Local structure studies of SrTi super(16)O sub(3) and SrTi super(18)O sub(3)

In this work we report on the local structure of Ti in SrTi super(16)O sub(3) (STO16) and SrTi super(18)O sub(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 o...

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Published in:Physica scripta 2014-04, Vol.89 (4), p.1-5
Main Authors: Anspoks, A, Bocharov, D, Purans, J, Rocca, F, Sarakovskis, A, Trepakov, V, Dejneka, A, Itoh, M
Format: Article
Language:English
Subjects:
Fine structure
Indication
Mean square values
Second harmonic generation
Spectroscopy
Titanium
Titanium dioxide
X-rays
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container_issue 4
container_start_page 1
container_title Physica scripta
container_volume 89
creator Anspoks, A
Bocharov, D
Purans, J
Rocca, F
Sarakovskis, A
Trepakov, V
Dejneka, A
Itoh, M
description In this work we report on the local structure of Ti in SrTi super(16)O sub(3) (STO16) and SrTi super(18)O sub(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 < 100 K a noticeable difference in the measured mean square relative displacements (MSRD) of Ti-O sub(1) 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 sub(6) octahedra.
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subjects Fine structure
Indication
Mean square values
Second harmonic generation
Spectroscopy
Titanium
Titanium dioxide
X-rays
title Local structure studies of SrTi super(16)O sub(3) and SrTi super(18)O sub(3)
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