Synthesis of metal silicides using alkali metals and their thermoelectrical properties

碱金属金属硅化物的合成及其热电性能

• 批准号: 20685015
• 负责人: YAMADA Takahiro
• 金额: $ 15.89万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (A)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20685015/
• 关键词: 無機合成; 材料合成プロセス; 熱電変換材料; 金属シリサイド; 金属ケイ化物; ナトリウム; 低温合成; 高温構造材料; 準安定相; 耐酸化被膜; 鉄シリサイド; 低温焼結; 熱電材料

Powder and bulk of thermoelectric metal silicides such as β-FeSi_2,MnSi_<1.7+δ>, CoSi, CrSi_2,and Mg_2Si were prepared by heating mixtures of Si and metal powders or Si powders and compact body of metal powders with Na at low temperatures (500-900℃). Thermoelectric properties of the prepared metal silicides were characterized. The existence of Na-Si melt above ca. 500℃ was revealed by the study of Na-Si phase diagram. It indicates that the metal silicides are prepared by a reaction of Si (liquid) in the melt with the metals (solid). Powder of high-melting point metal silicides such as α-MoSi_2and NbSi_2,and metastable phase β-MoSi_2were prepared at 800,627,and 600-C, respectively. NbSi_2layer, which has oxidation resistance, was fabricated on the surface of Nb plate by heating the Nb plate with Si powder and Na. It was demonstrated that the new preparation method using Na can be adopted for the low-temperature preparation of metal silicides.

粉末和大量的热电金属这样的β-FESI_2，MnSi_ <1.7+δ>和金属粉末或Si粉末和Na-si在低温下（500-900°C）的金属粉末的紧凑型物体。 500 ca在800,627和600-C的尊敬者中，使用氧化剂的NBSI_2LAYER在NB板的表面上使用Si粉末和NA进行了套件。

项目成果

Pressure-less preparation of polycrystalline β-FeSi_2 bulk with a Na melt

Na熔体无压制备多晶β-FeSi_2块体

• 发表时间: 2009
• 作者: 山田高広;et al.
• 通讯作者: et al.

ナトリウムを用いた珪化マグネシウムの合成

用钠合成硅化镁

• 发表时间: 2009
• 作者: 大石悠佑;他
• 通讯作者: 他

Na-Si二元系状態図を用いたSi結晶の融液成長

使用 Na-Si 二元相图熔融生长 Si 晶体

• 发表时间: 2009
• 作者: 森戸春彦;山田高広;池田卓史;山根久典
• 通讯作者: 山根久典

Na-Si融液を用いたNb板へのNbSi_2コーティング被膜の作製

Na-Si熔体在铌板上制备NbSi_2镀膜

• 发表时间: 2010
• 作者: 佐藤裕人;山田高広;森戸春彦;山根久典
• 通讯作者: 山根久典

Preparation of β-FeSi_2 and MnSil_<1.7+δ> Bulks from Metal Compact Bodies Using a Na-Si Melt and Their Thermoelectric Properties

Na-Si熔体金属致密体制备β-FeSi_2和MnSil_<1.7+δ>块体及其热电性能

• 发表时间: 2010
• 作者: T.Yamada.E.Kariya;H.Morito;Y.Miyazaki;J.Takahashi;H.Yamane
• 通讯作者: H.Yamane