- 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 (La0.31Ba0.69)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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