Local structural distortions below and above the antiferrodistortive phase transition

B. Rechav; Y. Yacoby; E. A. Stern; J. J. Rehr; M. Newville

doi:10.1103/physrevlett.72.1352

Local structural distortions below and above the antiferrodistortive phase transition

B. Rechav, Y. Yacoby, E. A. Stern, J. J. Rehr, M. Newville

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Abstract

Quantitative measurements of oxygen octahedra local rotation angles are reported for the antiferrodistortive type perovskites, Na0.82K0.18TaO3 and NaTaO3. The results were obtained using a detailed analysis of x-ray absorption fine structure spectra. These results show that the oxygen octahedra rotation angle at the peak of the rotation angle distribution function of an antiferrodistortive crystal is nonzero and large, hundreds of degrees above the transition temperature.

Original language	English
Pages (from-to)	1352-1355
Number of pages	4
Journal	Physical Review Letters
Volume	72
Issue number	9
DOIs	https://doi.org/10.1103/physrevlett.72.1352
State	Published - 1994
Externally published	Yes

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AU - Yacoby, Y.

AU - Stern, E. A.

AU - Rehr, J. J.

AU - Newville, M.

PY - 1994

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N2 - Quantitative measurements of oxygen octahedra local rotation angles are reported for the antiferrodistortive type perovskites, Na0.82K0.18TaO3 and NaTaO3. The results were obtained using a detailed analysis of x-ray absorption fine structure spectra. These results show that the oxygen octahedra rotation angle at the peak of the rotation angle distribution function of an antiferrodistortive crystal is nonzero and large, hundreds of degrees above the transition temperature.

AB - Quantitative measurements of oxygen octahedra local rotation angles are reported for the antiferrodistortive type perovskites, Na0.82K0.18TaO3 and NaTaO3. The results were obtained using a detailed analysis of x-ray absorption fine structure spectra. These results show that the oxygen octahedra rotation angle at the peak of the rotation angle distribution function of an antiferrodistortive crystal is nonzero and large, hundreds of degrees above the transition temperature.

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Local structural distortions below and above the antiferrodistortive phase transition

Abstract

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