La2Ti6O15-CeTi21O38-PbTiO3 ceramics formed in gaseous penetration of La-Ce into PbTiO3 and their electric properties |
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Authors: | Sue Hao Yongde Wei and Xinrong Liu |
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Institution: | (1) Department of Applied Chemistry, Harbin Institute of Technology, 150001 Harbin, China |
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Abstract: | The gaseous penetration of La-Ce into PbTiO3 ceramics is reported. The compounds of La2Ti6O15 and CeTi21O38 are formed and the new La2Ti6O15-CeTi21O38-PbTiO3 ceramics are prepared by the penetration of La and Ce in the gaseous state. The new ceramic materials have a significant
change in electric properties. The room temperature resistivity decreases from 2.0×1010 to 0.248 Ω. m, and the grain resistance exhibits an obvious PTCR effect with the change of temperature. However, the grain
boundary resistance decreases rapidly with increase in temperature. The change rule of the total resistance is similar to
that of the grain boundary, and the PTCR effect disappears and the tendency of transition to a conductive body is manifest.
The XPS analysis suggests that the particles that are Pb, Ti, La and Ce in La2Ti6O15-CeTi21O38-PbTiO3 ceramics all change their valence and lead to decreasing resistivity, and the bound energy peak values of elements in La2Ti6O15-CeTi21O38-PbTiO3 ceramics are also reported. The La2Ti6O15-CeTi21O38-PbTiO3 ceramics have a better thermal stability in high temperatures through TG-DTA analysis. |
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Keywords: | rare earth PbTiO3 ceramics gaseous penetration electric properties La2Ti6O15 CeTi21O38 |
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