✦ LIBER ✦

Structural Properties and Thermal Stability of Bi8Pb5O17Fast Ion Conducting Phases

✍ Scribed by Monica Santarosa; Lara Righi; Mauro Gemmi; Adolfo Speghini; Andrea Migliori; Gianluca Calestani; Marco Bettinelli

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 377 KB
Volume: 144
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8211

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✦ Synopsis

Samples with Bi 8 Pb 5 O 17 stoichiometry were synthesized by ceramic techniques at temperatures ranging from 200 to 6403C. Their structural properties and relative stabilities were investigated using X-ray and electron di4raction, di4erential scanning calorimetry, and Raman spectroscopy. The tetragonal 2 phase is described by an incommensurately modulated structure, whose modulation depends on the 5ring temperature. Heat treatments in the 200+3003C range lead to the formation of a new tetragonal phase, , which is converted back to 2 above 3003C. The intermediate phase can be obtained without the previous formation of 2 , and its X-ray powder di4raction pattern is indexed using a triclinic cell. The present data suggest that the 2 phase is the low-temperature polymorph of this composition.

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