摘要
详细研究了多种离子取代对Ｌａ_２ＣｕＯ_４电学性质的影响．Ｚｎ^（２＋）和Ｍｇ^（２＋）分别取代Ｃｕ^（２＋）都使Ｌａ_２ＣｕＯ_４的电阻率显著增加，并且Ｍｇ^（２＋）的作用比Ｚｎ^（２＋）大。Ｎｉ^（２＋）取代Ｃｕ^（２＋）后，总的趋势是样品的电阻率降低，但Ｌａ_２Ｃｕ_（０．８）Ｎｉ_（０．２）Ｏ_４的电阻率最高，这可能与相转变有关。结合Ｌａ_２ＣｕＯ_４的结构特征，文中对各种离子的取代作用进行了讨论．
In this work, we mainly study the influence of ionic substitutions on the electrical property of La_2CuO_4. The substitution of Cu￣(2+) by Zn￣(2+) and Mg￣(2+) will raise the electricalresistivity of La_2CuO_4 and Zn￣(2+)has a lower effect on the electrical resistivity than Mg￣(2+). Totally speaking, the substitution of Cu￣(2+)by Ni￣(2+)will reduce the electrical resistivity.But sample La,Cu_2O_(0.8) Ni_(0.2)O_4 has the highest resistivity and the highest activation energy,this may be due to the phenomenon of phase change. The effect of each ion on the electrical property of La_2CuO_4 is discussed in detail in this paper.
出处
《湖南师范大学自然科学学报》
CAS
1995年第4期35-39,共5页
Journal of Natural Science of Hunan Normal University
