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Dependence of critical radius of the cubic perovskite ABO3 oxides on the radius of A- and B-site cations

✍ Scribed by Nansheng Xu; Hailei Zhao; Xiong Zhou; Wenjing Wei; Xionggang Lu; Weizhong Ding; Fushen Li

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
795 KB
Volume
35
Category
Article
ISSN
0360-3199

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✦ Synopsis

Critical radius (r C ) for cubic perovskite structure is an important factor affecting the migration energy of oxygen ions. The monotonic dependence of the critical radius on the ionic radii of A-and B-site cations in cubic perovskite ABO 3 structure was systematically investigated by strict mathematical derivation. When the tolerance factor (t) < 1, the critical radius is a decreasing function but an increasing function with respect to the radius of A-site cation (r A ) and B-site cation (r B ), respectively. For the case of t > 1, there is a reverse dependence of r C on r A and r B . With respect to the case of t ΒΌ 1, r C displays a decreasing function with respect to both r A and r B .

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