Creation of Yb2O3 Nanoprecipitates Through an Oxidation Process in Bulk Yb-Filled Skutterudites
Creation of Yb2O3 Nanoprecipitates Through an Oxidation Process in Bulk Yb-Filled Skutterudites
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DOI：
10.1007/s11664-012-2370-5
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发表时间：
2013-01
影响因子：
2.1
通讯作者：
Juan Ding;H. Gu;P. Qiu;Xi-hong Chen;Z. Xiong;Q. Zheng;Xun Shi;Lidong Chen
中科院分区：
文献类型：
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作者：
Juan Ding;H. Gu;P. Qiu;Xi-hong Chen;Z. Xiong;Q. Zheng;Xun Shi;Lidong Chen
提出了一种通过控制填充剂的氧化过程在体相填充方钴矿中原位引入纳米沉淀物的方法。选择Yb0.3Co4Sb12作为基体材料，在密封石英管中在低压氧下高温长时间氧化导致形成Yb2O3纳米夹杂物。透射电子显微镜显示，Yb2O3纳米沉淀物内的方钴矿晶粒内创建通过内部氧化机制。随着氧化时间的增加，Yb2O3纳米沉淀物的量增加，并且纳米沉淀物更均匀地分布在基体中。对于氧化10天的样品，晶格热导率降低了约19%，在850 K相比，Yb0.3Co4Sb12矩阵。晶格热导率的减少源于由Yb2O3纳米沉淀物的额外声子散射，导致最大ZT为1.3。
An approach to introduce in situ nanoprecipitates into bulk filled skutterudites is developed through controlling the oxidation process of the fillers. Yb0.3Co4Sb12 is selected as the base material, and prolonged oxidation at high temperatures in sealed quartz tubes under a low pressure of oxygen leads to the formation of Yb2O3 nanoinclusions. Transmission electron microscopy shows that the Yb2O3 nanoprecipitates are created within the skutterudite crystal grains through an internal oxidation mechanism. With increased time of oxidation, the amount of Yb2O3 nanoprecipitates is increased and the nanoprecipitates are more uniformly distributed in the matrix. For the samples oxidized for 10 days, the lattice thermal conductivity is reduced by about 19% at 850 K compared with the Yb0.3Co4Sb12 matrix. The reduction in the lattice thermal conductivity originates from additional phonon scattering by the Yb2O3 nanoprecipitates, leading to a maximum ZT of 1.3.