SciELO - Scientific Electronic Library Online

 
vol.46 número2CHARACTERIZATION OF ALKALICELLULOSE OF PINUS RADIATA AND EUCALYPTUS GLOBULUS BASED ON ITS MOLECULAR WEIGHT AND DEGREE OF ACCESIBILITYIDENTIFICATION OF A NEW AROMATIC GERANYL DERIVATIVE IN THE RESINOUS EXUDATE OF HELIOTROPIUM FILIFOLIUM (BORAGINACEAE) índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Não possue artigos similaresSimilares em SciELO
  • Em processo de indexaçãoSimilares em Google

Compartilhar


Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

BARBATO, SALVADOR; RESTOVIC, AMBROSIO  e  GAUTIER, JUAN LUIS. HOLLANDITE CATHODES FOR LITHIUM ION BATTERIES: 1. SYNTHESIS AND CHARACTERIZATION OF THE MM'Mn7O16 COMPOUNDS (M= K, Ba; M' = Mg, Mn, Fe, Ni). Bol. Soc. Chil. Quím. [online]. 2001, vol.46, n.2, pp.165-173. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442001000200010.

BaMMn7O16 (M = Mg, Mn, Fe, Ni) and AMn8O16 (A = Ba, K2) hollandite oxides were synthesized in air from metal carbonates and a mixture of simple oxides using the thermal decomposition in solid phase method at 850 C. The oxides BaMn8O16 and BaFeMn7O16 crystallized in the hollandite monoclinic phase, S.G. I2/m and S.G. P21/n respectively, whereas K2Mn8O16 was tetragonal, S.G. I4/m. Two new phases are reported: BaMgMn7O16 and BaNiMn7O16 which crystallize in the hollandite monoclinic phase structure. The ionic distributions were proposed on the basis of several physicochemical analyses comporting XRD, GTA, magnetic susceptibility and oxidation power measurements. Barium and potassium manganites showed Mn3+ and Mn4+ in octahedral sites whereas BaMMn7O16 (M = Mg, Ni) exhibited Mn2+ and Mn4+ in sites B. On the other hand, iron-manganese hollandite, BaFeMn7O16, shows Fe3+ ions besides Mn3+ and Mn4+ cations

Palavras-chave : Hollandite; Cationic distribution; Mixed oxides; Manganates; Ionic conductor.

        · 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