论文部分内容阅读
介绍用Fe、Nb对SrTiO_3中八面体B晶位上的Ti离子进行百分之百的取代,调节Fe、Nb的摩尔百分比,使其符合类钙钛矿的A_nB_nO_(3n-1)及A_mB_mO_(3m+2)系列n、m取整数的组分。从制得9种组分的试样X衍射分析看到常温下,仍保持钙钛矿的基本结构。受主一边由蝎针镍结构向钙钛矿结构过渡中,在-50℃～200℃,呈现6个数量级的PTCR区段。在施主一边,20℃～200℃范围出现中、高阻PTCR区段,20℃以下呈现良好介电特性。在14℃～140℃,电阻率随电压变化不大。
Introduction of Fe and Nb to SrTiO_3 octahedral B-site Ti ion 100% substitution, adjust the molar percentage of Fe, Nb, so that it is consistent with the class of perovskite A_nB_nO_ (3n-1) and A_mB_mO_ (3m +2 ) Series n, m takes an integral number of components. From the X-ray diffraction analysis of the sample prepared from the nine components, it can be seen that the basic structure of the perovskite remains at room temperature. On the one hand, the transition from the scorpion nickel structure to the perovskite structure took place at a temperature of -50 ° C to 200 ° C, exhibiting six orders of magnitude of PTCR. On the donor side, medium- and high-resistance PTCR sections appear in the range of 20 ° C to 200 ° C and exhibit good dielectric properties below 20 ° C. At 14 ℃ ~ 140 ℃, the resistivity changes little with voltage.