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Synthesis and Structural Study of Pb2Re2O7−xPyrochlores

✍ Scribed by A.M Abakumov; R.V Shpanchenko; E.V Antipov; E.M Kopnin; J.J Capponi; M Marezio; O.I Lebedev; G Van Tendeloo; S Amelinckx

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
488 KB
Volume
138
Category
Article
ISSN
0022-4596

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✦ Synopsis

Pb 2 Re 2 O 7؊x have been synthesized in sealed evacuated silica tubes by a high-pressure, high-temperature technique. The products were characterized by X-ray powder and single-crystal diffraction, electron diffraction, energy-dispersive X-ray analysis, and thermogravimetric analysis. Anion-deficient pyrochlore-type structures of Pb 2 Re 2 O 6.65 and Pb 2 Re 2 O 6.75 were refined from X-ray powder data (a ‫؍‬ 10.4314(1) A > , space group Fd3 m, R I ‫؍‬ 0.027, R p ‫؍‬ 0.055) and single-crystal data (a ‫؍‬ 10.4239(3) A > , space group Fd3 m, R F ‫؍‬ 0.025, R w ‫؍‬ 0.036), respectively. Electron diffraction of the Pb 2 Re 2 O 6.65 oxide revealed a superstructure corresponding to a possible space group P3 m1 with cell parameters a h ‫؍‬ a c /(2+7.39 A > and c h ‫؍‬ 2a c (3+ 36.20 A > . A high-pressure-induced phase transition between the Pb 2 Re 2 O 7؊x pyrochlore and the Pb 6 Re 6 O 19 compound was found.

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