Low temperature synthesis of low thermionic work function (LaₓBa₁₋ₓ)B₆

Title: Low temperature synthesis of low thermionic work function (LaₓBa₁₋ₓ)B₆
Creator: Hasan, M. M.; Cuskelly, D.; Sugo, H.; Kisi, E. H.
Relation: Journal of Alloys and Compounds Vol. 636, p. 67-72
Publisher Link: http://dx.doi.org/10.1016/j.jallcom.2015.02.105
Publisher: Elsevier
Resource Type: journal article
Date: 2015
Description: This study presents investigations of the microstructure, morphology and emission properties of the promising thermionic material (LaₓBa₁₋ₓ)B₆. The material was synthesised by solid-state reaction without post-synthesis purifications. Powder X-ray diffraction revealed that samples prepared at a temperature ≥1500 °C had formed a significant proportion of solid solution (above 54 mass%). Subsequent sintering at 1950 °C caused the formation of a mixture of three solid solutions with the dominant phase being (La_0.31Ba_0.69)B₆ ~85% (by mass). The Richardson work function and emission constant for this boride mixture were found to be 1.03 eV and 8.44 x 10^-6 A cm K^-2 respectively.
Subject: rare-earth hexaborides; solid-solution; Rietveld refinement; thermionic emission
Identifier: http://hdl.handle.net/1959.13/1336927
Identifier: uon:27727
Identifier: ISSN:0925-8388
Language: eng
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