ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
In this work, we obtain (Ba0.7Pb0.3)TiO3 materials possessing double critical temperature Tc in resistivity–temperature (ρ–T) behavior by microwave sintering at 1050–1080 °C for 5 min. The cooling-rate control and postannealing processes modify the relative magnitudes of low- and high-Tc resistivity jumps without altering the Tc values. The donor Ed and trap Es levels of those materials are estimated to be Ed(approximately-equal-to)0.05–0.07 eV and Es(approximately-equal-to)1.07–1.32 eV. According to experimental results the voltage sensitivity and transient responsivity of the current passing through double-Tc materials are observed to be superior to those of single-Tc materials prepared by the conventional furnace sintering method. Also, the double-Tc characteristics are attributed to the dual phases with a core-shell structure. Moreover, the change in the relative proportion of the two phases accounts for the influence of post-heat treatment processes on the materials' ρ–T behavior. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.363437
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