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Low temperature specific heats and related thermodynamical functions of neodymium dihydride NdH 2.00 . crystal field effects
Author(s) -
Biegański Z.
Publication year - 1971
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220470109
Subject(s) - neodymium , heat capacity , chemistry , enthalpy , adiabatic process , calorimetry , atmospheric temperature range , ion , thermodynamics , crystal (programming language) , physics , laser , organic chemistry , optics , computer science , programming language
The heat capacity of neodymium dihydride NdH 2.00 was measured over the low‐temperature range by adiabatic calorimetry. At 298.15 K the measured heat capacity at constant pressure ( C p ), the entropy ( S 0 ), the enthalpy function ( H 0 – H 0 0 ), and the Gibbs function–[( F 0 – H 0 0 )/ T ] are: 10.29 cal mol −1 deg −1 , 14.08 cal mol −1 deg −1 , 1882 cal mol −1 , and 7.76 cal mol −1 deg −1 , respectively. The influence of the crystal field of cubic symmetry on the splitting of the ground level 4 I 9/2 of the Nd 3+ ion was analysed, and the conclusion was drawn that the quartet Γ 8 1is the lowest‐lying level. This supports the idea of the anion‐like character (hydridic model) of hydrogen in this hydride.