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Ferroelectric glass-ceramics from the PbO-GeO2-Nb2O5 system

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UNSPECIFIED (2004) Ferroelectric glass-ceramics from the PbO-GeO2-Nb2O5 system. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 24 (10-11). pp. 2951-2958. doi:10.1016/j.jeurceramsoc.2003.11.017

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Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2003.11.0...

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Abstract

Glass-ceramics with compositions Pb5Ge3O11-xPbNb2O6 (PG-xPN) where x equals 0.0, 0.5, 1, 2 and 3, and other selected compositions from the PbO-GeO2-Nb2O5 system, have been prepared using the conventional melt-quench method. Most of the quenched melts devitrified on cooling and gave fragile samples. The x = 0.5 (PGN2) sample formed a robust solid which contained the ferroelectric phase Pb5Ge3O11 and the pyrochlore phase Pb2Nb2O7. Glass formation was improved by replacing some Nb2O5 by GeO2. Scanning electron micrographs of cross-sections of the x=0.5 sample showed surface crystallisation of the PG phase with a-axis orientation. The PN phase was distributed randomly in the sample. Heating the sample at 667 C for 48 h enhanced the surface orientation of this PG phase. After poling the heat treated sample, using an electric field of up to 25 kV/cm, a ferroelectric hysteresis loop could be obtained at room temperature with Ps= 1 muC/cm(2). The Curie point of this PGN2 sample was found to be similar to166 degreesC. (C) 2003 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Subjects: T Technology > TP Chemical technology
Journal or Publication Title: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Publisher: ELSEVIER SCI LTD
ISSN: 0955-2219
Official Date: September 2004
Dates:
DateEvent
September 2004UNSPECIFIED
Volume: 24
Number: 10-11
Number of Pages: 8
Page Range: pp. 2951-2958
DOI: 10.1016/j.jeurceramsoc.2003.11.017
Publication Status: Published

Data sourced from Thomson Reuters' Web of Knowledge

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