Abstract
Construction of a fully automated adiabatic heat-capacity calorimeter which has been successfully operated at temperatures from 13 K to 530 K is reported. This calorimeter has been designed specially so as remarkably to economize liquid helium: 7 dm 3 of liquid helium was enough to cool the apparatus from 77 K to 10 K and to measure heat capacities from 13 K upwards. Its performance has been examined by measurements on the standard reference materials: benzoic acid (NBS SRM39i) from 15 K to 305 K and synthetic sapphire (α-Al 2 O 3 : NBS SRM720) from 60 K to 505 K. The results are compared with those of other investigators. Overall precision assessed as deviations from a smoothed curve is within ±0.0005· C p or better, while the inaccuracy is within ±0.0025· C p except for the temperature regions below about 25 K and above about 400 K.
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