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2017 ; 7
(1
): 718
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Lanthanum hexaboride for solar energy applications
#MMPMID28386129
Sani E
; Mercatelli L
; Meucci M
; Zoli L
; Sciti D
Sci Rep
2017[Apr]; 7
(1
): 718
PMID28386129
show ga
We investigate the optical properties of LaB(6) - based materials, as possible
candidates for solid absorbers in Concentrating Solar Power (CSP) systems. Bulk
LaB(6) materials were thermally consolidated by hot pressing starting from
commercial powders. To assess the solar absorbance and spectral selectivity
properties, room-temperature hemispherical reflectance spectra were measured from
the ultraviolet to the mid-infrared, considering different compositions,
porosities and surface roughnesses. Thermal emittance at around 1100?K has been
measured. Experimental results showed that LaB(6) can have a solar absorbance
comparable to that of the most advanced solar absorber material in actual plants
such as Silicon Carbide, with a higher spectral selectivity. Moreover, LaB(6) has
also the appealing characteristics to be a thermionic material, so that it could
act at the same time both as direct high-temperature solar absorber and as
electron source, significantly reducing system complexity in future concentrating
solar thermionic systems and bringing a real innovation in this field.