Local structure studies of Ti for SrTi.sup.16./sup.O.sub.3./sub. and SrTi.sup.18./sup.O.sub.3./sub. by advanced x-ray absorption spectroscopy data analysis

0456959 - FZÚ 2016 RIV GB eng J - Článek v odborném periodiku
Anspoks, A. - Timoshenko, J. - Bocharov, D. - Purans, J. - Rocca, F. - Sarakovskis, A. - Trepakov, Vladimír - Dejneka, Alexandr - Itoh, M.
Local structure studies of Ti for SrTi¹⁶O₃ and SrTi¹⁸O₃ by advanced x-ray absorption spectroscopy data analysis.
Ferroelectrics. Roč. 485, č. 1 (2015), s. 42-52. ISSN 0015-0193. E-ISSN 1563-5112
Grant CEP: GA ČR GAP108/12/1941
Institucionální podpora: RVO:68378271
Klíčová slova: strontium titanate * quantum paraelectric * isotopic effect * X-ray absorption spectroscopy * local atomic structure * phase transitions
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 0.491, rok: 2015

Strontium titanate is a model quantum paraelectric in which in the region of dominating quantum statistics the ferroelectric instability is inhibited due to nearly complete compensation of the harmonic contribution into ferroelectric soft mode frequency by the zero-point motion contribution. The enhancement of atomic masses by the substitution of O-18 for O-16 decreases the zero-point atomic motion and low-T ferroelectricity in (SrTiO3)-O-18 is realized. In this study we report on the local structure of Ti in (SrTiO3)-O-16 and (SrTiO3)-O-18 by Ti K-edge extended x-ray absorption fine structure measurements in temperature range 6 - 300K.
Trvalý link: http://hdl.handle.net/11104/0257416