Characterization of oxygen vacancies in SrTiO3 by means of anelastic and Raman spectroscopy

被引：31

作者：

Chapron, David ^{[1
,2
]}

Cordero, Francesco ^{[3
]}

Fontana, Marc D. ^{[1
]}

机构：

[1] Univ Lorraine, Lab Mat Opt Photon & Syst, EA 4423,2 Rue Edouard Belin, F-57070 Metz, France

[2] Cent Supelec, Lab Mat Opt Photon & Syst, EA 4423, 2 Rue Edouard Belin, F-57070 Metz, France

[3] CNR, ISM, Area Ric Roma Tor Vergata, Via Fosso del Cavaliere 100, I-00133 Rome, Italy

来源：

JOURNAL OF APPLIED PHYSICS | 2019年 / 126卷 / 15期

关键词：

SCATTERING; SPECTRUM; CHEMOMETRICS;

D O I：

10.1063/1.5115106

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Oxygen vacancies in reduced SrTiO3 are investigated by Raman spectroscopy and dynamic elastic modulus measurements. The anelastic spectrum is used to evaluate the amount and state of the O vacancies, which result to be almost completely paired and otherwise aggregated at a concentration of 0.5 mol. %, with only 1/6 of them isolated at room temperature. Raman spectra recorded as a function of temperature in as-grown and reduced samples are examined regarding the different processes which can contribute to them. Chemometric analysis is used to highlight the specific influence of oxygen vacancies on the Raman spectra. It is shown that oxygen vacancies induce a relaxation of selection rules leading to the activation of first-order lines even in the cubic phase. Furthermore, regions around oxygen vacancies are demonstrated to be responsible for the asymmetric broadening of Raman lines. Published under license by AIP Publishing.

引用

页数：8

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