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

被引：8

作者：

Bao Li-Hong ^{[1
]}

Zhang Jiu-Xing ^{[1
]}

Zhou Shen-Lin ^{[1
]}

Tegus ^{[2
]}

机构：

[1] Beijing Univ Technol, Key Lab Adv Funct Mat, Minist Educ, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

[2] Inner Mongolia Normal Univ, Inner Mongolia Key Lab Phys & Chem Funct Mat, Coll Phys & Electron Informat, Hohhot 010022, Peoples R China

来源：

CHINESE PHYSICS B | 2011年 / 20卷 / 05期

基金：

中国国家自然科学基金;

关键词：

rare-earth hexaborides; spark plasma sintering; emission property; HEXABORIDES; VAPORIZATION; TEMPERATURE; PLASMA; SYSTEM; CEB6; LAB6; GDB6;

D O I：

10.1088/1674-1056/20/5/058101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Polycrystalline rare-earth hexaborides (NdxGd1-x)B-6 (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/mm(2)). 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/cm(2) 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.

引用

页数：6

共 21 条

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