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

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Lu外,合成粉末不含中间产物,如硫氧化物。在Eu的情况下,得到了一种单硫化物。通过优化稀土金属与硫的比例,改善了材料的热电性能。对于γ-GDS_x系压敏材料,热电优值系数ZT随硫含量的降低而增大,在x=1.43时达到0.16.此外,还测量了γ-LAS_&lt;1.5&gt;压坯的热电性能,其晶相是通过在合成粉末中添加钛来控制的。氧杂质对四方β相向y相的转变有影响。β相实际上是一个氧硫化物La_&lt;10&gt;S_&lt;14&gt;(O_&lt;1-x&gt;S_x),0[小于等于]x[小于等于]1.氧的存在在较宽的温度范围内稳定了四方相,而低氧含量的β相在1600K左右进一步向y相转变。我们观察到钛的加入促进了La&lt;10&gt;S&lt;14&gt;O向γ相的转变。在含8wt.%Ti的γ相中,ZT随温度升高而增大,在1000K时达到0.21.钛的添加促进了具有较高热电性能的y相的形成,适合于改善高温热电性能.此外,含钛的β相也是高温热电转换的候选材料。塞贝克系数随温度升高而增大,而电阻率随温度升高而减小。因此,ZT从300K时的0.013突然增加到1000K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
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
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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
提取金属选矿技术回收废弃动物纤维及其有效利用
  • 批准号:
    25630334
  • 财政年份:
    2013
  • 资助金额:
    $ 9.15万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Preparation of High Temperature Thermoelectric Materials such as Chevrel-type and Stannite-type Sulfides
Chevrel型和Stanite型硫化物等高温热电材料的制备
  • 批准号:
    24360314
  • 财政年份:
    2012
  • 资助金额:
    $ 9.15万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
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
  • 资助金额:
    $ 9.15万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
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
  • 资助金额:
    $ 9.15万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
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
  • 批准号:
    12650706
  • 财政年份:
    2000
  • 资助金额:
    $ 9.15万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
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
  • 资助金额:
    $ 9.15万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
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
  • 资助金额:
    $ 9.15万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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