Local structure studies of $\mathrm{SrTi^{16}O_{3}}$ and $\mathrm{SrTi^{18}O_{3}}$

Anspoks, A.; Rocca, F.; Sarakovskis, A.; Dejneka, A.; Purans, J.; Itoh, M.; Bocharov, D.; Trepakov, V.

doi:10.1088/0031-8949/89/04/044002

Journal Article

PUBDB-2015-05195

Local structure studies of $\mathrm{SrTi^{16}O_{3}}$ and $\mathrm{SrTi^{18}O_{3}}$

Anspoks, A. (Corresponding author)>Extern* ; Bocharov, D. ; Purans, J. ; Rocca, F. ; Sarakovskis, A. ; Trepakov, V. ; Dejneka, A. ; Itoh, M.

2014
IoP Publ. Bristol

Physica scripta 89(4), 044002 (2014) [10.1088/0031-8949/89/04/044002]

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Please use a persistent id in citations: doi:10.1088/0031-8949/89/04/044002

Abstract: In this work we report on the local structure of Ti in SrTi$^{16}$O$_{3}$ (STO16) and SrTi$^{18}$O$_{3}$ (STO18) investigated in the low temperature range (6–300 K) by extended x-ray absorption fine structure and x-ray absorption near edge structure (XANES) spectroscopy at Ti K-edge and by optical second harmonic generation (SHG). By comparing XANES of STO16 and STO18 we have identified the isotopic effect which produces at T < 100K a noticeable difference in the measured mean square relative displacements (MSRD) of Ti–O1 bonds: while STO16 follow the expected Einstein-like behavior, for STO18 we have measured an increase of MSRD values with decreasing temperature. This is an indication of an increasing off-center position of the Ti atoms in the TiO$_{6}$ octahedra.

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