IONIC CONDUCTION IN NEW COMPOUNDS OF THE TERNARY SYSTEMS

三元体系新化合物中的离子传导

基本信息

批准号：
07650995
负责人：
ESAKA Takao
金额：
$ 1.22万
依托单位：
TOTTORI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650995/
关键词：
Ionic conductor Solid electrolyte Oxysalt Oxide ion Scheelite イオン伝導性硫酸カルシウム

项目摘要

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.

首先，我们对CaSO_4-CaCl_2和SrSO_4-SrCl_2体系以及CaCO_3-CaCl_2和SrCO_3-SrCl_2体系中的样品进行了研究。在每个体系中，当添加剂含量在10-30 mol%之间时，都发现了固溶体。形成，这意味着SO_4^<2->或CO_3^<2->可以被氯化物取代而且，尽管基础材料在所有情况下都表现出非常低的电导率，但随着添加剂成分的增加，替代样品中的电导率变得更高，我们注意到这些样品中的电荷载流子只是离子，而不是电子。为了使CO_2传感器在含有相当高浓度CO_2气体的环境中保持稳定，我们选择了由碳酸盐组成的材料。从电池的EMF响应来看，这些材料被发现是其候选材料。学习基于白钨矿和尖晶石型化合物的固溶体中的氧化物离子传导，这些化合物根本没有研究过它们的离子传导性，我们合成了 Pb_<1-x>Ln_xWO_<4+X/2 的固溶体>、Pb_<1-X>Ln_<2x/3>WO_4 和 Zn_<2-x/2>Ti_<1-x>Ta_xO_4 并测量了它们的结果，在前两个体系中，观察到高氧化物离子传导，其值在800°C时超过10^<-2>Scm^<-1>。在后一种情况下，如此高的电导率。没有观察到导电性，但发现在氧化物离子的最密堆积结构中可以进行氧化物离子传导，即使在白钨矿型结构的情况下，也可以进行阳离子(锂离子)传导。发现观察到，如果我们将取代设计为Ca_<1-x>Li_<2x>WO_4，在这种情况下，根据NRG的观察结果认为锂离子传导是由间隙锂离子引起的。