IONIC CONDUCTION IN NEW COMPOUNDS OF THE TERNARY SYSTEMS

本文首先研究了CaSO_4-CaCl_2和SrSO_4-SrCl_2，CaCO_3-CaCl_2和SrCO_3-SrCl_2体系中的样品。在各体系中，当添加剂含量在10- 30mol%之间时，均形成固溶体，即SO_4 ~（2-）<2->或CO_3 ~（2-）<2->可被氯离子取代。而且，尽管基础材料在所有情况下都显示出非常低的电导率，但替代样品中的电导率随着添加剂组分的增加而增加。这些样品中的电荷载体被发现只有离子，而不是电子。为了使CO_2传感器能在高浓度CO_2气体环境中稳定工作，我们对碳酸盐材料进行了研究。其次，为了研究白钨矿型和尖晶石型化合物固溶体中的氧离子导电性，我们合成了Pb_<1-x>Ln_xWO_&lt;4+X/2&gt;、Pb_<1-X>Ln_&lt;2x/3&gt;WO_4和Zn_&lt;2-x/2&gt;Ti_<1-x>Ta_xO_4固溶体，并测量了它们的电导率。结果，在前两种系统中，观察到高的氧化物离子传导，其值在800 ℃下超过10 μ <-2>Scm μ<-1>。在后一种情况下，没有观察到这样的高传导，但是发现氧化物离子传导在氧化物离子的最紧密堆积结构中是可能的。即使在白钨矿型结构的情况下，发现阳离子（锂离子）导电，如果我们设计的替代为Ca_<1-x>Li_<2x>WO_4。在这种情况下，根据NRG的观察结果，锂离子传导被认为是由间隙锂离子引起的。

At first, we have investigated on the samples in the systems CaSO_4-CaCl_2 and SrSO_4-SrCl_2, and CaCO_3-CaCl_2 and SrCO_3-SrCl_2. In each system, if the additives content was between 10-30 mol%, the solid solutions were found to be formed, which means that SO_4^<2-> or CO_3^<2-> can be substituted by the chloride ions. And, although the based materials showed very low conductivity in all cases, the conductivity in the substituted samples grew higher with increasing additive components. The charge carrieres in these samples were found to be only ions, not electrons. Here, we paid attention to the materials composed of carbonate in order to make a CO_2 sensor stable in the environment containing fairly high concentration of CO_2 gas. Judging from the EMF response of the cell, these materials were found to be a candidate for it.Next, in order to study the oxide ion conduction in the solid solutions based on Scheelite- and Spinel-type compounds, which have not been investigated at all as to their ionic conduction, we synthesized the solid solutions of Pb_<1-x>Ln_xWO_<4+X/2>, Pb_<1-X>Ln_<2x/3>WO_4 and Zn_<2-x/2>Ti_<1-x>Ta_xO_4, and measured their conductivities. As a result, in the former two systems, the high oxide ion conduction was observed, the value of which exceeded 10^<-2> Scm^<-1> at 800ﾟC.In the latter case, such a high conductivity was not observed but the oxide ion conduction was found to be possible in the closest packing structure of oxide ions. Even in the case of the Scheelite-type structure, the cation (lithium ion) conduction was found to be observed, if we designed the substitution as Ca_<1-x>Li_<2x>WO_4. In this case, the lithium ion conduction was considered to be ascribed by the interstitial lithium ions by the result of the observation of NRG.