中文摘要：

采用放电等离子烧结技术（简称SPS技术）及热处理制备了全致密纯稀土纳米晶Gd块体材料，研究了材料的微结构和磁性。X衍射结果表明材料在烧结过程中形成了一定程度的c轴织构。TEM观察显示，烧结态纳米晶Gd的平均晶粒尺度在10nm左右；热处理后，平均晶粒尺寸达到100nm。PPMS测试发现与粗晶Gd相比，纳米晶Gd的居里温度以及饱和磁化强度均有所下降。说明Gd的纳米化对其磁性具有重要影响。

英文摘要：

Spark Plasma Sintering （SPS） and subsequent annealing technique was applied to prepare full dense bulk nanocrystalline Gd metal. XRD results show that there is a pressure-induced C-axis crystal texture in the SPS and annealing Gd samples. TEM observation shows that SPS Gd metal has a single phase with a mean grain size of about 10 nm. After heat treatment, the grain size increases to 100 nm. With decrease of Gd grains from micrometer- to nanometer- size, the Curie temperature Tc is decreased by 11.7 K and the magnetic moment per Gd atom at 5 K drops evidently from 7.81 μB to 6.31 μB. These results indicate a remarkable influence of the nanostructure on the magnetism of Gd due to finite size effect.