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The heat capacities and heat content of molten cerium by levitation calorimetry

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Abstract

A 15 kva, 450 khz radio frequency generator was used to levitate and melt cerium sam-ples ranging in size from 0.4 gms to 1.7 gms. The molten cerium samples were then drop-ped into a copper block calorimeter contained in isothermal surroundings. The cerium data between 1400 K and 1700 K indicated a nonlinear heat content function as described by the equation:H T -H 298.15 = -0.01255T 2 + 75.305T - 32,995.401 J/mol. The correlation coefficient for the curve fitting process was 0.81. The data between 1700 K and 2500 K indicated a linear heat content function as described by the equation:H T-H 298.15 ={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. Experi-mental 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 esti-mated error for the levitation calorimetry work was ±2.5 pct.

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Authors and Affiliations

  1. Atlantic Richfield Corporation, 75701, Tyler, TX

    Lyle K. Kuntz

  2. Ames Laboratory, USERDA, Iowa State University, 50011, Ames, IA

    Renato G. Bautista (Associate Professor of Chemical Engineering and Group Leader)

Authors
  1. Lyle K. Kuntz
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  2. Renato G. Bautista
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Formerly Graduate Assistant, Department of Chemical Engineering, Iowa State University

Prepared for the Energy Research and Development Administration under Contract No. W-7405-eng-82.

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Kuntz, L.K., Bautista, R.G. The heat capacities and heat content of molten cerium by levitation calorimetry. Metall Trans B 7, 107–113 (1976). https://doi.org/10.1007/BF02652826

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