Ba掺杂对稀土硼化物GdB6结构, 晶粒取向和热发射性能的影响

doi:10.3724/SP.J.1077.2011.11152

无机材料学报 ›› 2011, Vol. 26 ›› Issue (10): 1116-1120.DOI: 10.3724/SP.J.1077.2011.11152 CSTR: 32189.14.SP.J.1077.2011.11152

• 研究快报 • 上一篇

Ba掺杂对稀土硼化物GdB₆结构, 晶粒取向和热发射性能的影响

包黎红, 张久兴, 周身林

(北京工业大学材料学院新型功能材料教育部重点实验室, 北京100124)

收稿日期:2011-03-14 修回日期:2011-04-18 出版日期:2011-10-20 网络出版日期:2011-09-20
作者简介:BAO Li-Hong (1983-), male, candidate of PhD. E-mail: baolihong_10@yahoo.com.cn
基金资助:
National Natural Science Foundation of China (50871002

Effect of Ba-doping on the Structural, Grain Orientation and Thermionic Emission Properties of Hexaboride GdB₆

BAO Li-Hong, ZHANG Jiu-Xing, ZHOU Shen-Lin

(Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124,China)

Received:2011-03-14 Revised:2011-04-18 Published:2011-10-20 Online:2011-09-20
About author:BAO Li-Hong (1983-), male, candidate of PhD. E-mail: baolihong_10@yahoo.com.cn
Supported by:
National Natural Science Foundation of China (50871002

摘要/Abstract

摘要： 采用反应放电等离子烧结技术, 以BaH₂, GdH₂纳米粉和B粉为原料, 成功制备了多晶稀土硼化物(Ba_xGd_1-x)B₆ (x=0, 0.2, 0.4, 0.8). 采用XRD、EBSD技术研究了掺杂元素Ba对GdB₆晶体结构及晶粒取向的影响, 并测量不同温度下的热发射性能. 结果表明, 所有烧结样品与传统烧结方法相比, 具有高致密度(>97%)和很高的维氏硬度(2070 kg/mm²). GdB6 在1873 K时, 最大发射电流密度为11 A/cm², 该值远高于传统方法制备的电流密度值. 随着Ba含量的增加, 发射电流密度从11 A/cm² 减小到2.25 A/cm².

null

关键词: 稀土硼化物, 放电等离子烧结, 发射性能, 掺杂

Abstract: The polycrystalline rare-earth hexaborides (Ba_xGd_1-x)B₆(x = 0, 0.2, 0.4, 0.8) were prepared by the reactive spark plasma sintering (SPS) method using mixed powder of BaH₂, GdH₂ and B. The effects of Ba doping content on the crystal structure, the grain orientation and the thermionic emission properties of the GdB₆ were investigated by X-ray diffraction, electron backscattered diffraction and emission current measurements. It is found that all the sintered samples exhibit high densification (> 97%) and high value of Vickers hardness (2070 kg/mm²). The maximum thermionic emission current density of GdB₆is 11 A/cm² at a cathode temperature of 1873 K, which is much higher than that of traditional method. With the increase of Ba content, the thermionic emission current density decreases from 11 A/cm²to 2.25 A/cm²at 1873 K.

Key words: rare-earth hexaborides, spark plasma sintering, emission property, doping

中图分类号:

TB34

包黎红, 张久兴, 周身林. Ba掺杂对稀土硼化物GdB₆结构, 晶粒取向和热发射性能的影响[J]. 无机材料学报, 2011, 26(10): 1116-1120.

BAO Li-Hong, ZHANG Jiu-Xing, ZHOU Shen-Lin. Effect of Ba-doping on the Structural, Grain Orientation and Thermionic Emission Properties of Hexaboride GdB₆[J]. Journal of Inorganic Materials, 2011, 26(10): 1116-1120.

参考文献

[1] Nishitani R, Aono M, TanaKa T, et al. Surface states on the LaB6(100), (110) and (111) clean surfaces studied by angle-resolved UPS. Surf. Sci., 1980, 95(2/3): 341-358.

[2] Goebel D M, Watkins R M, Jameson K K. LaB6 hollow cathodes for ion and hall thrusters. J. Propul. Powder, 2007, 23(3): 552-558.

[3] Choi Y W, Cho C, Choi Y S, et al. Development of a 30 kW plasma gun system with a long lifetime. IEEE Trans. Plasma Sci., 2008, 36(5): 2765-2769.

[4] Swanson L W, McNeely D R. Work functions of the (001) face of the hexaborides of Ba, La, Ce and Sm. Surf. Sci., 1979, 83(1): 11-28.

[5] Zhou S L, Zhang J X, D. M. Liu, et al. Properties of CeB6 cathode fabricated by spark plasma reactive liquid phase sintering method. J. Inorg. Mater., 2009, 24(4): 793-797.

[6] Reiffers M, Sebek J, Santava E, et al. Thermal hysteresis of the phase-transition temperature of single-crystal GdB6. Phys. Stat. Sol. (b), 2006, 243(1): 313-316.

[7] Luca S E, Amara M, Galera R M, et al. Neutron differaction studies on GdB6 and TbB6 powders. Physica B, 2004, 350: e39-e42.

[8] Cheng H, Jiang J P. Cathode Electronics. Northwest Institute of Telecommunication Publishing House, 1986: 85-86.

[9] Zhang H, Zhang Q, Zhao G P, et al. Single-crystalline GdB6 nanowire field emiters. J. Am. Chem. Soc., 2005, 127(38): 13120-13121.

[10] Storms E K, Mueller B A. Thermionic emission and atom vaporization of the Gd-B system. J. Appl. Phys., 1981, 52(4): 2966-2969.

[11] Schmidt P H, Joy D C. Low work function electron emitter hexaborides. J. Vac. Sci. Technol., 1978,15(6): 1809-1810.

[12] Ma R G, Liu D M, Zhou S L, et al. Fabrication and emission property of polycrystalline La0.4Pr0.6B6 bulk prepared by spark plasma sintering. J. Inorg. Mater., 2010, 25(7): 1-5.

[13] Liu S P, Yang Q S, Chen W P, et al. Development of RE multiple boride (La0.55Ba0.45)B6 and (La0.4Eu0.6)B6 cathode materials. Rare Metals and Cemented Carbides., 2006, 34(3): 8-11.

[14] Zhou S L, Zhang J X, Liu D M, et al. Fabrication and charact erization of high—purity nanostructured bulk LaB6 polycrystal cathode material. J. Inorg. Mater., 2008, 23(6): 1199-1204.

[15] Zhou S L, Zhang J X, Liu D M, et al. Synthesis and properties of nanostructured dense LaB6 cathodes by arc plasma and reactive spark plasma sintering. Acta Mater., 2010, 58(15): 4978-4985.

[16] Uijttewaal M A, DeWijs G A, Groot R A. Ab initio and work function and surface energy anisotropy of LaB6. J. Phys. Chem. B, 2006, 110(37): 18459-18465.

[17] Gesley M, Swanson L W. A determination of the low work function planes of LaB6. Surface Science, 1984, 146(2/3): 583-599.

Ba掺杂对稀土硼化物GdB₆结构, 晶粒取向和热发射性能的影响

Effect of Ba-doping on the Structural, Grain Orientation and Thermionic Emission Properties of Hexaboride GdB₆

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