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  5. Influence of sintering schedule on the electrical properties of Mn(NO3)2-doped Ba0.92Ca0.08TiO3 PTCR

Influence of sintering schedule on the electrical properties of Mn(NO3)2-doped Ba0.92Ca0.08TiO3 PTCR

来源 :稀有金属 | 被引量 : 0次 | 上传用户：zhaisuorenjlu
【摘 要】
：
The relationship of electrical properties of Mn-doped Ba0.92Ca0.08TiO3 PTCR (positive temperature coefficient resistance) ceramics with two sintering schedules
【作 者】
：
CAO Minghe YUAN Jun CAO Mingli 
【机 构】
：
Department of Materials of Science and Engineering,State Key Laboratory of Advanced Technology for M
【出 处】
：
稀有金属
【发表日期】
：
2004年期
【关键词】
：
positive temperature coefficient resistance grain boundaries sintering schedule 
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The relationship of electrical properties of Mn-doped Ba0.92Ca0.08TiO3 PTCR (positive temperature coefficient resistance) ceramics with two sintering schedules was discussed. Using TEM (transmission electron microscope) combined with EDS (energy dispersive X-ray spectrometer), the Mn ions distributed at grain boundaries were analyzed. The results show that the PTCR effect of Mn-doped PTCR ceramics is more dependent on the sintering schedule than those of Mn free.The phenomenon may be caused by the valence states variance of Mn ions segregated at the grain boundaries.
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