Small-defect clusters in chromia-doped rutiles

L. A. Bursill; David J. Smith; Peng Ju Lin

doi:10.1016/0022-4596(85)90057-X

Small-defect clusters in chromia-doped rutiles

L. A. Bursill, David J. Smith, Peng Ju Lin

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

13 Scopus citations

Abstract

Bright-field phase contrast electron microscope images of chromia-doped rutiles have been used to study the size and distribution of small defect clusters in specimens of TiO₂, (Ti,Cr)O_1.995, and (Ti,Cr)O_1.985. Comparisons of observed and measured spot contrast densities, and contrast calculations using computer simulations of the defect structures, lead to the conclusion that the smallest clusters observed contained ∼32 Cr³⁺ cations. Larger clusters occurred with increasing frequency for higher dopant levels, which is consistent with increased interaction and aggregation of traditional or reconstructed small defects (e.g., Cr³⁺ interstitials or charge-compensated oxygen vacancies).

Original language	English (US)
Pages (from-to)	203-210
Number of pages	8
Journal	Journal of Solid State Chemistry
Volume	56
Issue number	2
DOIs	https://doi.org/10.1016/0022-4596(85)90057-X
State	Published - Feb 1985
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/0022-4596(85)90057-X

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title = "Small-defect clusters in chromia-doped rutiles",

abstract = "Bright-field phase contrast electron microscope images of chromia-doped rutiles have been used to study the size and distribution of small defect clusters in specimens of TiO2, (Ti,Cr)O1.995, and (Ti,Cr)O1.985. Comparisons of observed and measured spot contrast densities, and contrast calculations using computer simulations of the defect structures, lead to the conclusion that the smallest clusters observed contained ∼32 Cr3+ cations. Larger clusters occurred with increasing frequency for higher dopant levels, which is consistent with increased interaction and aggregation of traditional or reconstructed small defects (e.g., Cr3+ interstitials or charge-compensated oxygen vacancies).",

author = "Bursill, {L. A.} and Smith, {David J.} and Lin, {Peng Ju}",

note = "Funding Information: This work was supported by the Australian Research Grants Committee, the Universities of Melbourne and Nanking and the Science and Engineering Research Council (U.K.). DJS is grateful to the University of Melbourne for support of a 2-month visit to the School of Physics. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.",

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doi = "10.1016/0022-4596(85)90057-X",

language = "English (US)",

volume = "56",

pages = "203--210",

journal = "Journal of Solid State Chemistry",

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T1 - Small-defect clusters in chromia-doped rutiles

AU - Bursill, L. A.

AU - Smith, David J.

AU - Lin, Peng Ju

N1 - Funding Information: This work was supported by the Australian Research Grants Committee, the Universities of Melbourne and Nanking and the Science and Engineering Research Council (U.K.). DJS is grateful to the University of Melbourne for support of a 2-month visit to the School of Physics. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.

PY - 1985/2

Y1 - 1985/2

N2 - Bright-field phase contrast electron microscope images of chromia-doped rutiles have been used to study the size and distribution of small defect clusters in specimens of TiO2, (Ti,Cr)O1.995, and (Ti,Cr)O1.985. Comparisons of observed and measured spot contrast densities, and contrast calculations using computer simulations of the defect structures, lead to the conclusion that the smallest clusters observed contained ∼32 Cr3+ cations. Larger clusters occurred with increasing frequency for higher dopant levels, which is consistent with increased interaction and aggregation of traditional or reconstructed small defects (e.g., Cr3+ interstitials or charge-compensated oxygen vacancies).

AB - Bright-field phase contrast electron microscope images of chromia-doped rutiles have been used to study the size and distribution of small defect clusters in specimens of TiO2, (Ti,Cr)O1.995, and (Ti,Cr)O1.985. Comparisons of observed and measured spot contrast densities, and contrast calculations using computer simulations of the defect structures, lead to the conclusion that the smallest clusters observed contained ∼32 Cr3+ cations. Larger clusters occurred with increasing frequency for higher dopant levels, which is consistent with increased interaction and aggregation of traditional or reconstructed small defects (e.g., Cr3+ interstitials or charge-compensated oxygen vacancies).

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Small-defect clusters in chromia-doped rutiles

Abstract

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