Ionic conductivity of Dion-Jacobson type oxide LiLaTa2O7 and oxynitride LiLaTa2O6.15N0.57 measured by impedance spectroscopy

Title
Ionic conductivity of Dion-Jacobson type oxide LiLaTa2O7 and oxynitride LiLaTa2O6.15N0.57 measured by impedance spectroscopy
Author(s)
김영일김승주[김승주]
Keywords
DIELECTRIC-PROPERTIES; RUDDLESDEN-POPPER; CRYSTAL-STRUCTURE; PEROVSKITES; PHOTOCATALYST; LI2LA2/3TA2O7; LI2LATA2O6N; ORIGIN
Issue Date
201503
Publisher
ELSEVIER SCI LTD
Citation
CERAMICS INTERNATIONAL, v.41, no.2, pp.3318 - 3323
Abstract
Ionic transport in the layered perovskite, LiLaTa2O7, and its oxynitride derivative, LiLaTa2O6.15N0.57, were examined by ac impedance spectroscopy in a N-2 atmosphere. Non-Arrhenius behavior was observed when LiLaTa2O7 was heated from 30 degrees C to 70 degrees C with the conductivity decreasing from 10(-5.9) S/cm to 10(-6.3) S/cm, due to the heat-induced removal of interlayer water. The conductivity of dehydrated LiLaTa2O7 then increased monotonously from 10(-6.3) S/cm at 80 degrees C to 10(-3.7) S/cm at 283 degrees C with an activation energy (E-a) of 0.54 eV. Compared to LiLaTa2O7, the oxynitride phase, LiLaTa2O6.15N0.57, exhibited much lower conductivity ranging from 10(-6.7) S/cm at 315 degrees C to 10(-5.5) S/cm at 496 degrees C with an E-a of 0.57 eV. The distinct ionic conductivity among the similar layered perovskites, LiLaTa2O7, LiLaTa2O6.15N0.57, Li2La2/3Ta2O7, and Li2LaTa2O6N, highlights the importance of structural factors on the ionic conductivity, particularly, the site occupancy of the mobile cation, Li+, and the connectivity of the anion sublattice. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/33101http://dx.doi.org/10.1016/j.ceramint.2014.10.122
ISSN
0272-8842
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이과대학 > 화학생화학부 > Articles
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