The temperature dependence for the third shell's Fourier-peak of Nb-EXAFS in KNbO3 as additional source of information on the local atomic structure

The information on the structure of tetragonal KNbO3 is extracted from the temperature dependence of the third shell's Fourier-peak of Nb-EXAFS. It is shown that this dependence can be explained by two effects: 1) rigid rotations of the O6-octahedron and 2) increase of the third shell's DW...

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Veröffentlicht in:Journal of synchrotron radiation. - 1999. - 8(2001), Pt 2 vom: 01. März, Seite 308-10
1. Verfasser: Bugaev, L A (VerfasserIn)
Weitere Verfasser: Shuvaeva, V A, Zhuchkov, K N, Rusakova, E B, Vedrinskii, R V
Format: Aufsatz
Sprache:English
Veröffentlicht: 2001
Zugriff auf das übergeordnete Werk:Journal of synchrotron radiation
Schlagworte:Journal Article
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245 1 4 |a The temperature dependence for the third shell's Fourier-peak of Nb-EXAFS in KNbO3 as additional source of information on the local atomic structure 
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520 |a The information on the structure of tetragonal KNbO3 is extracted from the temperature dependence of the third shell's Fourier-peak of Nb-EXAFS. It is shown that this dependence can be explained by two effects: 1) rigid rotations of the O6-octahedron and 2) increase of the third shell's DW-parameter. However, diffraction data on the temperature dependence of the DW-parameter permit us to conclude that the last effect only is sufficient and the O6-octahedron rotation doesn't occur in the high-temperature phases of KNbO3. Using EXAFS it is revealed that in the neighboring cells Nb-atoms are parallel shifted closely to [211] direction in tetragonal phase 
650 4 |a Journal Article 
700 1 |a Shuvaeva, V A  |e verfasserin  |4 aut 
700 1 |a Zhuchkov, K N  |e verfasserin  |4 aut 
700 1 |a Rusakova, E B  |e verfasserin  |4 aut 
700 1 |a Vedrinskii, R V  |e verfasserin  |4 aut 
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