Rapid synthesis of inorganic [Ca24Al28O64]4+(e-)4 electride and its performance as an electron thermal emitter

被引：25

作者：

Li, Fan ^{[1
]}

Zhang, Xin ^{[1
]}

Liu, Hongliang ^{[1
]}

Zhao, Jiping ^{[1
]}

Xiao, Yixin ^{[1
]}

Feng, Qi ^{[1
]}

Zhang, Jiuxing ^{[2
]}

机构：

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

[2] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China

来源：

VACUUM | 2018年 / 158卷

基金：

中国国家自然科学基金;

关键词：

Mayenite electride; SPS process; Thermionic emission; TEMPERATURE STABLE ELECTRIDE; CENTER-DOT 7AL(2)O(3); REFRACTORY OXIDE; FIELD; CONVERSION; CATALYST; STATE; ION; RU;

D O I：

10.1016/j.vacuum.2018.09.055

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We propose an effective and rapid route for synthesizing polycrystalline mayenite electride (C12A7:e(-)) in dense bulk. C12A7:e(-) bulks with high-density electron doping were obtained via a comprehensive method, which combined Ti powder treatment with spark plasma sintering (SPS) process under a 10(-2)Pa vacuum. The resulting electride, which exhibits an electron concentration of similar to 2.3 x 10(21)cm(-3), an electrical conductivity of similar to 1.38 x 10(3)S/cm at 300 K, and an absorption peak at 2.5eV, was obtained via SPS process at 1150 degrees C for 20 min. Furthermore, thermionic emission from a flat surface of C12A7 electride was examined at temperatures of 973-1373 K and acceleration electrical field of 3000-35000 V/cm in a 10(-5) vacuum. A large current density of 1.68 A/cm(2) was obtained in the thermionic emission with an work function (phi(wp)) of 2.13eV for an applied electric field of 35000 V/cm. Moreover, the emission with a current density of 1.68 A/cm(2) was stably sustained for 30 h. These results not only suggest an efficient method for fabricating high-quality mayenite electrides but also pave a way for various applications including thermionic emission.

引用

页码：152 / 157

页数：6

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