Abstract
In this work, semiconductive oxide prepared by PbTiO3-coated SrTiO3 powders and processed by conventional sintering (CS), rapid thermal sintering (RTS) and microwave sintering (MS) techniques, were examined using TEM, EDS and X-ray diffraction to evaluate the core-shell structure evolution. Results show that microstructural characteristics of the specimens vary for different sintering processes. XRD patterns imply that CS specimens are tetragonal with high c/a ratio, MS specimens are nearly cubic and RTS specimens possess medium tetragonality. Detail investigations indicate that MS specimens show a high Pb-content thin shell and a core with lower Pb concentration. CS and RTS specimens exhibit a core with higher Pb-content and a shell with smaller concentration gradient due to atomic diffusion. Therefore more complicated internal structures were produced in CS and RTS specimens because of higher tetragonality. The present experiment implies that the PTCR properties of (Pb,Sr)TiO3 materials can be monitored through appropriate powder preparation and sintering processes.
Published Version
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