Development of next generation Peltier materials by means of misfit-layered sulfides

通过失配层状硫化物开发下一代珀耳帖材料

基本信息

批准号：
15560582
负责人：
MIYAZAKI Yuzuru
金额：
$ 2.24万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

We have focused on preparing misfit-layered sulfides [Ln_2S_2]_pTS_2 (Ln:lanthanide ions, T:transition metal ions), in which a large thermoelectric power factor and a low lattice thermal conductivity can be simultaneously realized, to design novel Peltier materials. First of all, a T=Nb system has been explored to prepare new p-type materials. Except for Ln=Eu and Lu, all the lanthanides ions including Y are found to form [Ln_2S_2]_pNbS_2 phases. Three-types of structure with different superspace group are discovered depending on their ionic radii. Larger ions with Ln=La,Ce and Pr form orthorhombic Fm2m(p00)00s, while the samples with Ln=Nd and Sm form Fm2m(p00)000. For smaller ions with Ln=Gd,Tb,Dy,Ho,Er,Tm,Yb and Y, monoclinic F2(p0q) phases are obtained. The sample with Ln=Yb exhibits the highest thermoelectric figure-of-merit Z=3.2 x 10^<-4> K^<-1>, with the Seebeck coefficient S=60μVK^<-1>, resistivity ρ=1.4 mΩcm and κ=0.80 WK^<-1>m^<-1>, at around 300 K, yielding the dimensionles … More s figure-of-merit ZT〜0.1. The Z value still increases with increasing temperature, but the maximum value of Z as well as the highest limit temperature to be utilized are not determined in detail. Next, we have fabricated a thermoelectric pn junction (1 pair) using a Yb-Nb-S compound as a p-type leg and a Sn-Ti-S compound as an n-type leg. The pn uncouple was attached to an Al sheet on its top with silver paste and then was subjected to the Peltier property measurements. At the beginning, a small temperature difference with several kelvin was in fact observed but the difference became small and reached zero with further applying an electric current. This behavior can be ascribed to the fact that the Seebeck coefficient of the both legs was not enough (〜70μVK^<-1>) to keep generating temperature difference because the generated Joule heat easily overcame the temperature difference. Hence, further study is necessary to design sulfide thermoelectric materials which have larger figure-of-merit. Less

我们专注于准备层状硫化物[LN_2S_2] _PTS_2（LN：Lanthanide离子，T：过渡金属离子），其中可以简单地实现大型热电学因子和低晶格的热导率，以设计新颖的Peltier材料。首先，已经探索了T = NB系统以准备新的P型材料。除了ln = eu和lu，发现包括y在内的所有灯笼离子形成[ln_2s_2] _pnbs_2阶段。根据其离子半径，发现具有不同超空间组的三种结构。具有LN = LA，CE和PR形式的较大离子Orthorhombic fm2m（P00）00s，而LN = ND和SM形式的样品fm2m（P00）000。对于具有Ln = GD，TB，DY，HO，ER，TM，YB和Y的较小离子，获得了单斜F2（P0Q）阶段。 The sample with Ln=Yb exhibits the highest thermoelectric figure-of-merit Z=3.2 x 10^<-4> K^<-1>, with the Seebeck core S=60μVK^<-1>, resistance ρ=1.4 mΩcm and κ=0.80 WK^<-1>m^<-1>, at around 300 K, yielding the dimensionles … More s figure-of-merit ZT~0.1. Z值仍会随温度的升高而增加，但是Z的最大值以及要使用的最高极限温度尚未详细确定。接下来，我们使用YB-NB-S化合物作为P型腿和SN-TI-S化合物作为N型腿制造了热电PN结（1对）。将PN的Uncoupele连接到其顶部的Al板上，并用银糊附加，然后进行毛发性属性测量。一开始，实际上观察到了几个开尔文的温度差异很小，但是差异很小，并且在进一步施加电流的情况下达到零。这种行为可以归因于以下事实：双腿的塞贝克芯还不够（〜70μVK^<-1>）来保持温度差，因为生成的焦点热很容易克服温度差。因此，对于设计具有较大标准的硫化物热电材料是必要的。较少的

项目成果

期刊论文数量（54）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

環境調和型新材料シリーズ「熱電変換材料」2.2章

环保新材料系列《热电转换材料》第2.2章

DOI：
发表时间：
2006
期刊：
影响因子：
0
作者：
S.Watanabe;et al.;Yuzuru Miyazaki;S.Watanabe 他5名;宮崎譲
通讯作者：
宮崎譲

Compounds and subsolidus phase relations in the CaO-Co_3O_4-CuO system

CaO-Co_3O_4-CuO体系中的化合物和亚固相线相关系

DOI：
发表时间：
2005
期刊：
J.Solid State Chem. 178
影响因子：
0
作者：
兵道哲;西原直枝;田中麻子;早川真由美;羽田正沖;田辺新一;岩本正和;Y.Miyazaki
通讯作者：
Y.Miyazaki

Crystal structure and thermoelectric properties of the misfit-layered cobalt oxides

DOI：
10.1016/j.ssi.2004.01.046
发表时间：
2004-08-31
期刊：
SOLID STATE IONICS
影响因子：
3.2
作者：
Miyazaki, Y
通讯作者：
Miyazaki, Y

Modulated structure of the misfit layer thermoelectric compound (Ca_2CoO_3)_pCoO_2

失配层热电化合物的调制结构(Ca_2CoO_3)_pCoO_2

DOI：
发表时间：
2004
期刊：
Journal of the Crystallographic Society of Japan 46
影响因子：
0
作者：
Yuzuru Miyazaki;Yuzuru Miyazaki;Yuzuru Miyazaki;Yuzuru Miyazaki;Yuzuru Miyazaki;Yuzuru Miyazaki;Yuzuru Miyazaki;Y.Miyazaki;Y.Miyazaki;Y.Miyazaki;Y.Miyazaki;Yuzuru Miyazaki;Yuzuru Miyazaki;宮崎譲;Yuzuru Miyazaki;Yuzuru Miyazaki;Yuzuru Miyazaki
通讯作者：
Yuzuru Miyazaki

Bismuth Substitution Effect on the Structure and Thermoelectric Properties of [Ca_2CoO_3]_pCoO_2

铋取代对[Ca_2CoO_3]_pCoO_2结构和热电性能的影响