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Crystallographic properties of KSr2Nb5O15

2004; Elsevier BV; Volume: 112; Issue: 2-3 Linguagem: Inglês

10.1016/j.mseb.2004.05.021

ISSN

1873-4944

Autores

Silvania Lanfredi, Celso Xavier Cardoso, Marcos A.L. Nobre,

Tópico(s)

Advanced ceramic materials synthesis

Resumo

Nanostructured KSr2Nb5O15 oxide was synthesized by the polymeric precursor method, a chemical synthesis route based on the Pechini’s method. The X-ray diffraction (XRD) pattern of the calcined powder at 1150 °C were performed in the angular range 5 ≤ 2θ ≤ 120° with a 0.02° step and a fixed counting time of 30 s. The XRD data were analyzed by the Rietveld refinements using the FullProf software. The results showed a tetragonal system with the tetragonal tungsten bronze structure (TTB) type (a = 12.4585 (2) Å and c = 3.9423 (6) Å, V = 611,90 (2) Å3). In this work, the sites occupancy by the K+ and Sr2+ cations on the TTB type structure were determined. The thermal parameters (B) were analyzed.

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