A structural study of the (Na1-xKx)(0.5)Bi0.5TiO3 perovskite series as a function of substitution (x) and temperature
UNSPECIFIED. (2002) A structural study of the (Na1-xKx)(0.5)Bi0.5TiO3 perovskite series as a function of substitution (x) and temperature. POWDER DIFFRACTION, 17 (4). pp. 301-319. ISSN 0885-7156Full text not available from this repository.
Official URL: http://dx.doi.org/10.1154/1.1505047
Rietveld neutron powder profile analysis of the (Na1-xKx)(0.5)Bi0.5TiO3 (NKBT) series (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0) is reported over the temperature range 293-993 K. A detailed characterization of the structures and phase transitions occurring across this series as a function of temperature has been made. Room-temperature refinements have revealed a rhombohedral phase, space group R3c for x = 0, 0.2, and 0.4, which exhibits an antiphase, a (-) a (-) a (-) oxygen tilt system with parallel cation displacements along (p). An intermediate zero-tilt rhombohedral phase, space group R3m possessing cation displacements along p, has been established for x = 0.5 and 0.6. At the potassium-rich end of the series at x = 0.8 and 1.0, a tetragonal phase, space group P4mm is observed possessing cation displacements along . At the sodium-rich end of the series for x = 0.2, the unusual tetragonal structure with space group P4bm is seen for Na0.5Bi0.5TiO3 which possesses a combination of in-phase a(0)a(0)c(+) tilts and antiparallel cation displacements along the polar axis. Temperature-induced phase transitions are reported and structural modifications are discussed. (C) 2002 International Centre for Diffraction Data.
|Item Type:||Journal Article|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)|
|Journal or Publication Title:||POWDER DIFFRACTION|
|Publisher:||J C P D S-INT CENTRE DIFFRACTION DATA|
|Official Date:||December 2002|
|Number of Pages:||19|
|Page Range:||pp. 301-319|
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