Development of lanthanoid sulfides for ceramics condenser with large-capacity
大容量陶瓷电容器用镧系元素硫化物的研制
基本信息
- 批准号:16360369
- 负责人:
- 金额:$ 9.15万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2004
- 资助国家:日本
- 起止时间:2004 至 2006
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Rare-earth sesquisulfides R_2S_3 (R : La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Yb, and Lu) were synthesized by the reaction of rare-earth oxides with CS_2 gas. With the exception of Lu, synthetic powders devoid of intermediate products such as an oxysulfide were obtained. A monosulfide was obtained in the case of Eu. The thermoelectric properties were improved by the optimization of the ratios of rare-earth metal to sulfur. For a γ-GdS_x compact, the thermoelectric figure of merit ZT increased with a decrease in the sulfur content and reached a value of 0.16 at x = 1.43. Moreover, the thermoelectric properties were measured for the γ-LaS_<1.5> compact whose crystal phase was controlled by the addition of Ti to a synthetic powder. The transformation from the tetragonal β-phase to the y-phase is affected by the oxygen impurities. The β-phase is in fact an oxysulfide La_<10>S_<14>(O_<1-x>S_x) with 0【less than or equal】x【less than or equal】1. While the presence of oxygen stabilizes the tetragonal form over a wide temperature range, the β-phase with a low oxygen content undergoes further transformation to the y-phase at around 1600 K. We observe that the Ti additive promotes the transformation from La_<10>S_<14>O to the γ-phase. In the γ-phase with 8 wt. % Ti, ZT increases with the temperature and reaches a value of 0.21 at 1000 K. The Ti additive is suitable for improving the high-temperature thermoelectric properties because it promotes the formation of the y-phase with high thermoelectric performance. Moreover, the β-phase with Ti is a candidate material for high-temperature thermoelectric conversion. The magnitude of the Seebeck coefficient increases with the temperature, while the electrical resistivity decreases. Consequently, ZT increases abruptly from 0.013 at 300 K to 0.18 at 1000 K.
用稀土氧化物与CS_2气体反应合成了稀土倍半硫化物R_2S_3(R:La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Yb,Lu)。除了Lu之外,获得了不含中间产物如氧硫化物的合成粉末。在Eu的情况下获得单硫化物。通过优化稀土金属与硫的配比,提高了材料的热电性能。对于γ-GdS_x压块,热电优值ZT随硫含量的降低而增大,当x = 1.43时,ZT达到0.16。此外,还测试了<1.5>在合成粉末中添加Ti控制晶相的γ-LaS_2压块的热电性能。氧杂质影响从四方β相到y相的转变。β相实际上是氧硫化物La_<10>S_<14>(O_<1-x>S_x),其0 ≤ x ≤ 1。虽然氧的存在在宽的温度范围内稳定了四方晶型,但具有低氧含量的β相在约1600 K下经历进一步转变为y相。我们观察到Ti的加入促进了La_<10>S_<14>O向γ相的转变。在γ相中加入8 wt. % Ti,ZT随温度升高而增大,在1000 K时达到0.21。Ti添加剂由于促进了具有高热电性能的y相的形成而适合于改善高温热电性能。此外,含Ti的β相是高温热电转换的候选材料。塞贝克系数的大小随温度的升高而增大,而电阻率则随温度的升高而减小。因此,ZT从300 K时的0.013突然增加到1000 K时的0.18。
项目成果
期刊论文数量(32)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Thermoelectric properties of Th_3P_4-type rare-earth sulfides Ln_2S_3 (Ln=Gd, Tb) prepared by reaction of their oxides with CS_2 gas
其氧化物与CS_2气体反应制备Th_3P_4型稀土硫化物Ln_2S_3(Ln=Gd,Tb)的热电性能
- DOI:
- 发表时间:2007
- 期刊:
- 影响因子:0
- 作者:M.Ohta;H.Yuan;S.Hirai;Y.Yajima;T.Nishimura;K.Shimakage
- 通讯作者:K.Shimakage
Preparation of R2S3 (R: La, Pr, Nd, Sm) powders by sulfurization of oxide powders using CS2 gas
- DOI:10.1016/j.jallcom.2003.11.081
- 发表时间:2004-07
- 期刊:
- 影响因子:6.2
- 作者:M. Ohta;Hai-bin Yuan;S. Hirai;Y. Uemura;K. Shimakage
- 通讯作者:M. Ohta;Hai-bin Yuan;S. Hirai;Y. Uemura;K. Shimakage
Phase transformation from tetragonal-phase to cubic-phase due to addition of titanium in lanthanum sesquisulfide
- DOI:10.1016/j.jallcom.2003.11.082
- 发表时间:2004-07
- 期刊:
- 影响因子:6.2
- 作者:M. Ohta;S. Hirai;S. Morita;T. Nishimura;Y. Uemura
- 通讯作者:M. Ohta;S. Hirai;S. Morita;T. Nishimura;Y. Uemura
Formation of Al-Si Composite Oxide Films on Aluminum by Electrophoretic Sol-Gel Coating/Anodizing
电泳溶胶凝胶涂层/阳极氧化在铝上形成铝硅复合氧化膜
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:H.Takahashi;M.Sunada;T.Kikuchi;M.Sakairi;S.Hirai
- 通讯作者:S.Hirai
Thermoelectric Properties of Th_3P_4 type Rare-Earth Sulfide : NdGdS_3
Th_3P_4型稀土硫化物NdGdS_3的热电性能
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:M.Ohta;Y.Horiguchi;S.Hirai
- 通讯作者:S.Hirai
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HIRAI Shinji其他文献
HIRAI Shinji的其他文献
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{{ truncateString('HIRAI Shinji', 18)}}的其他基金
Recovery of waste animal fibers by using ore dressing technology in extracting metals and their effective utilization
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25630334 - 财政年份:2013
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Preparation of High Temperature Thermoelectric Materials such as Chevrel-type and Stannite-type Sulfides
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24360314 - 财政年份:2012
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Application of Nanostructure Prepared by Sol-Gel Process to CO_2 Absorbent, Membrane and Photomultiplier
溶胶-凝胶法制备的纳米结构在CO_2吸收剂、膜和光电倍增管中的应用
- 批准号:
14350376 - 财政年份:2002
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$ 9.15万 - 项目类别:
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The Separation of Noxious Proteins from Blood Preparation Using the Anodically Grown Aluminum Oxide Membranes
使用阳极生长的氧化铝膜从血液制备中分离有毒蛋白质
- 批准号:
12555191 - 财政年份:2000
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$ 9.15万 - 项目类别:
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Protein-Hydroxyapatite Hybrid Coating on Titatium Substrate by the Sol-Gel Process
通过溶胶-凝胶法在钛基底上形成蛋白质-羟基磷灰石杂化涂层
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12650706 - 财政年份:2000
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$ 9.15万 - 项目类别:
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THE RESEARCH OF SEGREGATION PROCESS OF HEAVY METAL ION OR BACTERIA FROM WASTE WATER USING ALUMINUM ANODIC OXIDE MEMBRANE
铝阳极氧化膜分离废水中重金属离子或细菌的工艺研究
- 批准号:
10555237 - 财政年份:1998
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ULTRA-ALKALINE CORROSION RESISTANCE COATINGS VIA ELECTROPHORETIC SOL-GEL PROCESSING
通过电泳溶胶-凝胶工艺制备超碱性耐腐蚀涂层
- 批准号:
09650774 - 财政年份:1997
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$ 9.15万 - 项目类别:
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