Segregation of Mn2+ dopants as interstitials in SrTiO3 grain boundaries

Hao Yang; Paul G. Kotula; Yukio Sato; Miaofang Chi; Yuichi Ikuhara; Nigel D. Browning

doi:10.1080/21663831.2013.856815

Segregation of Mn²⁺ dopants as interstitials in SrTiO₃ grain boundaries

Hao Yang, Paul G. Kotula, Yukio Sato, Miaofang Chi, Yuichi Ikuhara, Nigel D. Browning

electron Microscopy and Microanalysis

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	16-22
Number of pages	7
Journal	Materials Research Letters
Volume	2
Issue number	1
DOIs	https://doi.org/10.1080/21663831.2013.856815
State	Published - 2014

Bibliographical note

Publisher Copyright:
© 2013.

Funding

Acknowledgements This work is supported by the US Department of Energy Grant No. DE-FG02-03ER46057. A part of the work was conducted in the ShaRE user facility at Oak Ridge National Laboratory, and in the Research Hub for Advanced NanoCharacterization, The University of Tokyo, supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. The research described in this paper is part of the Chemical Imaging Initiative at PNNL under Contract DE-AC05-76RL01830 operated for DOE by Battelle. A portion of the research was performed using EMSL, a national scientific user facility sponsored by the Department of Energy’s Office of Biological and Environmental Research and located at PNNL.

Funders	Funder number
Chemical Imaging Initiative
U.S. Department of Energy	DE-FG02-03ER46057
Battelle
Biological and Environmental Research
Pacific Northwest National Laboratory	DE-AC05-76RL01830
Japan Society for the Promotion of Science	23760632
Ministry of Education, Culture, Sports, Science and Technology
University of Tokyo

Keywords

Atomic EDS
Dopant segregation
Grain boundary
Z-Contrast imaging

Access to Document

10.1080/21663831.2013.856815

Cite this

@article{52b854d9f0e848dfbdc22f1eb471e382,

title = "Segregation of Mn2+ dopants as interstitials in SrTiO3 grain boundaries",

abstract = "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.",

keywords = "Atomic EDS, Dopant segregation, Grain boundary, Z-Contrast imaging",

author = "Hao Yang and Kotula, {Paul G.} and Yukio Sato and Miaofang Chi and Yuichi Ikuhara and Browning, {Nigel D.}",

note = "Publisher Copyright: {\textcopyright} 2013.",

year = "2014",

doi = "10.1080/21663831.2013.856815",

language = "English",

volume = "2",

pages = "16--22",

journal = "Materials Research Letters",

issn = "2166-3831",

publisher = "Taylor and Francis Group",

number = "1",

}

TY - JOUR

T1 - Segregation of Mn2+ dopants as interstitials in SrTiO3 grain boundaries

AU - Yang, Hao

AU - Kotula, Paul G.

AU - Sato, Yukio

AU - Chi, Miaofang

AU - Ikuhara, Yuichi

AU - Browning, Nigel D.

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - Atomic EDS

KW - Dopant segregation

KW - Grain boundary

KW - Z-Contrast imaging

UR - http://www.scopus.com/inward/record.url?scp=85011890539&partnerID=8YFLogxK

U2 - 10.1080/21663831.2013.856815

DO - 10.1080/21663831.2013.856815

M3 - Article

AN - SCOPUS:85011890539

SN - 2166-3831

VL - 2

SP - 16

EP - 22

JO - Materials Research Letters

JF - Materials Research Letters

IS - 1

ER -