Gaseous Penetration of Pr into PbTiO3 Ceramics and Their Electric Properties
来源期刊：JOURNAL OF RARE EARTHS2004年第4期
论文作者：韦永德 郝素娥 杨雪梅
Key words：functional materials; PbTiO3 ceramics; gaseous penetration; electric properties; rare earths;
Abstract: The gaseous Pr-penetration is a new method to modify ceramics, which is expected to be a promising method for producing new conductor ceramic materials. The gaseous penetration of Pr into PbTiO3 ceramics and their improved electric properties were reported. Through XRD, EPMA and SEM analysis,it is confirmed that the gaseous penetration makes Pr enter into PbTiO3 ceramics, and the new compound of Pr2Ti2O7 is formed by the penetration of Pr in the gaseous state. The formed new Pr2Ti2O7-PbTiO3 ceramic materials have a significant change in electric properties. The room temperature resistivity decreases from 2.0×1010 Ω·m to 9.487 Ω·m. The grain resistance and the grain boundary resistance decrease with increase in temperature, and the PTCR effect disappears. The tendency of transition to a conductive body is manifest.
韦永德1，郝素娥1，杨雪梅1
(1.Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,China)
Abstract:The gaseous Pr-penetration is a new method to modify ceramics, which is expected to be a promising method for producing new conductor ceramic materials. The gaseous penetration of Pr into PbTiO3 ceramics and their improved electric properties were reported. Through XRD, EPMA and SEM analysis,it is confirmed that the gaseous penetration makes Pr enter into PbTiO3 ceramics, and the new compound of Pr2Ti2O7 is formed by the penetration of Pr in the gaseous state. The formed new Pr2Ti2O7-PbTiO3 ceramic materials have a significant change in electric properties. The room temperature resistivity decreases from 2.0×1010 Ω·m to 9.487 Ω·m. The grain resistance and the grain boundary resistance decrease with increase in temperature, and the PTCR effect disappears. The tendency of transition to a conductive body is manifest.
Key words:functional materials; PbTiO3 ceramics; gaseous penetration; electric properties; rare earths;
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