کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1298320 | 1498396 | 2007 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Relationship between oxide-ion conductivity and ordering of oxide ion in the (Y1−xLax)2(Ce1−xZrx)2O7 system with pyrochlore-type composition Relationship between oxide-ion conductivity and ordering of oxide ion in the (Y1−xLax)2(Ce1−xZrx)2O7 system with pyrochlore-type composition](/preview/png/1298320.png)
The relationship between oxide-ion conductivity and ordering of oxide ion in the (Y1−xLax)2(Ce1−xZrx)2O7 system having a pyrochlore-type composition was investigated. The crystal phase of the system with a variable cation radius ratio, but with a constant lattice parameter, changed from a rare-earth-C (C)-type phase to a pyrochlore (P)-type phase through a fluorite (F)-type phase with increase in the composition (x), depending on the cation radius ratio r(A3+)/r(B4+), which is a measure of ordering degree of oxygen vacancies. The oxide-ion conductivity increased once up to x = 0.15, and then decreased with increasing x. This change of the electrical conductivity was understood on the basis of the ordering degree of oxide ion. The Rietveld analyses of X-ray and neutron diffraction patterns, and Raman spectroscopy supported the ordering effect of oxide ion on the conductivity.
Journal: Solid State Ionics - Volume 178, Issues 3–4, February 2007, Pages 233–238