Accession Number : AD0262535

Title :   HEAT CAPACITY AND ENTROPY OF CUC12 AND CRC12 FROM 11 TO 300 K. MAGNETIC ORDERING IN LINEAR CHAIN CRYSTALS

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

Personal Author(s) : Stout,J. W. ; Chisholm,R. C.

Report Date : AUG 1961

Pagination or Media Count : 1

Abstract : The heat capacities of CuCl2 and CrCl2 have been measured between 11 and 300 K. The contributions to the entropy and heat capacity arising from the ordering of the magnetic moments are evaluated. Maxima in the heat capacity are found at 23.91 + or - 0.1 K for CuCl2 and 16.06 + or 0.05 K for CrCl2. Both compounds show gradual maxima in the magnetic contribution to the heat capacity at higher temperatures. By use of the Ising model to describe interactions within a chain and a molecular field to describe the secondary interactions, an approximate theoretical treatment is given. Smooth values of the heat capacity, entropy, enthalpy, and free energy are tabulated at selected temperatures. (Author)

Descriptors :   *ANTIFERROMAGNETISM, *CHLORIDES, *CHROMIUM COMPOUNDS, *COPPER COMPOUNDS, CRYSTAL LATTICES, CRYSTAL STRUCTURE, CRYSTALS, ENTHALPY, ENTROPY, MAGNETIC MOMENTS, MAGNETIC PROPERTIES, NUCLEAR MAGNETIC MOMENTS, QUANTUM THEORY, THERMODYNAMICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE