熵调控抑制ZrNiSn基half-Heusler热电材料的晶格热导率  

Inhibition of Lattice Thermal Conductivity of ZrNiSn-based Half-Heusler Thermoelectric Materials by Entropy Adjustment

作　　者：王鹏将 康慧君 杨雄 刘颖 程成 王同敏[1] WANG Pengjiang;KANG Huijun;YANG Xiong;LIU Ying;CHENG Cheng;WANG Tongmin(Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;Key Laboratory of Material Modification by Laser,Ion and Electron Beams,Ministry of Education,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁省凝固控制与数字化制备技术重点实验室,大连116024 [2]大连理工大学三束材料改性教育部重点实验室,大连116024

出　　处：《无机材料学报》2022年第7期717-723,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(51971052,51774065);辽宁省“兴辽英才计划”(XLYC2007183,XLYC1808005);大连市科技创新基金(2020JJ25CY002,2020JJ26GX045)。

摘　　要：ZrNiSn基half-Heusler热电材料具有较高的热导率,限制了其热电性能进一步提高。为了降低晶格热导率,本研究采用磁悬浮熔炼和放电等离子烧结的方法制备ZrNiSn和Zr_(0.5)Hf_(0.5)Ni_(1-x)Pt_(x)Sn(x=0,0.1,0.15,0.2,0.25,0.3)高熵half-Heusler热电合金。在Zr位进行Hf原子替代,Ni位进行Pt原子替代以调控该合金的构型熵,并研究构型熵对热电性能的影响。本工作优化了Zr_(0.5)Hf_(0.5)Ni_(0.85)Pt_(0.15)Sn在673 K的最小晶格热导率和双极扩散热导率之和为2.1 W·m^(–1)·K^(–1),与ZrNiSn相比降低了约58%。这一发现为降低ZrNiSn基合金的晶格热导率提供了一种有效的策略,有助于改善材料的热电性能。The thermoelectric properties of ZrNiSn-based half-Heusler materials were hindered due to their high thermal conductivity.In order to reduce the lattice thermal conductivity,the high-entropy alloys ZrNiSn and Zr_(0.5)Hf_(0.5)Ni_(1-x)Pt_(x)Sn(x=0,0.1,0.15,0.2,0.25,0.3)were prepared by levitation melting and spark plasma sintering.Configurational entropy of the alloys was manipulated by Hf substitution for Zr and Pt substitution for Ni.Effects of configuration entropy on the thermoelectric properties were investigated.The reslults showed that the minimum sum of lattice thermal conductivity and bipolar thermal conductivity(κ_(l)+κ_(b))at 673 K for Zr_(0.5)Hf_(0.5)Ni_(0.85)Pt_(0.15)Sn was optimized at 2.1 W·m^(–1)·K^(–1),which was significantly reduced by about 58%when compared with ZrNiSn.This finding provides an effective strategy for reducing lattice thermal conductivity of ZrNiSn-based alloy to offer great potential for further improvement of thermoelectrics.

关 键 词：高熵 half-Heusler合金 热电材料 晶格热导率 

分 类 号：O472[理学—半导体物理]