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On the existence of a pyrochlore‐type phase in the system Bi 2 O 3 –TiO 2
Author(s) -
Kahlenberg V.,
Böhm Prof.Dr.H.
Publication year - 1995
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.2170300221
Subject(s) - pyrochlore , bismuth titanate , bismuth , materials science , diffraction , crystallography , phase (matter) , rietveld refinement , solid solution , powder diffraction , x ray crystallography , titanate , mineralogy , analytical chemistry (journal) , ceramic , crystal structure , chemistry , ferroelectricity , physics , metallurgy , optics , optoelectronics , organic chemistry , dielectric , chromatography
The existence of a bismuth titanate in the range between Bi 2 Ti 4 O 11 (Bi 2 O 3 · 4 TiO 2 ) and Bi 4 Ti 3 O 12 (2 Bi 2 O 3 3TiO 2 ) has been investigated by X‐ray diffraction of samples prepared by solid state reactions. For reaction temperatures above 1100 °C and a starting composition Bi 2 O 3 · 2 TiO 2 there appeared additional lines which could be attributed to a cubic face‐centred cell with a = 10.354 Å. A multiphase Rietveld analysis based on X‐ray powder diffraction data confirmed the structural model of a pyrochlore for this compound. There is evidence that this phase belongs to the group of defect pyrochlores with a Bi 3+ ‐deficiency resulting in a composition of Bi 1.833 Ti 2 O 6.75 .