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Synthesis, Electrical Properties, and Powder Neutron Crystal Structure Refinement of Pb1−xBixPt2O4 Compounds (0≤x≤0.3)

✍ Scribed by S. Obbade; N. Tancret; F. Abraham; E. Suard

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
396 KB
Volume
166
Category
Article
ISSN
0022-4596

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✦ Synopsis

Substitution of Pb for Bi in the recently characterized mixedvalence lead+platinum oxide PbPt 2 O 4 was attempted and a Pb 1؊x Bi x Pt 2 O 4 solid solution was obtained for 04x40.3. Powder X-ray di4raction study showed that all substituted compounds crystallize with similar triclinic unit cell and PbPt 2 O 4 lattice parameters. The structural model of Pb 0.7 Bi 0.3 Pt 2 O 4 was re5ned from powder X-ray di4raction data using the Rietveld method and the results indicate the same crystal structure than PbPt 2 O 4 with one mixed Pb/Bi atomic site. Neutron di4raction realized on the two limit compositions of the solid solution (x ‫؍‬ 0 and 0.3) allowed to con5rm the PbPt 2 O 4 and Pb 0.7 Bi 0.3 Pt 2 O 4 stoichiometries. Mean oxidation degree of Pt atoms in the [PtO 4 ] in5nite chains decreases from ؉ 3 for PbPt 2 O 4 to ؉ 2.7 for Pb 0.7 Bi 0.3 Pt 2 O 4 . Conductivity measurements show a metallic behavior for all the compositions except the limit composition x ‫؍‬ 0.3 for which a semiconducting behavior appears. 2002 Elsevier Science (USA)

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