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Análise cristalográfica da solução sólida com estrutura tipo Tungstênio Bronze de niobato de potássio e estrôncio dopado com ferro

2010; Brazilian Chemical Society; Volume: 33; Issue: 5 Linguagem: Inglês

10.1590/s0100-40422010000500012

ISSN

1678-7064

Autores

Silvania Lanfredi, Marcos A.L. Nobre, Alan R. F. Lima,

Tópico(s)

Pigment Synthesis and Properties

Resumo

NIOBATE WITH TETRAGONAL TUNGSTEN BRONZE STRUCTURE.Solid solution of iron doped potassium strontium niobate with KSr 2 (FeNb 4 )O 15-d stoichiometry was prepared by high efficiency ball milling method.Structural characterization was carried out by X-ray diffraction.Crystalline structure was analyzed by the Rietveld refinements using the FullProf software.The results showed a tetragonal system with the tetragonal tungsten bronze structure -TTB (a = 12.4631 (2) Å and c = 3.9322 (6) Å, V = 610.78(2) Å 3 ).In this work, the sites occupancy by the K + , Sr 2+ and Fe 3+ cations on the TTB structure were determined.NbO 6 polihedra distortion and its correlation with the theoretical polarization are discussed.

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