Structure and conductivity of pyrochlore and fluorite type solid solutions
نویسندگان
چکیده
منابع مشابه
Structure and Conductivity of Pyrochlore and Fluorite Type Solid Solutions
High oxygen conductivities can be achieved in cation ordered LnxZrl_=O2_l x (Ln=Gd, Nd) solid solutions with pyrochlore (P) structure. High values of the pre-exponentlal factor °o are correlated with the degree of anion disorder in the 8b oxygen sublattice (neutron diffraction). The activation energy AH is lowered by cation ordering (F-P transition; effect of x) due to the occurence of a prefer...
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The effect of pyrochlore order in solid solutions with the defect fluorite structure was studied. The amount of order was changed by various heat treatments or by varying the cation composition. Examples of short range order and microdomainformation have been observed in Tb2Zr207+x and Gd2Zr207. Pyrochlore order results in a decrease of the activation enthalpy and pre-exponential factor for oxy...
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Craig Bryan,1 Catherine A. Whitman,1,2 Michel B. Johnson,2 John F. Niven,3 Patrick Murray,1 Alex Bourque,1,2 Hanna A. Dąbkowska,4 Bruce D. Gaulin,4,5 and Mary Anne White1,2,3,* 1Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4R2 2Institute for Research in Materials, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4R2 3Department of Physics and Atmospheric...
متن کاملElectrical and Catalytic Properties of Some Oxides with the Fluorite or Pyrochlore Structure Part I: Synthesis, Characterization and Conductivity
In view of their possible use as electrocatalysts, several oxides with the fluorite or pyrochlore structure were investigated. Part I of this paper deals with the synthesis, characterization and electrical conductivity of these materials. All lanthanide titanates investigated (partly doped with Bi) show the pyrochlore structure and are poor conductors, except for the compounds containing Tb. Fo...
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ژورنال
عنوان ژورنال: Solid State Ionics
سال: 1981
ISSN: 0167-2738
DOI: 10.1016/0167-2738(81)90306-4