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Thermophysical Properties of CeB6 and PrB6 at subambient temperatures

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Abstract

Equilibrium adiabatic heat-capacity measurements have been made on zone refined samples of CeB6 and PrB6. Companion measurements made on LaB6, NdB6, and GdB6 have been reported elsewhere. These show cooperative lambda-type anomalies associated with antiferro-magnetic ordering. Except for lanthanum hexaboride, Schottky internal crystal field levels result in significant contributions to the thermodynamic functions. The gross thermodynamic properties at 298.15 K heat capacity (Cp/R), entropy increment (ΔT 0,m S 0/R), and Gibbs energy function are correlated with the nature of the lanthanide. For LaB6, CeB6, PrB6, NdB6, and GdB6 the three properties are, respectively: {11.654, 12.014, 11.997, 11.916, 11.695} Cp/R; {10.001, 11.803, 12.430, 12.558, 13.982} S0/R, and finally {4.379, 5.912, 6.232, 6.451, 7.905}Φ0 m/R.

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Authors and Affiliations

  1. Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109-1055, USA

    E. F. Westrum, B. H. Justice, H. L. Clever & D. A. Johnson

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  1. E. F. Westrum
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  2. B. H. Justice
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  3. H. L. Clever
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  4. D. A. Johnson
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Westrum, E.F., Justice, B.H., Clever, H.L. et al. Thermophysical Properties of CeB6 and PrB6 at subambient temperatures. Journal of Thermal Analysis and Calorimetry 70, 361–369 (2002). https://doi.org/10.1023/A:1021603902927

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