Polarized XAFS Study of KNbO_3 Local Structure

概要

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N b positions in KN bO3 crystal were detertnined at room ternperature via polarized N b K-XAF Smeasurements. It has been revealed that the direction of Nb displacement in orthorhounbicphase is very close to polar axis direction. This refute eight-site unodel which assvumes thatNb atoms are disordered among several equivalent positions and phase transition are of order-disorder type. Analysis of polarized XAFS data showed that only slight disorder among closepositions is possible. The distance between these positions is of an order of temperature atornicdisplacements, so the disorder, if any, is likely of dynamic nature. Results obtained are in perfectagreement with X-ray diffraction data.
社団法人日本物理学会の論文
1997-05-15