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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Characteristics of porous BaTiO_3-based PTC thermistors fabricated by adding graphite powders
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Characteristics of porous BaTiO_3-based PTC thermistors fabricated by adding graphite powders

机译：添加石墨粉制备的多孔BaTiO_3基PTC热敏电阻的特性

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摘要

The crystalline structure, microstructure, and electrical properties of porous graphite-containing BaTiO_3-based PTC thermistors were studied. The sintered ceramics showed a tetragonal perovskite structure, irrespective of the added graphite content. The added graphite formed the interstitial solid solutions with Ba_(0.999)Sb_(0.001)TiO_3 and was distributed homogeneously in the sintered ceramics. The grain size of the as-sintered graphite-containing BaTiO_3-based ceramics was much larger than that of the as-sintered graphite-free ones. This is mainly due to the exothermic reactions of the graphites and oxygen molecules in the ceramics. The porosity of the as-sintered ceramics increased with increasing graphite content due to an enhanced evolution of CO and CO_2 gases associated with the exothermic reactions. It was found that the newly prepared porous graphite-containing BaTiO_3-based PTC thermistors showed a large PTCR effect.
机译：研究了多孔石墨含BaTiO_3基PTC热敏电阻的晶体结构，微观结构和电学性能。不论添加的石墨含量如何，烧结陶瓷均显示出四方钙钛矿结构。添加的石墨与Ba_（0.999）Sb_（0.001）TiO_3形成间隙固溶体，并均匀分布在烧结陶瓷中。烧结后的含石墨的BaTiO 3基陶瓷的晶粒尺寸比烧结后的无石墨的陶瓷的晶粒尺寸大得多。这主要是由于陶瓷中的石墨和氧分子发生放热反应。烧结后的陶瓷的孔隙率随石墨含量的增加而增加，这是由于与放热反应相关的CO和CO_2气体逸出量增加所致。发现新制备的含多孔石墨的BaTiO_3基PTC热敏电阻显示出较大的PTCR效应。

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