Relationship between Oxide-Ion Conduction and Dielectric Properties of Gd2Zr2O7Having a Fluorite-Type Structure

2008 ◽  
Vol 47 (7) ◽  
pp. 5521-5525 ◽  
Author(s):  
Hiroshi Yamamura ◽  
Hanako Nishino ◽  
Katsuyoshi Kakinuma
Keyword(s):  
Dielectric Properties ◽  
Type Structure ◽  
Ion Conduction ◽  
Fluorite Type ◽  
Oxide Ion Conduction ◽  
Oxide Ion

scholarly journals Effects of A-site nonstoichiometry on oxide ion conduction in 0.94Bi0.5Na0.5TiO3–0.06BaTiO3 ceramics

2016 ◽  
Vol 06 (02) ◽  
pp. 1650012 ◽  
Author(s):  
Sasiporn Prasertpalichat ◽  
Whitney Schmidt ◽  
David P. Cann
Keyword(s):  
Dielectric Properties ◽  
Electrical Properties ◽  
Perovskite Phase ◽  
Ion Conduction ◽  
Homogeneous Microstructure ◽  
Cubic Symmetry ◽  
A Site ◽  
Oxide Ion Conduction ◽  
Oxide Ion

Lead free 0.94(Bi[Formula: see text]Na[Formula: see text]TiO3–0.06BaTiO3 ceramics were prepared by conventional solid-state mixed oxide route with the A-site stoichiometry modified to incorporate donor-doping (through Bi-excess) and acceptor-doping (through Na-excess). Both stoichiometric and nonstoichiometric ceramics exhibited a single perovskite phase with pseudo-cubic symmetry. A significant improvement in the dielectric properties was observed in Bi-excess compositions and a deterioration in the dielectric properties was observed in Na-excess compositions. Impedance spectroscopy was utilized to analyze the effects of A-site nonstoichiometry on conduction mechanisms. Compositions with Bi-excess resulted in an electrically homogeneous microstructure with an increase in resistivity by [Formula: see text]3–4 orders of magnitude and an associated activation energy of 1.57[Formula: see text]eV which was close to half of the optical bandgap. In contrast, an electrically heterogeneous microstructure was observed in both the stoichiometric and Na-excess compositions. In addition, the Na-excess compositions exhibited low resistivities ([Formula: see text]-cm) with characteristic peaks in the impedance data comparable to the recent observations of oxide ion conduction in (Bi[Formula: see text]Na[Formula: see text]TiO3. Long term annealing studies were also conducted at 800[Formula: see text]C to identify changes in crystal structure and electrical properties. The results of this study demonstrates that the dielectric and electrical properties of 0.94(Bi[Formula: see text]Na[Formula: see text]TiO3–0.06BaTiO3 ceramics are very sensitive to Bi/Na stoichiometry.

Oxide-ion conduction via interstitials in scheelite-type LaNbO4: a first-principles study

2018 ◽  
Vol 6 (25) ◽  
pp. 12004-12011 ◽  
Author(s):  
Kazuaki Toyoura ◽  
Yusuke Sakakibara ◽  
Tatsuya Yokoi ◽  
Atsutomo Nakamura ◽  
Katsuyuki Matsunaga
Keyword(s):  
First Principles ◽  
First Principles Calculations ◽  
Ion Conduction ◽  
First Principles Study ◽  
Oxide Ion Conduction ◽  
Oxide Ion

The interstitial oxide-ion mechanism in scheelite-type lanthanum niobate has theoretically been analyzed using first-principles calculations.

Defect Structure and Oxide-ion Conduction in (La, Sr)2NiO4+δ with Layered Perovskite Structure

2020 ◽  
Vol 49 (9) ◽  
pp. 1071-1074
Author(s):  
Naoto Kitamura ◽  
Kakeru Ishizaki ◽  
Naoya Ishida ◽  
Yasushi Idemoto
Keyword(s):  
Defect Structure ◽  
Perovskite Structure ◽  
Layered Perovskite ◽  
Ion Conduction ◽  
Layered Perovskite Structure ◽  
Oxide Ion Conduction ◽  
Oxide Ion

Oxide ion conduction in La-doped PbWO4single crystals

2003 ◽  
Vol 15 (33) ◽  
pp. 5689-5695 ◽  
Author(s):  
Hongwei Huang ◽  
Xiqi Feng ◽  
Wenliang Zhu ◽  
Yan Zhang ◽  
Ting-Lian Wen ◽  
...  
Keyword(s):  
Ion Conduction ◽  
Oxide Ion Conduction ◽  
La Doped ◽  
Oxide Ion

Oxide Ion Conduction in Indium-Oxide-Substituted Calcium Zirconate

2006 ◽  
Vol 153 (10) ◽  
pp. H189 ◽  
Author(s):  
M. P. Hills ◽  
C. Schwandt ◽  
R. V. Kumar
Keyword(s):  
Indium Oxide ◽  
Calcium Zirconate ◽  
Ion Conduction ◽  
Oxide Ion Conduction ◽  
Oxide Ion
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