Magnesium diboride: An effective light-to-heat conversion material in solid-state

We report herein a giant light-to-heat transduction observed in bulk magnesium diboride (MgB2) on exposure to incoherent, continuous wave, broadband light-sources. The heat-flow from the sample was accurately determined using photocalorimetry, to register an ultrahigh value of 45 W/g upon irradiatio...

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Bibliographic Details
Published in:Applied physics letters 2017-07, Vol.111 (3)
Main Authors: John, Saju K., John, Daughty, Bijoy, N., Chathanathodi, Raghu, Anappara, Aji A.
Format: Article
Language:English
Subjects:
Applied physics
Borides
Broadband
Continuous radiation
Irradiance
Irradiation
Light sources
Magnesium compounds
Mercury lamps
Mercury vapor
Photothermal conversion
Thermoelectric generators
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Summary:We report herein a giant light-to-heat transduction observed in bulk magnesium diboride (MgB2) on exposure to incoherent, continuous wave, broadband light-sources. The heat-flow from the sample was accurately determined using photocalorimetry, to register an ultrahigh value of 45 W/g upon irradiation with a low-pressure mercury vapour lamp (λ ∼ 250–450 nm; irradiance ∼800 mW/cm2) with a photo-to-thermal conversion efficiency of about 83% (with an error of ±1.86%). As a practical application, light-induced heat was used to generate electrical power using a thermoelectric generator (open voltage ∼125 mV, when illuminated by a solar simulator). The bulk MgB2 powder was found to be photo-stable under different irradiation conditions, and the photothermal effect was found to be highly reproducible.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4994154