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Synthesis and crystal growth of sillenite phases in the Bi 2 O 3 ‐ TiO 2 ‐ Nb 2 O 5 system
Author(s) -
dos Santos T. O.,
Carvalho J. F.,
Hernandes A. C.
Publication year - 2004
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200410268
Subject(s) - niobium , crystallite , phase (matter) , doping , analytical chemistry (journal) , materials science , solubility , solid solution , crystal (programming language) , crystal growth , powder diffraction , x ray crystallography , diffraction , crystallography , inorganic chemistry , chemistry , optics , organic chemistry , metallurgy , physics , optoelectronics , computer science , programming language
Abstract The synthesis of Bi 2 O 3 ‐Nb 2 O 5 sillenite phase (BNbO) and the solubility of this phase with Bi 12 TiO 20 was investigated by solid‐state reaction synthesis and niobium doped Bi 12 TiO 20 (BTO:Nb) crystals were grown by the Top Seeded Solution Growth (TSSG) technique. The structures of polycrystalline compounds were checked by X‐ray powder diffraction method at room temperature. The correct composition of the sillenite phase stabilized with niobium was determined as Bi 12 [Nb 0.17 Bi 0.83 ]O 19.7 (BNbO) with unit cell parameter a = 10.261(2) Å. The system BTO‐BNbO is poorly soluble, but niobium doped BTO crystals were grown from the liquid composition 10Bi 2 O 3 : xTiO 2 : (1‐ x )/2 Nb 2 O 5 , with x = 0.95 and 0.90. A niobium concentration limit in the liquid phase is established in order to grow BTO:Nb with good crystalline quality. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)