Niobium diffusion in niobium-doped titanium dioxide

L. R. Sheppard; A. J. Atanacio; T. Bak; J. Nowotny; M. K. Nowotny; K. E. Prince

doi:10.1007/s10008-008-0717-x

Niobium diffusion in niobium-doped titanium dioxide

L. R. Sheppard, A. J. Atanacio, T. Bak, J. Nowotny, M. K. Nowotny, K. E. Prince

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Abstract

The present work studied the self-diffusion coefficient of 93Nb in Nb-doped TiO 2 single crystal (4.3 at.% Nb) at high oxygen activity [p(O 2)∈=∈21 kPa] over the temperature range 1,073 to 1,573 K. The diffusion-induced 93Nb concentration profile was determined by using secondary ion mass spectrometry (SIMS). The subsequently determined self-diffusion coefficient of 93Nb exhibits the following temperature dependence: 93Nb= 1.77 x10 -9m 2s -1 exp (- 197 +9kJml -1/RT. This study builds upon a similar study performed previouslyfor 93Nb tracer diffusion in undoped TiO 2, and identifies the effect of compositional change on self-diffusion behaviour. The obtained activation energy has been considered in terms of migration and formation enthalpies of titanium vacancies.

Original language	English
Pages (from-to)	1115-1121
Number of pages	7
Journal	Journal of Solid State Electrochemistry
Volume	13
Issue number	7
DOIs	https://doi.org/10.1007/s10008-008-0717-x
Publication status	Published - 2009

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title = "Niobium diffusion in niobium-doped titanium dioxide",

abstract = "The present work studied the self-diffusion coefficient of 93Nb in Nb-doped TiO 2 single crystal (4.3 at.% Nb) at high oxygen activity [p(O 2)∈=∈21 kPa] over the temperature range 1,073 to 1,573 K. The diffusion-induced 93Nb concentration profile was determined by using secondary ion mass spectrometry (SIMS). The subsequently determined self-diffusion coefficient of 93Nb exhibits the following temperature dependence: 93Nb= 1.77 x10 -9m 2s -1 exp (- 197 +9kJml -1/RT. This study builds upon a similar study performed previouslyfor 93Nb tracer diffusion in undoped TiO 2, and identifies the effect of compositional change on self-diffusion behaviour. The obtained activation energy has been considered in terms of migration and formation enthalpies of titanium vacancies.",

author = "Sheppard, {L. R.} and Atanacio, {A. J.} and T. Bak and J. Nowotny and Nowotny, {M. K.} and Prince, {K. E.}",

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doi = "10.1007/s10008-008-0717-x",

language = "English",

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TY - JOUR

T1 - Niobium diffusion in niobium-doped titanium dioxide

AU - Sheppard, L. R.

AU - Atanacio, A. J.

AU - Bak, T.

AU - Nowotny, J.

AU - Nowotny, M. K.

AU - Prince, K. E.

PY - 2009

Y1 - 2009

N2 - The present work studied the self-diffusion coefficient of 93Nb in Nb-doped TiO 2 single crystal (4.3 at.% Nb) at high oxygen activity [p(O 2)∈=∈21 kPa] over the temperature range 1,073 to 1,573 K. The diffusion-induced 93Nb concentration profile was determined by using secondary ion mass spectrometry (SIMS). The subsequently determined self-diffusion coefficient of 93Nb exhibits the following temperature dependence: 93Nb= 1.77 x10 -9m 2s -1 exp (- 197 +9kJml -1/RT. This study builds upon a similar study performed previouslyfor 93Nb tracer diffusion in undoped TiO 2, and identifies the effect of compositional change on self-diffusion behaviour. The obtained activation energy has been considered in terms of migration and formation enthalpies of titanium vacancies.

AB - The present work studied the self-diffusion coefficient of 93Nb in Nb-doped TiO 2 single crystal (4.3 at.% Nb) at high oxygen activity [p(O 2)∈=∈21 kPa] over the temperature range 1,073 to 1,573 K. The diffusion-induced 93Nb concentration profile was determined by using secondary ion mass spectrometry (SIMS). The subsequently determined self-diffusion coefficient of 93Nb exhibits the following temperature dependence: 93Nb= 1.77 x10 -9m 2s -1 exp (- 197 +9kJml -1/RT. This study builds upon a similar study performed previouslyfor 93Nb tracer diffusion in undoped TiO 2, and identifies the effect of compositional change on self-diffusion behaviour. The obtained activation energy has been considered in terms of migration and formation enthalpies of titanium vacancies.

UR - http://handle.uws.edu.au:8081/1959.7/553396

U2 - 10.1007/s10008-008-0717-x

DO - 10.1007/s10008-008-0717-x

M3 - Article

SN - 1432-8488

VL - 13

SP - 1115

EP - 1121

JO - Journal of Solid State Electrochemistry

JF - Journal of Solid State Electrochemistry

IS - 7

ER -

Niobium diffusion in niobium-doped titanium dioxide

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