Microstructures and properties of semi-conductive Pb0.6Sr0.4TiO3 ceramics using PbTiO3-coated SrTiO3 powders
Journal
Journal of the European Ceramic Society
Journal Volume
21
Journal Issue
10-11
Pages
1905-1908
Date Issued
2001
Author(s)
Abstract
Microstructures and properties of semi-conductive Pb0.6Sr0.4TiO3 ceramics fabricated from PbTiO3-coated SrTiO3 powders were investigated using X-ray and electron diffraction, transmission electron microscopy and energy dispersive spectroscopy. PbTiO3-coated SrTiO3 powders were prepared for simulating the core-shell structure in Pb0.6Sr0.4TiO3 ceramics, which were sintered by microwave, rapid thermal and conventional sintering processes. After TEM investigations and EDS analyses, it is found that the microwave-sintered specimens preserve the starting core-shell structure more effectively than the conventional and rapid thermal sintered specimens. According to our core-shell model, the microwave-sintered specimens show single Tc and the conventional, rapid thermal sintered specimens exhibit double Tc behavior, as verified by the resistivity-temperature (ρ-T) properties. Our interpretation implies that the core-shell structure may be the primary factor affecting the ρ-T properties. © 2001 Elsevier Science Ltd. All rights reserved.
SDGs
Type
journal article