Ni掺杂提高Cu_(12)Sb_4S_(13-delta)黝铜矿热电性能

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作者孙富华 ; 董金峰 ; Dey Shaugath ; Asfandiyar ; 吴超峰 ; 潘瑜 ; 唐怀超 ; 李敬锋
作者Sun Fuhua ; Dong Jinfeng ; Dey Shaugath ; Asfandiyar ; Wu Chaofeng ; Pan Yu ; Tang Huaichao ; Li Jingfeng
单位School of Materials Science and Engineering,Tsinghua,State Key Laboratory of New Ceramics and Fine Processing,China;School of Materials Science and Engineering,Tsinghua,State Key Laboratory of New Ceramics and Fine Processing,China;School of Materials Science and Engineering,Tsinghua,State Key Laboratory of New Ceramics and Fine Processing,China;School of Materials Science and Engineering,Tsinghua,State Key Laboratory of New Ceramics and Fine Processing,China;School of Materials Science and Engineering,Tsinghua,State Key Laboratory of New Ceramics and Fine Processing,China;School of Materials Science and Engineering,Tsinghua,State Key Laboratory of New Ceramics and Fine Processing,China;School of Materials Science and Engineering,University of,NSW,2052,Australia;School of Materials Science and Engineering,Tsinghua,Graduate School at Shenzhen,State Key Laboratory of New Ceramics and Fine,Shenzhen,Beijing,100084,518055;100084;2052.收起
关键词nickel doping ; tetrahedrite ; thermoelectric
来源中国科学(材料科学)
出版年2018
期号第9期
摘要
Cu_(12)Sb_4S_(13)是一种储量丰富、环境友好的天然矿物, 被热电领域普遍关注. 本研究旨在揭示Ni掺杂提高黝铜矿材料热电性能的机理.采用机械合金化(MA)结合放电等离子体烧结(SPS)的方法制备出Cu_(12-x)Ni_xS b_4S_(13-delta) (x = 0.5, 0.7, 1.0, 1.5, 2.0)样品. 实验结果表明, 在测量温度范围内(323-723 K), 随着Ni含量的增加, 样品的热导率急剧下降(< 0.9 W m~(-1) K~(-1)), 同时热电功率因子逐渐增加. 理论模型计算表明, 晶格热导率的降低主要来源于Ni掺杂引起的析出相及位错对中频声子的强散射作用. 由于较低的热导率和较高的功率因子, Cu_(11)NiSb_4S_(13-delta)样品在723 K时获得最高ZT值0.95, 相对于未掺杂样品, 其热电性能提高了46%. 同时, 热循环测试表明, 通过Ni掺杂提高了黝铜矿热电材料的化学稳定性.

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