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Ga、K雙摻雜P型Bi0.5Sb1.5Te3材料的制備及熱電性能
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國家自然科學(xué)基金（51161009）；江西省教育廳科技資助項(xiàng)目 (GJJ13722)


Preparation and Thermoelectric Properties of Ga and K Dual Doped P-Type Bi0.5Sb1.5Te3
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    摘要:

    采用真空熔煉和熱壓方法制備了Ga和K雙摻雜Bi0.5Sb1.5Te3熱電材料。XRD結(jié)果表明，Ga0.02Bi0.5Sb1.48-xKxTe3塊體材料的XRD圖譜與Bi0.5Sb1.5Te3的XRD圖譜對(duì)應(yīng)一致，但雙摻雜樣品的衍射峰略微向左偏移。熱壓塊體材料中存在明顯的(00l)晶面擇優(yōu)取向。SEM形貌表明材料組織致密且有層狀結(jié)構(gòu)特征。Ga和K雙摻雜可使Bi0.5Sb1.5Te3在室溫附近的Seebeck系數(shù)有一定的提高，而雙摻雜樣品的電導(dǎo)率均得到了不同程度的提高，其中Ga0.02Bi0.5Sb1.42K0.06Te3-樣品的電導(dǎo)率得到較明顯的改善。在300~500 K測量溫度范圍內(nèi)，所有雙摻雜樣品的熱導(dǎo)率高于Bi0.5Sb1.5Te3的熱導(dǎo)率，在300 K附近雙摻雜樣品的ZT值得到提高，其中Ga0.02Bi0.5Sb1.42K0.06Te3樣品在300 K時(shí)ZT值達(dá)到1.5。

    Abstract:

    Ga and K dual doped Bi0.5Sb1.5Te3 thermoelectric materials were prepared by vacuum melting and hot pressing. XRD results indicate that all the characteristic peaks of the bulk Ga0.02Bi0.5Sb1.48-xKxTe3 can be indexed into Bi0.5Sb1.5Te3, but the diffraction peaks of the dual doped samples slightly lean to the left. Hot-pressed bulk materials exhibit the (00l) preferred orientation. SEM morphology shows that microstructure is dense and layered structure. The Seebeck coefficient of Bi0.5Sb1.5Te3 near the room temperature can be improved to some extent by Ga and K dual doping. The electrical conductivity of dual doped samples can be improved in different degrees, and electrical conductivity of Ga0.02Bi0.5Sb1.42K0.06Te3 samples is improved obviously. In the whole measured temperature range of 300~500 K, the thermal conductivity of the dual doped samples is higher than that of Bi0.5Sb1.5Te3. ZT values of the dual doped samples are improved at near 300 K, and the ZT value of Ga0.02Bi0.5Sb1.42K0.06Te3 sample reaches 1.5 at 300 K.

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段興凱,胡孔剛,丁時(shí)鋒,滿達(dá)虎,張汪年,馬明亮. Ga、K雙摻雜P型Bi0.5Sb1.5Te3材料的制備及熱電性能[J].稀有金屬材料與工程,2015,44(3):759~762.[Duan Xingkai, Hu Konggang, Ding Shifeng, Man Dahu, Zhang Wangnian, Ma Mingliang. Preparation and Thermoelectric Properties of Ga and K Dual Doped P-Type Bi0.5Sb1.5Te3[J]. Rare Metal Materials and Engineering,2015,44(3):759~762.]
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  • 收稿日期:2014-03-15
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  • 在線發(fā)布日期: 2015-05-29
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