Preparation of high-oxygen-content apatite silicates through Ti-doping: Effect of Ti-doping on the oxide ion conductivity

Ahmed Al-Yasari, Alison Jones, Alodia Orera, David C Apperley, Dan Driscoll, M Saiful Islam, Peter R Slater

Research output: Contribution to journalArticle

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Abstract

In this paper we show that through Ti-doping it is possible to synthesise high-oxygen-content silicate-based apatites, La10Si 6-xTixO27 (0.25 ≤ x ≤ 2.0), and report conductivity data for this series. The results show that Ti-doping leads to a general decrease in the conductivity, and an increase in activation energy, particularly for the range 1.0 ≤ x ≤ 2.0. With reference to computer modelling and 29Si NMR data, this decrease in conductivity is attributed to trapping of the interstitial oxide ions around the Ti dopant. Attempts to prepare similar compositions containing La cation vacancies, i.e. La10-ySi6-xTixO3-3y/2, have a tendency to result in La2Ti2O7 impurities, particularly for high values of y.
LanguageEnglish
Pages5003-5008
Number of pages6
JournalJournal of Materials Chemistry
Volume19
Issue number28
DOIs
StatusPublished - 28 Jul 2009

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Silicates
Apatites
Apatite
Oxides
Doping (additives)
Ions
Oxygen
Vacancies
Cations
Activation energy
Positive ions
Nuclear magnetic resonance
Impurities
Chemical analysis

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Preparation of high-oxygen-content apatite silicates through Ti-doping: Effect of Ti-doping on the oxide ion conductivity. / Al-Yasari, Ahmed; Jones, Alison; Orera, Alodia; Apperley, David C; Driscoll, Dan; Islam, M Saiful; Slater, Peter R.

In: Journal of Materials Chemistry, Vol. 19, No. 28, 28.07.2009, p. 5003-5008.

Research output: Contribution to journalArticle

Al-Yasari, Ahmed ; Jones, Alison ; Orera, Alodia ; Apperley, David C ; Driscoll, Dan ; Islam, M Saiful ; Slater, Peter R. / Preparation of high-oxygen-content apatite silicates through Ti-doping: Effect of Ti-doping on the oxide ion conductivity. In: Journal of Materials Chemistry. 2009 ; Vol. 19, No. 28. pp. 5003-5008.
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AU - Apperley, David C

AU - Driscoll, Dan

AU - Islam, M Saiful

AU - Slater, Peter R

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