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機(jī)械合金化法制備的Mn15Bi34Te51和La15Bi34Te51熱電材料
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TN37 TF123.111

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國家自然科學(xué)基金資助項(xiàng)目(59971044)，教育部博士點(diǎn)基金資助項(xiàng)目(97033518)


Mn_(15)Bi_(34)Te_(51) and La_(15)Bi_(34)Te_(51) Thermoelectric Materials by Mechanical Alloying
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    摘要:

    用機(jī)械合金化法制備了Mn15Bi34Te51和La15Bi34Te51合金，XRD分析表明Mn15Bi34Te51和La15Bi34Te51分別在真空球磨150h和100h后實(shí)現(xiàn)合金化，La15Bi34Te51在真空球磨150h后形成了納米結(jié)構(gòu)的合金，鑭原子的加入有助于Bi2Te3基合金的晶粒細(xì)化及非晶化。對(duì)La15Bi34Te51合金的XRD結(jié)構(gòu)分析表明鑭原子有可能進(jìn)入了Bi2Te3層狀結(jié)構(gòu)的Te-Te原子層間。La15Bi34Te51合金Seebeck系數(shù)的測量表明當(dāng)晶粒尺寸減小到納米尺寸時(shí)，載流子散射機(jī)制有可能發(fā)生改變，導(dǎo)致了Seebeck系數(shù)的大幅上升。

    Abstract:

    According to XRD the alloys Mn15Bi34Te51 and La15Bi34Te51 were formed after ball milling for 150 h and 100 h, respectively. Nanostructured La15Bi34Te51 resulted from extending the ball milling time to 150 h, It is suggested that the addition of La may refine the grain size and help to promote amorphism in Bi2Te3 based alloys. Further detailed XRD analysis of La15Bi34Te51 alloys suggests that the La atoms may intercalate between the Te Te layers of the Bi2Te3 layer structure. The Seeback coefficient measurements on the La15Bi34Te51 alloys indicates that the carrier scattering mechanism changes when the grain sizes are decreased to a few nanometers leading to a dramatic increase in the Seeback coefficient.

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胡淑紅 趙新兵 等.機(jī)械合金化法制備的Mn15Bi34Te51和La15Bi34Te51熱電材料[J].稀有金屬材料與工程,2002,(4):287~290.[Hu Shuhong, Zhao Xinbing, Zhu Tiejun. Mn_(15)Bi_(34)Te_(51) and La_(15)Bi_(34)Te_(51) Thermoelectric Materials by Mechanical Alloying[J]. Rare Metal Materials and Engineering,2002,(4):287~290.]
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  • 最后修改日期:2000-11-13
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