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Processing and characterization of lead magnesium tantalate ceramics

Published online by Cambridge University Press:  26 July 2012

Mehmet A. Akbas  and
Peter K. Davies
Mehmet A. Akbas
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104–6272
Peter K. Davies
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104–6272
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Abstract

Using a processing route that employed platinum crucibles, single phase ceramics of Pb(Mg1/3Ta2/3)O3 (PMT) relaxor ferroelectrics were prepared with densities greater than 95% of their theoretical value. The improvements in the sintering characteristics of this system that result from this route were reflected by the dielectric properties, at 182 K, which are similar to those reported for single crystal PMT. Contrast originating from nanosized polar clusters was evident in dark-field TEM images collected from the PMT ceramics at room temperature and showed little change upon cooling through the permittivity maximum. The electron diffraction patterns contained weak superlattice reflections at (h ± 1/2, k ± 1/2, l ± 1/2) that originate from a 1: 1 ordering of the B-site cations. High resolution imaging indicated that the length scale of the chemical ordering in PMT is essentially identical to niobate relaxors such as PMN, with the 1–2 nm ordered domains being surrounded by a disordered matrix.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 10 , October 1997 , pp. 2617 - 2622
Copyright
Copyright © Materials Research Society 1997

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