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Title: Electrical properties and water incorporation in A-site deficient perovskite La{sub 1−x}Ba{sub x}Nb{sub 3}O{sub 9−0.5x}

Abstract

Barium doped A-site deficient perovskites La{sub 1−x}Ba{sub x}Nb{sub 3}O{sub 9−0.5x} (x=0–0.05) were synthesized by the solid state method, their structure, electrical properties and state of oxygen-hydrogen groups have been investigated. These phases were found to be able to incorporate water from the gas phase and to exhibit proton transport. Hydration is accompanied by the formation of different forms of oxygen-hydrogen groups: OH{sup −} – groups and H{sub 3}O{sup +} – ions. The total conductivities of doped samples increased in a wet atmosphere due to the appearance of proton current carriers (at the temperatures below 700 °C), but the conductivity increased insignificantly (~0.25 order of magnitude) because of a low doping level and, consequently, small concentration of protons. TG-measurements confirmed relatively low water content (below 0.2%). The total conductivity depends substantially on x and exhibits a minimum on σ−f(x) dependencies. It has been suggested that such behavior is a manifestation of a mixed cation effect. - Highlights: • Barium doped perovskites La{sub 1−x}Ba{sub x}Nb{sub 3}O{sub 9−0.5x} (x=0–0.05) are capable to incorporate water from the gas phase and to exhibit proton transport. • The hydration is accompanied by the formation of OH{sup −} – groups and H{sub 3}O{sup +} – ions. •more » The total conductivity exhibits a minimum on σ−f(x) dependencies as a result of a mixed cation effect.« less

Authors:
 [1];  [2];  [1]
  1. Institute of Natural Sciences, Ural Federal University, 19 Mira Street, Ekaterinburg (Russian Federation)
  2. Laboratory SPMS Structures, Properties and Modeling of Solids, Ecole CentraleSupélec, Grande Voie des Vignes, Châtenay-Malabry, 92290 Paris (France)
Publication Date:
OSTI Identifier:
22584114
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 238; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BARIUM; BARIUM COMPLEXES; CATIONS; CONCENTRATION RATIO; DOPED MATERIALS; ELECTRICAL PROPERTIES; HUMIDITY; HYDRATION; HYDROGEN; LANTHANUM COMPLEXES; NIOBIUM OXIDES; OXONIUM IONS; OXYGEN; PEROVSKITE; PROTON TRANSPORT; PROTONS; RAMAN SPECTROSCOPY; SOLIDS; WATER

Citation Formats

Animitsa, I., E-mail: irina.animitsa@urfu.ru, Iakovleva, A., and Belova, K. Electrical properties and water incorporation in A-site deficient perovskite La{sub 1−x}Ba{sub x}Nb{sub 3}O{sub 9−0.5x}. United States: N. p., 2016. Web. doi:10.1016/J.JSSC.2016.03.023.
Animitsa, I., E-mail: irina.animitsa@urfu.ru, Iakovleva, A., & Belova, K. Electrical properties and water incorporation in A-site deficient perovskite La{sub 1−x}Ba{sub x}Nb{sub 3}O{sub 9−0.5x}. United States. doi:10.1016/J.JSSC.2016.03.023.
Animitsa, I., E-mail: irina.animitsa@urfu.ru, Iakovleva, A., and Belova, K. 2016. "Electrical properties and water incorporation in A-site deficient perovskite La{sub 1−x}Ba{sub x}Nb{sub 3}O{sub 9−0.5x}". United States. doi:10.1016/J.JSSC.2016.03.023.
@article{osti_22584114,
title = {Electrical properties and water incorporation in A-site deficient perovskite La{sub 1−x}Ba{sub x}Nb{sub 3}O{sub 9−0.5x}},
author = {Animitsa, I., E-mail: irina.animitsa@urfu.ru and Iakovleva, A. and Belova, K.},
abstractNote = {Barium doped A-site deficient perovskites La{sub 1−x}Ba{sub x}Nb{sub 3}O{sub 9−0.5x} (x=0–0.05) were synthesized by the solid state method, their structure, electrical properties and state of oxygen-hydrogen groups have been investigated. These phases were found to be able to incorporate water from the gas phase and to exhibit proton transport. Hydration is accompanied by the formation of different forms of oxygen-hydrogen groups: OH{sup −} – groups and H{sub 3}O{sup +} – ions. The total conductivities of doped samples increased in a wet atmosphere due to the appearance of proton current carriers (at the temperatures below 700 °C), but the conductivity increased insignificantly (~0.25 order of magnitude) because of a low doping level and, consequently, small concentration of protons. TG-measurements confirmed relatively low water content (below 0.2%). The total conductivity depends substantially on x and exhibits a minimum on σ−f(x) dependencies. It has been suggested that such behavior is a manifestation of a mixed cation effect. - Highlights: • Barium doped perovskites La{sub 1−x}Ba{sub x}Nb{sub 3}O{sub 9−0.5x} (x=0–0.05) are capable to incorporate water from the gas phase and to exhibit proton transport. • The hydration is accompanied by the formation of OH{sup −} – groups and H{sub 3}O{sup +} – ions. • The total conductivity exhibits a minimum on σ−f(x) dependencies as a result of a mixed cation effect.},
doi = {10.1016/J.JSSC.2016.03.023},
journal = {Journal of Solid State Chemistry},
number = ,
volume = 238,
place = {United States},
year = 2016,
month = 6
}