Abstract
A 15 kVa, 450 kHz radio frequency generator was used to levitate and melt cerium samples ranging in size from 0.4 to 1.7 g. The molten cerium samples were then dropped into a copper block calorimeter contained in isothermal surroundings. The cerium data between 1400 and 1700/sup 0/K indicated a nonlinear heat content function as described by the equation: H/sub T/ -- H/sub 298/./sub 15/ = --0.01255 T/sup 2/ + 75.305 T -- 32,995.401 J/mol. The correlation coefficient for the curve fitting process was 0.81. The data between 1700 and 2500/sup 0/K indicated a linear heat content function as described by the equation: H/sub T/ - H/sub 298/./sub 15/ = (31.616 +- 0.596)(T - 1077) + (38,917.267 +- 575.049) J/mol. The average percent deviation between this and the experimental values was 0.67. Experimental heat contents were corrected for convection and radiation heat losses during the fall of the sample from the levitation chamber into the calorimeter. The maximum estimated error for the levitation calorimetry work was +-2.5 percent.
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