Structure and ionic conductivity of Bi2O3 substituted with lanthanide oxides |
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| Authors: | MJ Verkerk GMH van de Velde AJ Burggraaf RB Helmholdt |
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| Institution: | Twente University of Technology, Department of Chemical Engineering, Laboratory of Inorganic Materials Science, P.O. Box 217, 7500 AE Enschede, The Netherlands;Netherlands Energy Research Foundation ECN, P.O. Box 1, 1755 ZG Petten, The Netherlands |
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| Abstract: | A neutron diffraction study was performed on (Bi2O3)O.80(Er2O3)0.20 in the temperature region of 300–1100 K. There is no long-range ordering of vacancies. It is concluded from diffuse scattering that at low temperatures short-range ordering appears, leading to the occurrence of relatively short Ln-O distances. At temperatures above 870 K the oxygen lattice disorders.In the low temperature region of Bi2O3-Ln2O3 solid solutions with the δ-Bi2O3 structure the activation energy of the conductivity is determined by the strength of the Ln-O band. In the high temperature region the energy necessary for oxygen ions to migrate through the tetrahedron planes plays a role. |
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