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Influence of reducing atmosphere on the defect chemistry of lead lanthanum zirconate titanate (8/65/35)

Schaab, S. and Schulz, M. and Fritze, H. and Eichel, R.-A. and Erdem, E. and Rüscher, C. H. and Hummelt, S. and Granzow, T. (2012):
Influence of reducing atmosphere on the defect chemistry of lead lanthanum zirconate titanate (8/65/35).
In: Solid State Ionics, pp. 56-63, 228, ISSN 01672738,
[Online-Edition: http://dx.doi.org/10.1016/j.ssi.2012.09.003],
[Article]

Abstract

The defect structure of lanthanum-modified lead-zirconate-titanate (PLZT) is altered by annealing at 700 °C in different reducing atmospheres and studied by conductivity measurements, different spectroscopic techniques and determination of the thermally stimulated depolarization current (TSDC). It is found that annealing at an oxygen partial pressure of pO2<10−16 bar leads to the formation of oxygen vacancies VO• • or VO×. If hydrogen is present in the reducing atmosphere, it can be incorporated as either HO• or OHO•. The defects can be evidenced in both the IR and UV/VIS absorption spectra. Additionally, high levels of reduction cause a shift in the Fermi level, leading to the population of intrinsic Fe impurities, which can possibly be utilized as photorefractive centers.

Item Type: Article
Erschienen: 2012
Creators: Schaab, S. and Schulz, M. and Fritze, H. and Eichel, R.-A. and Erdem, E. and Rüscher, C. H. and Hummelt, S. and Granzow, T.
Title: Influence of reducing atmosphere on the defect chemistry of lead lanthanum zirconate titanate (8/65/35)
Language: English
Abstract:

The defect structure of lanthanum-modified lead-zirconate-titanate (PLZT) is altered by annealing at 700 °C in different reducing atmospheres and studied by conductivity measurements, different spectroscopic techniques and determination of the thermally stimulated depolarization current (TSDC). It is found that annealing at an oxygen partial pressure of pO2<10−16 bar leads to the formation of oxygen vacancies VO• • or VO×. If hydrogen is present in the reducing atmosphere, it can be incorporated as either HO• or OHO•. The defects can be evidenced in both the IR and UV/VIS absorption spectra. Additionally, high levels of reduction cause a shift in the Fermi level, leading to the population of intrinsic Fe impurities, which can possibly be utilized as photorefractive centers.

Journal or Publication Title: Solid State Ionics
Volume: 228
Uncontrolled Keywords: PLZT; Reduction treatment; Hydrogen defects; Oxygen vacancies
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 23 Oct 2012 09:27
Official URL: http://dx.doi.org/10.1016/j.ssi.2012.09.003
Identification Number: doi:10.1016/j.ssi.2012.09.003
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