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，我们已经对系统中的样品进行了调查，而caso_4-cacl_2和srso_4-srcl_2和caco_3-cacl_2和srco_3-srcl_2。在每个系统中，如果添加的含量在10-30 mol％之间，则发现固体溶液形成，这意味着SO_4^<2->或co_3^<2->可以用氯离子代替。而且，尽管在所有情况下，基于材料的电导率都非常低，但随着其他组件的增加，取代样品中的电导率越高。发现这些样品中的荷载体仅是离子，而不是电子。在这里，我们注意由碳酸盐组成的材料，以使CO_2传感器在含有相当高的CO_2气体的环境中稳定。从细胞的EMF响应来看，这些材料被发现是它的候选。 pb_ <1-x> ln_ <2x/3> wo_4和zn_ <2-x/2> ti_ <1-x> ta_xo_4，并测量了它们的电导率。结果，在前两个系统中，观察到高氧化离子传导，其值超过了10^<-2> scm^<-1>在800 ﾟ时C.在后一种情况下，未观察到这样的高电导率，但在最接近的氧化物离子封装结构中可能发现了氧化离子传导。即使在Scheelite型结构的情况下，如果我们将替代形式设计为Ca_ <1-x> li_ <2x> wo_4，则发现阳离子（锂离子）传导也可以观察到。在这种情况下，通过观察NRG的结果，认为锂离子传导由间质锂离子分配。