集成技术2025，Vol.14Issue(6)：35-46,12.DOI:10.12146/j.issn.2095-3135.20250809001
p型Yb填充方钴矿材料塞贝克系数与晶格热导率的协同优化
Synergistic Optimization of Seebeck Coefficient and Lattice Thermal Conductivity in p-type Yb-filled Skutterudites
摘要
Abstract
In thermoelectric materials,electrical transport and thermal transport are strongly coupled.Filled skutterudite materials enable electrical transport through their atomic framework,while the filler atoms scatter phonons,making them typical"electron crystals-phonon glasses".This study systematically investigates the influence of Yb filling amount on the microstructure and thermoelectric transport properties of p-type skutterudite materials YbₓFe3CoSb12.X-ray diffraction results show that all samples exhibit a main phase with cubic skutterudite structure.When x≥0.90,the impurity phases of FeSb2 and Sb significantly decrease,and the purity of the main phase is remarkably improved.Scanning electron microscopy observations reveal that Yb doping promotes grain homogenization and densification,and energy-dispersive X-ray spectroscopy analysis confirms that the uniformity of Yb element distribution is closely related to the doping level.Thermoelectric property measurements indicate that appropriate Yb filling significantly enhances the Seebeck coefficient,reaching 152 μV/K at 750 K for x=1.00.Meanwhile,the x=0.90 sample exhibits excellent electrical conductivity and power factor.Thermal conductivity analysis shows that Yb filling effectively reduces the lattice thermal conductivity,with the lattice thermal conductivity of the x=1.00 sample decreasing to 1.2 W/(m·K)at 650 K.Ultimately,the x=1.00 sample achieves a maximum thermoelectric figure of merit value of 0.74 at 750 K,representing an improvement of approximately 12%compared to previously reported results.These findings validate the synergistic advantages of Yb filling combined with the melt-hot pressing process in enhancing the comprehensive thermoelectric performance of p-type skutterudite materials,providing an effective pathway for structural regulation and engineering preparation of high-performance thermoelectric materials.关键词
填充方钴矿/熔融-热压工艺/晶格热导率/热电优值Key words
filled skutterudite/melt-hot press process/lattice thermal conductivity/thermoelectric figure of merit分类
化学化工引用本文复制引用
马富民,闵二标,谭英华,孙世宽,刘睿恒..p型Yb填充方钴矿材料塞贝克系数与晶格热导率的协同优化[J].集成技术,2025,14(6):35-46,12.基金项目
国家重点研发计划项目(2024YFB3813801) （2024YFB3813801）
广东省杰出青年基金项目(2022B1515020066) （2022B1515020066）
国家自然科学基金面上项目(52472268,62004211) This work is supported by National Key Research and Development Program of China(2024YFB3813801),Guangdong Basic and Applied Basic Research Foundation(2022B1515020066),National Natural Science Foundation of China(52472268,62004211) （52472268,62004211）
