Segregation of Mn2+ Dopants as Interstitials in SrTiO3 Grain Boundaries

被引：20

作者：

Yang, Hao ^{[1
]}

Kotula, Paul G. ^{[2
]}

Sato, Yukio ^{[3
]}

Chi, Miaofang ^{[4
]}

Ikuhara, Yuichi ^{[3
]}

Browning, Nigel D. ^{[1
,5
]}

机构：

[1] Univ Calif Davis, Dept Chem Engn & Mat Sci, One Shields Ave, Davis, CA 95616 USA

[2] Sandia Natl Labs, Mat Characterizat Dept, Albuquerque, NM 87185 USA

[3] Univ Tokyo, Inst Engn Innovat, Bunkyo Ku, Tokyo 1138656, Japan

[4] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[5] Pacific Northwest Natl Lab, Phys Sci Div, Richland, WA 99352 USA

来源：

MATERIALS RESEARCH LETTERS | 2014年 / 2卷 / 01期

关键词：

Z-Contrast Imaging; Atomic EDS; Dopant Segregation; Grain Boundary; TEMPERATURE FERROMAGNETISM; ROOM-TEMPERATURE;

D O I：

10.1080/21663831.2013.856815

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mn-doped SrTiO3 shows promising magnetic and electrical properties, but the doping mechanism remains unclear. In this research Mn4+ is found to substitute Ti in bulk SrTiO3, but Mn2+ segregates inside grain boundaries at both Sr and interstitial sites. Mn interstitial doping has never been reported, but is found possible with the formation of Sr vacancies. This finding is significantly different from the amphoteric doping of Mn2+ substituting Sr and Mn4+ substituting Ti sites, therefore leads to different understanding on the defect mediated electrical and magnetic properties of transition metal-doped perovskites.

引用

页码：16 / 22

页数：7

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