(1. 浙江大學(xué) 硅材料國家重點(diǎn)實(shí)驗(yàn)室， 杭州 310027;
2. 太原理工大學(xué) 材料科學(xué)與工程學(xué)院， 太原 030024)
摘 要: 用溶劑熱法合成了二元Bi2Te3和三元Bi1.3Sn0.7Te3合金納米粉末， 并采用熱壓技術(shù)制備了塊狀熱電材料。 XRD分析結(jié)果表明： Bi-Sn-Te三元固溶體合金可以直接通過溶劑熱合成獲得單相產(chǎn)物， 而非摻雜Bi2Te3合金需要通過熱壓等后熱處理來實(shí)現(xiàn)產(chǎn)物的單一化； 熱壓過程有助于促進(jìn)反應(yīng)的完全和晶型的完整， 但會(huì)導(dǎo)致晶粒的長大。 對試樣電導(dǎo)率σ和Seebeck系數(shù)α的測量結(jié)果顯示， Bi-Sn-Te三元固溶體合金比二元Bi-Te合金具有更好的電學(xué)性能。
關(guān)鍵字: 熱壓； 溶劑熱合成；Bi2Te3基合金； 熱電材料； 電學(xué)性能
prepared by solvothermal synthesis
（1. State Key Laboratory of Silicon Materials,
Zhejiang University, Hangzhou 310027, China;
2. Institute of Materials Science and Engineering,
Taiyuan University of Technology, Taiyuan 030024, China）
Abstract: Binary Bi2Te3 and ternary Bi1.3Sn0.7Te3 thermoelectric samples were prepared by hot pressing from the solvothermally synthesized nano-powders. The XRD analyses show that a single-phased ternary Bi-Sn-Te alloy can be obtained directly by solvothermal synthesis. Hot pressing can facilitate the integrality of reaction and the crystalline structure, but will induce the grain growth. The measured results of electric conductivity(σ) and Seebeck coefficients(α) of the samples indicate that the ternary Bi-Sn-Te alloy has better electric properties than the binary Bi-Te alloy does.
Key words: hot pressing; solvothermal synthesis; Bi2Te3 based alloys; thermoelectric materials; electric properties
