SciELO - Scientific Electronic Library Online

 
vol.46 número3"EFFECT OF THE CONDITIONS OF ELECTROPOLYMERIZATION ON THE ELECTROCATALYTIC RESPONSE OF NON-METALLED- POLY-TETRAAMINOPHTHALOCYANINE-MODIFIED ELECTRODES TOWARD THE REDUCTION OF OXYGEN" índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

RAMIREZ, RAFAEL; MUJICA, CARLOS; BULJAN, ANTONIO  e  LLANOS, JAIME. A FAMILY OF NEW COMPOUNDS DERIVED FROM CHALCOPYRITE. COMMON PATTERNS IN THEIR ELECTRONIC AND CRYSTAL STRUCTURES. Bol. Soc. Chil. Quím. [online]. 2001, vol.46, n.3, pp.235-245. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442001000300002.

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

Palavras-chave : chalcogenides; semiconductors; electronic structure; crystal structure.

        · resumo em Espanhol     · texto em Inglês

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons