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The effect of precursor boron nanopowder on the microstructure and emission properties of LaB~6~cathode materials by Li‐Hong Bao; Jiu‐Xing Zhang; Shen‐Lin Zhou; Yong‐Feng Wei; Zhi‐He Dou is a Engineering article available to read on EtoBox.

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## Abstract Two different structured boron sources have been used for the fabrication of LaB~6~ ceramics and their effects on the sintering temperature, microstructure and emission properties were investigated. The results show that the reaction temperature of amorphous boron and La to form LaB~6~ is 1200 °C, which is 150 °C lower than the reaction using crystalline boron. The grain size of LaB~6~ prepared by amorphous boron and La is 150 nm, which is much smaller than that of crystalline boron ∼2 μm at the same sintering condition. With the grain size decreasing from 5 μm to 150 nm, the LaB~6~ thermionic emission current density increases significantly and the field emission turn‐on field decreases from 1500 V to 1300 V. Using amorphous boron nanopowder can not only enhance the microstructure but also improve the emission properties. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Author

Li‐Hong Bao; Jiu‐Xing Zhang; Shen‐Lin Zhou; Yong‐Feng Wei; Zhi‐He Dou

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley - V C H Verlag GmbbH & Co.; Wiley (ISSN 1862-6351)

Published

2011

Language

EN

Field

Engineering (Physical Sciences)