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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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:	Date Event September 2004 UNSPECIFIED
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

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