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Processing and electrical properties of Pb0.6Ba0.4Nb2O6 ceramics

Published online by Cambridge University Press:  31 January 2011

Sinan Dursun  and
Cihangir Duran
Sinan Dursun
Affiliation:
Gebze Institute of Technology, Department of Materials Science and Engineering, 41400 Gebze/Kocaeli, Turkey
Cihangir Duran*
Affiliation:
Gebze Institute of Technology, Department of Materials Science and Engineering, 41400 Gebze/Kocaeli, Turkey
*
a)Address all correspondence to this author. e-mail: cduran@gyte.edu.tr
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Abstract

Lead barium niobate (PBN or PbxBa1–xNb2O6) is a promising tungsten bronze ceramic system that has a morphotropic phase boundary between the orthorhombic and tetragonal phases at x ≈ 0.63, where the spontaneous polarization (Ps ≈ 60–70 μC/cm2) and other ferroelectric properties are known to be higher. However, even textured PBN60 ceramics have low Ps (∼23.9 μC/cm2) and piezoelectric charge coefficient (d33 ≈ 236 pC/N) as compared to the single crystal counterparts. The aim of this study is to control powder processing, green body formation, and sintering conditions to enhance both densification and electrical properties. Therefore, samples were prepared by tape casting methods using single phase PBN60 and reactive mixture of PbNb2O6 and BaNb2O6 powders. Three wt% excess PbO was found to be necessary for densification. Our results showed that undoped PBN60 ceramics reached Ps = 33 μC/cm2, d33 = 305 pC/N, and had a Tc = 340–350 °C. These results are much higher than the reported values in the literature, which can be attributed to the careful ceramic processing such as tape casting (e.g., homogenous green structure), annealing (e.g., control of excess grain boundary phase), and liquid phase sintering (e.g., higher densification).

Keywords

SinteringDielectric propertiesPiezoelectric
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 11 , November 2010 , pp. 2143 - 2149
Copyright
Copyright © Materials Research Society 2010

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