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18Oxygen diffusion in polycrystalline lead lanthanum zirconate titanate

Hummelt, Stefan ; Flege, Stefan ; Ensinger, Wolfgang (2010)
18Oxygen diffusion in polycrystalline lead lanthanum zirconate titanate.
In: physica status solidi (RRL) - Rapid Research Letters, 4 (8-9)
doi: 10.1002/pssr.201004182
Article, Bibliographie

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 ; Flege, Stefan ; Ensinger, Wolfgang
Type of entry: Bibliographie
Title: 18Oxygen diffusion in polycrystalline lead lanthanum zirconate titanate
Language: English
Date: September 2010
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Journal or Publication Title: physica status solidi (RRL) - Rapid Research Letters
Volume of the journal: 4
Issue Number: 8-9
DOI: 10.1002/pssr.201004182
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.

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
Last Modified: 05 Mar 2013 10:04
PPN:
Funders: Funded by Deutsche Forschungsgemeinschaft (DFG) and Department of Materials Science of the Technische Universität Darmstadt, Germany
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