Doping and temperature-dependent optical properties of oxygen-reduced BaTiO3-δ

被引：52

作者：

Hwang, J. ^{[1
,2
]}

Kolodiazhnyi, T. ^{[3
]}

Yang, J. ^{[1
,4
]}

Couillard, M. ^{[5
]}

机构：

[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[2] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea

[3] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

[4] Tianjin Univ, Sch Mat Sci & Engn, Tianjin Key Lab Composite & Funct Mat, Tianjin 300072, Peoples R China

[5] McMaster Univ, Canadian Ctr Electron Microscopy, Hamilton, ON L8S 4M1, Canada

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 21期

基金：

新加坡国家研究基金会;

关键词：

FERROELECTRIC BARIUM-TITANATE; NB-DOPED SRTIO3; ELECTRON-SCATTERING; ORDER-DISORDER; MODE; ABSORPTION; LATTICE; SEMICONDUCTORS; PEROVSKITES; FREQUENCIES;

D O I：

10.1103/PhysRevB.82.214109

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on optical properties of reduced BaTiO3-delta at different doping levels including insulating and metallic samples. In all the samples, including metallic one, we observe structural phase transitions from the changes in the infrared-active phonon modes. Metallic ground state is confirmed by the Drude-type low-frequency optical reflectance. Similar to SrTiO3-delta we find that the midinfrared-absorption band in BaTiO3-delta appears and grows with an increase in the oxygen-vacancy concentration. Upon decrease in temperature from 300 K, the midinfrared band shifts slightly to higher frequency and evolves into two bands: the existing band and a new and smaller band at lower frequency. The appearance of the new and smaller band seems to be correlated with the structural phase transitions.

引用

页数：8