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Oxygen vacancy kinetics in ferroelectric PbZr[sub 0.4]Ti[sub 0.6]O[sub 3]

Gottschalk, S. and Hahn, H. and Flege, S. and Balogh, A. G. (2008):
Oxygen vacancy kinetics in ferroelectric PbZr[sub 0.4]Ti[sub 0.6]O[sub 3].
In: Journal of Applied Physics, American Institute of Physics, p. 114106, 104, (11), ISSN 00218979,
[Online-Edition: http://dx.doi.org/10.1063/1.2988902],
[Article]

Abstract

Oxygen vacancy kinetics in ferroelectric PbZr0.4Ti0.6O3 were studied by 18oxygen (18O) tracer self-diffusion in epitaxial thin films as well as bulk polycrystalline samples. 18O exchange annealing was carried out at an oxygen partial pressure of 250 mbar and temperatures between 250 and 400 °C. Isotope depth profiling was performed by secondary ion mass spectrometry as well as neutral secondary mass spectrometry. The observed concentration depth profiles of the polycrystalline samples show two distinct diffusion paths, namely, bulk diffusion and grain boundary (GB) diffusion. It appears to be of type B-kinetics in the investigated temperature range, with DGB/Dbulk⪢100. Donor doped samples with different levels of Nb5+ (1–4 mol. %) were also investigated. The effect on the diffusion depth profiles, however, were negligible and can solely be attributed due to the change in the samples microstructure as induced by the dopants. A diffusion coefficient for the bulk diffusion of the 18O isotope, Dbulk = 10±5×10−8 cm2/s exp(−0.87±0.1 eV/kT) was found. The faster GB diffusion process shows an activation enthalpy of only EA = 0.66±0.2 eV.

Item Type: Article
Erschienen: 2008
Creators: Gottschalk, S. and Hahn, H. and Flege, S. and Balogh, A. G.
Title: Oxygen vacancy kinetics in ferroelectric PbZr[sub 0.4]Ti[sub 0.6]O[sub 3]
Language: English
Abstract:

Oxygen vacancy kinetics in ferroelectric PbZr0.4Ti0.6O3 were studied by 18oxygen (18O) tracer self-diffusion in epitaxial thin films as well as bulk polycrystalline samples. 18O exchange annealing was carried out at an oxygen partial pressure of 250 mbar and temperatures between 250 and 400 °C. Isotope depth profiling was performed by secondary ion mass spectrometry as well as neutral secondary mass spectrometry. The observed concentration depth profiles of the polycrystalline samples show two distinct diffusion paths, namely, bulk diffusion and grain boundary (GB) diffusion. It appears to be of type B-kinetics in the investigated temperature range, with DGB/Dbulk⪢100. Donor doped samples with different levels of Nb5+ (1–4 mol. %) were also investigated. The effect on the diffusion depth profiles, however, were negligible and can solely be attributed due to the change in the samples microstructure as induced by the dopants. A diffusion coefficient for the bulk diffusion of the 18O isotope, Dbulk = 10±5×10−8 cm2/s exp(−0.87±0.1 eV/kT) was found. The faster GB diffusion process shows an activation enthalpy of only EA = 0.66±0.2 eV.

Journal or Publication Title: Journal of Applied Physics
Volume: 104
Number: 11
Publisher: American Institute of Physics
Uncontrolled Keywords: annealing, enthalpy, epitaxial layers, ferroelectric thin films, grain boundary diffusion, lead compounds, self-diffusion, vacancies (crystal), zirconium compounds
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation > Subproject B2: Investigations of the defect structure and diffusion in ferroelectric materials
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 10 Dec 2012 09:06
Official URL: http://dx.doi.org/10.1063/1.2988902
Additional Information:

SFB 595 B2

Identification Number: doi:10.1063/1.2988902
Funders: Financial support by the Deutsche Forschungsgemeinschaft (DFG) in the framework of Sonderforschungsbereich (SFB) Grant No. 595 is highly appreciated.
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