkaline earth-metals in chalcopyrite, CuFeS2. Their crystal structures vary from layered arrangements of tetrahedra in a trigonal (LiCuFeS2, NaCuFeS2) or a tetragonal symmetry (KCuFeS2, CsCuFeS2), to three-dimensional cubic fr...

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Autores principales: RAMIREZ,RAFAEL, MUJICA,CARLOS, BULJAN,ANTONIO, LLANOS,JAIME
Lenguaje:English
Publicado: Sociedad Chilena de Química 2001
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Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000300002
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Sumario:A series of new compounds has been synthesized by insertion of alkali or alkaline earth-metals in chalcopyrite, CuFeS2. Their crystal structures vary from layered arrangements of tetrahedra in a trigonal (LiCuFeS2, NaCuFeS2) or a tetragonal symmetry (KCuFeS2, CsCuFeS2), to three-dimensional cubic framework (Ba6Cu12Fe13S 27). Despite these differences, the synthesized compounds follow a common structural pattern: the sulfur and M atoms (M= Li, Na, K, Cs, or Ba) are ordered in a distorted face-centered-cubic lattice, where all tetrahedral holes surrounded by S atoms are occupied by the transition metal elements. The tetrahedral holes surrounded by both S atoms and at least one M element are empty. The band structures of these compounds are discussed in the framework of an extended Hückel Hamiltonian