中国物理B ›› 2011, Vol. 20 ›› Issue (5): 58101-058101.doi: 10.1088/1674-1056/20/5/058101
特古斯1, 包黎红2, 张久兴2, 周身林2
Bao Li-Hong(包黎红)a), Zhang Jiu-Xing(张久兴) a)†, Zhou Shen-Lin(周身林)a), and Tegus(特古斯) b)
摘要: Polycrystalline rare-earth hexaborides (NdxGd1-x)B6 (x = 0, 0.2, 0.6, 0.8, 1) were prepared by the reactive spark plasma sintering (SPS) method using mixed powder of GdH2, NdH2 and B. The effects of Nd doping on the crystal structure, the grain orientation, the thermionic emission and the magnetic properties of the hexaboride were investigated by X-ray diffraction, electron backscattered diffraction and magnetic measurements. It is found that all the samples sintered by the SPS method exhibit high densities (> 95%) and high values of Vickers hardness (2319 kg/mm2). The values are much higher than those obtained in the traditional method. With the increase of Nd content, the thermionic emission current density increases from 11 to 16.30 A/cm2 and the magnetic phase transition temperature increases from 5.85 to 7.95 K. Thus, the SPS technique is a suitable method to synthesize the dense rare-earth hexaborides with excellent properties.
中图分类号: (Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))