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18Oxygen diffusion in polycrystalline lead lanthanum zirconate titanate

Hummelt, Stefan and Flege, Stefan and Ensinger, Wolfgang (2010):
18Oxygen diffusion in polycrystalline lead lanthanum zirconate titanate.
4, In: physica status solidi (RRL) - Rapid Research Letters, (8-9), pp. 203-205. WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, ISSN 18626254,
[Article]

Abstract

18O oxygen tracer diffusion coefficients and activation energies were determined in polycrystalline PLZT (lead lanthanum zirconate titanate) with varying La concentration in the temperature range of 500 °C to 800 °C. For this purpose the isotope exchange method and Secondary Ion Mass Spectrometry (SIMS) depth profiling were used. As a novel approach a chemically reduced sample was prepared by anneal- ing at low oxygen partial pressure (p (O2) ≈ 10–13 Pa). Subsequently the sample was thermally charged with 18O, too. Results indicate a higher diffusion rate in the reduced sample than in as-received PLZT thus leading to the assumption that the diffusion mechanism in PLZT is vacancy driven despite the strong donor doping of the perovskite lattice.

Item Type: Article
Erschienen: 2010
Creators: Hummelt, Stefan and Flege, Stefan and Ensinger, Wolfgang
Title: 18Oxygen diffusion in polycrystalline lead lanthanum zirconate titanate
Language: English
Abstract:

18O oxygen tracer diffusion coefficients and activation energies were determined in polycrystalline PLZT (lead lanthanum zirconate titanate) with varying La concentration in the temperature range of 500 °C to 800 °C. For this purpose the isotope exchange method and Secondary Ion Mass Spectrometry (SIMS) depth profiling were used. As a novel approach a chemically reduced sample was prepared by anneal- ing at low oxygen partial pressure (p (O2) ≈ 10–13 Pa). Subsequently the sample was thermally charged with 18O, too. Results indicate a higher diffusion rate in the reduced sample than in as-received PLZT thus leading to the assumption that the diffusion mechanism in PLZT is vacancy driven despite the strong donor doping of the perovskite lattice.

Journal or Publication Title: physica status solidi (RRL) - Rapid Research Letters
Volume: 4
Number: 8-9
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Uncontrolled Keywords: diffusion; oxygen vacancies; ferroelectrics; electro-optics; perovskite materials
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 12 Dec 2012 10:04
Official URL: http://dx.doi.org/10.1002/pssr.201004182
Identification Number: doi:10.1002/pssr.201004182
Funders: Funded by Deutsche Forschungsgemeinschaft (DFG) and Department of Materials Science of the Technische Universität Darmstadt, Germany
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