Niobium segregation in TiO2

T. Nakajima; L. R. Sheppard; K. E. Prince; J. Nowotny; T. Ogawa

doi:10.1179/174367607X156034

Niobium segregation in TiO₂

T. Nakajima, L. R. Sheppard, K. E. Prince, J. Nowotny, T. Ogawa

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16 Citations (Scopus)

Abstract

The present paper reports the effect of oxygen activity p(O₂) on Nb segregation in a polycrystalline specimen of Nb doped TiO₂ (2.91 at.-%). The determined segregation induced enrichment factor following annealing at 1773 K in p(O₂)=10 Pa and p(O₂)=21 kPa is 3.1 and 7.3 respectively. The data on the effect of p(O₂) on the segregation induced Nb enrichment factor are considered in terms of defect disorder of Nb doped TiO₂ and the related lattice charge neutrality requirements. The reported segregation data may be used for controlled modification of surface concentration gradients in TiO₂ through the imposition of well defined gas phase composition during processing procedures.

Original language	English
Pages (from-to)	82-88
Number of pages	7
Journal	Advances in Applied Ceramics
Volume	106
Issue number	1-2
DOIs	https://doi.org/10.1179/174367607X156034
Publication status	Published - Feb 2007
Externally published	Yes

Keywords

Defect disorder
Mass spectrometry
Niobium segregation
Secondary ion
Titanium dioxide

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10.1179/174367607X156034

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title = "Niobium segregation in TiO2",

abstract = "The present paper reports the effect of oxygen activity p(O2) on Nb segregation in a polycrystalline specimen of Nb doped TiO2 (2.91 at.-%). The determined segregation induced enrichment factor following annealing at 1773 K in p(O2)=10 Pa and p(O2)=21 kPa is 3.1 and 7.3 respectively. The data on the effect of p(O2) on the segregation induced Nb enrichment factor are considered in terms of defect disorder of Nb doped TiO2 and the related lattice charge neutrality requirements. The reported segregation data may be used for controlled modification of surface concentration gradients in TiO2 through the imposition of well defined gas phase composition during processing procedures.",

keywords = "Defect disorder, Mass spectrometry, Niobium segregation, Secondary ion, Titanium dioxide",

author = "T. Nakajima and Sheppard, {L. R.} and Prince, {K. E.} and J. Nowotny and T. Ogawa",

year = "2007",

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language = "English",

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journal = "Advances in Applied Ceramics",

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TY - JOUR

T1 - Niobium segregation in TiO2

AU - Nakajima, T.

AU - Sheppard, L. R.

AU - Prince, K. E.

AU - Nowotny, J.

AU - Ogawa, T.

PY - 2007/2

Y1 - 2007/2

N2 - The present paper reports the effect of oxygen activity p(O2) on Nb segregation in a polycrystalline specimen of Nb doped TiO2 (2.91 at.-%). The determined segregation induced enrichment factor following annealing at 1773 K in p(O2)=10 Pa and p(O2)=21 kPa is 3.1 and 7.3 respectively. The data on the effect of p(O2) on the segregation induced Nb enrichment factor are considered in terms of defect disorder of Nb doped TiO2 and the related lattice charge neutrality requirements. The reported segregation data may be used for controlled modification of surface concentration gradients in TiO2 through the imposition of well defined gas phase composition during processing procedures.

AB - The present paper reports the effect of oxygen activity p(O2) on Nb segregation in a polycrystalline specimen of Nb doped TiO2 (2.91 at.-%). The determined segregation induced enrichment factor following annealing at 1773 K in p(O2)=10 Pa and p(O2)=21 kPa is 3.1 and 7.3 respectively. The data on the effect of p(O2) on the segregation induced Nb enrichment factor are considered in terms of defect disorder of Nb doped TiO2 and the related lattice charge neutrality requirements. The reported segregation data may be used for controlled modification of surface concentration gradients in TiO2 through the imposition of well defined gas phase composition during processing procedures.

KW - Defect disorder

KW - Mass spectrometry

KW - Niobium segregation

KW - Secondary ion

KW - Titanium dioxide

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DO - 10.1179/174367607X156034

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SP - 82

EP - 88

JO - Advances in Applied Ceramics

JF - Advances in Applied Ceramics

IS - 1-2

ER -

Niobium segregation in TiO₂

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Keywords

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