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 irradiation with a low-pressure mercury vapour lamp (lambda similar to 250-450 nm; irradiance similar to 800 mW/cm(2)) 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 similar to 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. Published by AIP Publishing.