Low Temperature Synthesis of Rare-Earth Hexaborides for Solar Energy Conversion
University of Newcastle, Callaghan NSW 2308, AUSTRALIA .
a Corresponding author: Muhammad.Hasan@uon.edu.au
Thermionic energy conversion is an ideal way of converting concentrated solar energy into electricity. Developing suitable emitter/collector materials, with optimum work functions whilst being able to withstand elevated temperatures under high vacuum conditions, is a major challenge. Rare-earth hexaborides have great potential as thermionic emitters due to their superior chemical stability and low work function values, lanthanum hexaboride (ϕ~2.60eV) and cerium hexaboride (ϕ~2.60eV). This study forms part of a series of investigations aimed at developing rare-earth hexaboride cathode materials. Methods used to synthesise, characterise and fabricate these materials are discussed together with electron emission results
© Owned by the authors, published by EDP Sciences, 2014
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