Synthesis, thermionic emission and magnetic properties of (NdxGd1-x)B6

doi:10.1088/1674-1056/20/5/058101

Abstract Polycrystalline rare-earth hexaborides (Nd_xGd_1-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.

Keywords: rare-earth hexaborides spark plasma sintering emission property

Received: 27 November 2010
Revised: 17 January 2011
Accepted manuscript online:

PACS:	81.05.Je	(Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))
	61.66.Fn	(Inorganic compounds)
	75.50.Ee	(Antiferromagnetics)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50871002).

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Bao Li-Hong(包黎红), Zhang Jiu-Xing(张久兴), Zhou Shen-Lin(周身林), and Tegus(特古斯) Synthesis, thermionic emission and magnetic properties of (Nd_xGd_1-x)B₆ 2011 Chin. Phys. B 20 058101

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Synthesis, thermionic emission and magnetic properties of (Nd_xGd_1-x)B₆