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首页> 外文期刊>Journal of Materials Science >Thermal properties and microstructure of bulk nanocrystalline Gd material
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Thermal properties and microstructure of bulk nanocrystalline Gd material

机译：块状纳米晶G材料的热性能和微观结构

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摘要

Bulk nanocrystalline gadolinium (Gd) material has been consolidated from Gd nanoparticles using spark plasma sintering (SPS). High density (> 99.5%) bulk nanocrystalline material was achieved after sintering at a temperature of 280 A degrees C with a pressure of 500 MPa. Microstructure analysis shows that the consolidated bulk material exhibits a single phase with hexagonal close packed structure and a fine grain microstructure with a mean grain size of about 15 nm. The structural transformation from hexagonal condensed packed to face centered cubic was not observed, and the second-order magnetic transition remained in the nanocrystalline Gd sample. The Curie temperature of the nanocrystalline Gd decreased by more than 10.7 K below that of the coarse-grained. The activation energies for the coarse-grained and the as-consolidated Gd materials are 2.7702 and 1.0130 eV, respectively.
机译：大块纳米晶（（Gd）材料已使用火花等离子体烧结（SPS）从Gd纳米颗粒中固结。在280 A的温度和500 MPa的压力下烧结后，获得了高密度（> 99.5％）的块状纳米晶体材料。微观结构分析表明，固结的散装材料表现出具有六方密堆积结构的单相和平均晶粒尺寸约为15 nm的细晶粒微观结构。没有观察到从六角形压缩堆积到面心立方的结构转变，并且二阶磁性跃迁保留在纳米晶体Gd样品中。纳米晶Gd的居里温度比粗晶的居里温度降低了10.7 K以上。粗晶粒和固结Gd材料的活化能分别为2.7702和1.0130 eV。

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