Effect of oxygen activity on chromium segregation in Cr-doped TiO2 single crystal

U. Jayamaha; A. J. Atanacio; T. Bak; J. Nowotny; R. Liu

doi:10.1007/s11581-014-1226-9

Effect of oxygen activity on chromium segregation in Cr-doped TiO2 single crystal

U. Jayamaha, A. J. Atanacio, T. Bak, J. Nowotny, R. Liu

School of Computer, Data & Mathematical Sciences

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

7 Citations (Scopus)

Abstract

The present work determined the effect of chromium segregation on surface and near-surface composition of Cr-doped TiO2 (0.05 at.% Cr) after annealing in oxidising and strongly reducing environments at 1,073 and 1,273 K. The segregation-induced depth profiles were determined by secondary ion mass spectrometry (SIMS). It was observed that annealing in oxidising conditions [p(O2)"‰="‰105 Pa] and reducing conditions [10âˆ’11 Pa"‰>"‰p(O2)"‰>"‰10âˆ’15 Pa] results in an enrichment and depletion of the surface layer in chromium, respectively. The observed effects may be used for tailoring the surface and near-surface composition in order to impose desired properties.

Original language	English
Pages (from-to)	785-790
Number of pages	6
Journal	Ionics
Volume	21
Issue number	3
DOIs	https://doi.org/10.1007/s11581-014-1226-9
Publication status	Published - 2015

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10.1007/s11581-014-1226-9

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title = "Effect of oxygen activity on chromium segregation in Cr-doped TiO2 single crystal",

abstract = "The present work determined the effect of chromium segregation on surface and near-surface composition of Cr-doped TiO2 (0.05 at.% Cr) after annealing in oxidising and strongly reducing environments at 1,073 and 1,273 K. The segregation-induced depth profiles were determined by secondary ion mass spectrometry (SIMS). It was observed that annealing in oxidising conditions [p(O2){"}‰={"}‰105 Pa] and reducing conditions [10{\^a}ˆ{\textquoteright}11 Pa{"}‰>{"}‰p(O2){"}‰>{"}‰10{\^a}ˆ{\textquoteright}15 Pa] results in an enrichment and depletion of the surface layer in chromium, respectively. The observed effects may be used for tailoring the surface and near-surface composition in order to impose desired properties.",

author = "U. Jayamaha and Atanacio, {A. J.} and T. Bak and J. Nowotny and R. Liu",

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doi = "10.1007/s11581-014-1226-9",

language = "English",

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pages = "785--790",

journal = "Ionics",

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TY - JOUR

T1 - Effect of oxygen activity on chromium segregation in Cr-doped TiO2 single crystal

AU - Jayamaha, U.

AU - Atanacio, A. J.

AU - Bak, T.

AU - Nowotny, J.

AU - Liu, R.

PY - 2015

Y1 - 2015

N2 - The present work determined the effect of chromium segregation on surface and near-surface composition of Cr-doped TiO2 (0.05 at.% Cr) after annealing in oxidising and strongly reducing environments at 1,073 and 1,273 K. The segregation-induced depth profiles were determined by secondary ion mass spectrometry (SIMS). It was observed that annealing in oxidising conditions [p(O2)"‰="‰105 Pa] and reducing conditions [10âˆ’11 Pa"‰>"‰p(O2)"‰>"‰10âˆ’15 Pa] results in an enrichment and depletion of the surface layer in chromium, respectively. The observed effects may be used for tailoring the surface and near-surface composition in order to impose desired properties.

AB - The present work determined the effect of chromium segregation on surface and near-surface composition of Cr-doped TiO2 (0.05 at.% Cr) after annealing in oxidising and strongly reducing environments at 1,073 and 1,273 K. The segregation-induced depth profiles were determined by secondary ion mass spectrometry (SIMS). It was observed that annealing in oxidising conditions [p(O2)"‰="‰105 Pa] and reducing conditions [10âˆ’11 Pa"‰>"‰p(O2)"‰>"‰10âˆ’15 Pa] results in an enrichment and depletion of the surface layer in chromium, respectively. The observed effects may be used for tailoring the surface and near-surface composition in order to impose desired properties.

UR - http://handle.uws.edu.au:8081/1959.7/549057

U2 - 10.1007/s11581-014-1226-9

DO - 10.1007/s11581-014-1226-9

M3 - Article

SN - 0947-7047

VL - 21

SP - 785

EP - 790

JO - Ionics

JF - Ionics

IS - 3

ER -

Effect of oxygen activity on chromium segregation in Cr-doped TiO2 single crystal

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