Ferroelectric glass-ceramics from the PbO-GeO2-Nb2O5 system
UNSPECIFIED. (2004) Ferroelectric glass-ceramics from the PbO-GeO2-Nb2O5 system. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 24 (10-11). pp. 2951-2958. ISSN 0955-2219Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2003.11.0...
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|
|Number of Pages:||8|
|Page Range:||pp. 2951-2958|
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