Novel Y2−xPrxRu2O7 (x=0–2) Pyrochlore Oxides Prepared Using a Soft Chemistry Route and their Electrical Properties
Y2−xPrxRu2O7 (0≤x≤2) pyrochlore powders were prepared using a precipitation method, which allowed control of their composition and morphology. Materials structure and morphology were characterized by X-ray diffraction analysis and field emission scanning electron microscopy, respectively. All the synthesized powders exhibited a single pyrochlore phase with particle size depending on the Pr content. Powders with Pr content smaller than 25 mol% were nanometric. X-ray photoelectron spectroscopy analysis revealed a mixed oxidation state of both Pr and Ru, and a variation of the oxidation state of the elements in response to oxygen partial pressure changes. Electrical conductivity measurements were performed by dc 4-probe method at several temperatures, showing that increasing the Pr content in the A site of the pyrochlore structure increased the oxide electrical conductivity.
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Document Type: Research Article
Dipartimento di Scienze e Tecnologie Chimiche,Università di Roma “Tor Vergata” 00133, Roma, Italy
Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611
Department of Physical Methods and Materials, ENEA, Research Centre of Casaccia, 00123 Rome, Italy
Publication date: 2010-07-01