Accession Number : AD0262537

Title :   HEAT CAPACITY AND ENTROPY OF COC12 AND MNC12 FROM 11 TO 300 K. THERMAL ANOMALY ASSOCIATED WITH ANTIFERROMAGNETIC ORDERING IN COC12

Corporate Author : CHICAGO UNIV ILL INST FOR THE STUDY OF METALS

Personal Author(s) : CHISHOLM,R.C. ; STOUT,J.W.

Report Date : AUG 1961

Pagination or Media Count : 1

Abstract : The heat capacities of MnCl2 and CoCl2 have been measured between 11 and 300 K. The lattice and magnetic contributions to the heat capacity and entropy of MnCl2 were also evaluated. CoCl2 has a lambda peak in heat capacity at 24.71 + or - 0.05 K associated with the cooperative ordering of the magnetic moments of the cobaltous ions. The entropy change associated with this cooperative ordering is R 1n 2. Smooth values of the heat capacity, entropy, enthalpy, and free energy are tabulated at selected temperatures. (Author)

Descriptors :   *ANTIFERROMAGNETISM, *CHLORIDES, *COBALT COMPOUNDS, *MANGANESE COMPOUNDS, *THERMODYNAMICS, ATOMIC ENERGY LEVELS, ATOMIC ORBITALS, CRYSTAL LATTICES, CRYSTAL STRUCTURE, CRYSTALS, ELECTRON TRANSITIONS, ENTHALPY, ENTROPY, EXCITATION, MAGNETIC MOMENTS, MAGNETIC PROPERTIES, QUANTUM THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE