中国有色金属学报（英文版）
中國有色金屬學報（英文版）
중국유색금속학보（영문판）
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2011年
8期
1785-1789
,共5页
Mg2Si%热电材料%固相反应%微波合成
Mg2Si%熱電材料%固相反應%微波閤成
Mg2Si%열전재료%고상반응%미파합성
Mg2Si%thermoelectric materials%solid state reaction%microwave synthesis
为了解决Mg2Si传统制备方法中Mg的氧化、挥发等问题,采用微波低温固相反应法合成Mg2Si热电材料.用XRD分析手段研究合成产物的结构及相组成.在300到700 K的温度范围内,对材料的电导率、Seebeck 系数和热导率随温度的变化进行测量.结果表明,当Mg过量8％、加热功率为2.5 kW时,于853 K保温30 min,可以得到单相Mg2Si热电化合物.在测试温度范围内,Mg2Si具有较高的品质因数ZT值,在600 K温度下达到0.13.
為瞭解決Mg2Si傳統製備方法中Mg的氧化、揮髮等問題,採用微波低溫固相反應法閤成Mg2Si熱電材料.用XRD分析手段研究閤成產物的結構及相組成.在300到700 K的溫度範圍內,對材料的電導率、Seebeck 繫數和熱導率隨溫度的變化進行測量.結果錶明,噹Mg過量8％、加熱功率為2.5 kW時,于853 K保溫30 min,可以得到單相Mg2Si熱電化閤物.在測試溫度範圍內,Mg2Si具有較高的品質因數ZT值,在600 K溫度下達到0.13.
위료해결Mg2Si전통제비방법중Mg적양화、휘발등문제,채용미파저온고상반응법합성Mg2Si열전재료.용XRD분석수단연구합성산물적결구급상조성.재300도700 K적온도범위내,대재료적전도솔、Seebeck 계수화열도솔수온도적변화진행측량.결과표명,당Mg과량8％、가열공솔위2.5 kW시,우853 K보온30 min,가이득도단상Mg2Si열전화합물.재측시온도범위내,Mg2Si구유교고적품질인수ZT치,재600 K온도하체도0.13.
In order to reduce the oxidation and volatilization caused by Mg element in the traditional methods for synthesizing Mg2Si compounds,Mg2Si thermoelectric materials were prepared by solid state reaction and microwave radiation techniques.Structure and phase composition of the materials were investigated by X-ray diffraction.The electrical conductivity,Seebeck coefficient and thermal conductivity were measured as a function of temperature from 300 to 700 K.It is found that high purity Mg2Si powders can be obtained with excessive content of 8％ Mg from the stoichiometric Mg2Si at 853 K and 2.5 kW for 30 min.A maximum dimensionless figure of merit,ZT,of about 0.13 was obtained for Mg2Si at 600 K.
