Synthesis's of Rare Earth Sulfides and Its Thermo-Electnc Properties

稀土硫化物的合成及其热电性能

• 批准号: 13450304
• 负责人: SHIMAKAGE Kazuyoshi
• 金额: $ 8.77万
• 依托单位: Muroran Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450304/
• 关键词: Rare earth sulfide; Thermo-electric properties; Synthisis; Sulfurization reaction; Zeebeck coefficient; Hot-Press; lanthanam sulfide; Power factor; 熱電変換材料; La_2S_3焼結体; 熱電材料; La2S3焼結体; 合成; La_2S_3粉末; 電極材料

The formation behaviors of R2S3(R:La,Pr,Nd and Sm) powders in sulfurization of La203,Pr6011,Nd203 and Sm203 powders, respectively, using CS2 gas were examined.In all cases, R202S which were intermediate products, were formed in the initial stage of reaction, and R2S3 were formed for a shorter period of time at higher temperature instead of R202S. In the Synthesis of La2S3 and Sm2S3, single-phase、β-La2S3 and α-Sm2S3, respectively, were finally prepared.On the other hand, in the synthesis of Pr2S3 and Nd2S3, α-Pr2S3 and α-Pr2S3 having trace of residual β-Pr2S3 and single β-Pr2S3, respectively, were finally prepared.In all cases, the impurity contents of oxygen and carbon in reaction products were dependent on the sulfurization conditions.In finally experiment, the thermo-electric properties for all rare earth sulfides synthesized were measured. As a result, Zeebeck coefficient and the thermo-electric property for lanthanam sulfide were extremely better than other sulfides.

研究了在CS2气氛下，La_（203）、Pr_（6011）、Nd_（203）和Sm_（203）粉末的硫化反应中R_2S_3（R：La、Pr、Nd和Sm）粉末的生成行为，发现在所有情况下，R_2O_2S都是在反应初期生成的中间产物，而在较高温度下，R_2S_3的生成时间较短。在La_2S_3和Sm_2S_3的合成中，最终分别制备了单相β-La_2S_3和α-Sm_2S_3。另一方面，在Pr_2S_3和Nd_2S_3的合成中，最终分别制备了α-Pr_2S_3和α-Pr_2S_3，其中含有微量的残余β-Pr_2S_3和单一的β-Pr_2S_3。在所有情况下，反应产物中氧、碳杂质含量与硫化条件有关，最后对所合成的稀土硫化物进行了热电性能测试。结果表明，硫化镧系元素的Zeebeck系数和热电性能均优于其他硫化物。

项目成果

平井伸治, 嶋影和宜: "ランタナイド系二元硫化物の合成と焼成"金属. 第70巻8号. 629-636 (2000)

Shinji Hirai，Kazuyoshi Shimakage：“基于镧系元素的二元硫化物的合成和烧制”，第 70 卷，第 8 期。629-636 (2000)。

平井伸治, 嶋影和宜, その他: "CS_2ガス硫化反応によるγ-Pr_2S_3およびγ-Nd_2S_3の合成と焼結"日本金属学会誌. 第67巻、6号. 15-21 (2003)

Shinji Hirai、Kazuyoshi Shimakage等：“通过CS_2气体硫化反应合成和烧结γ-Pr_2S_3和γ-Nd_2S_3”日本金属学会学报第67卷15-21（2003年）。

M.Ohta, S.Hirai, K.Shimakage, et al.: "Preparation of R2S3 (Ln : La, Pr, Nd, Sm) Powders by Sulfurization of Oxide Powders Using CS2 Gas"Proceedings of Fifth International Conference on f- Elements, Geneva, Switzerland. 24-29 (2003)

M.Ohta、S.Hirai、K.Shimakage 等人：“利用 CS2 气体硫化氧化物粉末制备 R2S3（Ln：La、Pr、Nd、Sm）粉末”第五届国际 f 元素会议论文集

平井伸二, 嶋影和宜, 上村揚一郎: "耐火材料や熱電材料として期待されるランタナイド系二元系硫化物"金属. 70巻、11号. 960-965 (2000)

Shinji Hirai、Kazuyoshi Shimakage、Yoichiro Uemura：“有望用作耐火材料和热电材料的稀土基二元硫化物”，第 70 卷，第 11 期。960-965 (2000)。

M.Ohta, S.Hirai, K.Shimakage et al.: "Preparation of R2S3 (Re:La,Pr,Nd,Sm) Powders by Sulfurization of Oxides Powders Using CS2 Gas"Proceedings of Fifth International Conference on f-elements, Geneva, Switzerland. (2003)

M.Ohta、S.Hirai、K.Shimakage 等人：“使用 CS2 气体硫化氧化物粉末制备 R2S3 (Re:La,Pr,Nd,Sm) 粉末”第五届 f 元素国际会议论文集，