Accession Number : AD0262900

Title :   THE SPECIFIC HEAT OF FEC12 . 4H20 BETWEEN 1.1 AND 20 K

Corporate Author : CARNEGIE INST OF TECH PITTSBURGH PA

Personal Author(s) : FRIEDBERG, S.A. ; COHEN, A.F. ; SCHELLENG, J.H.

Report Date : 22 AUG 1961

Pagination or Media Count : 1

Abstract : The specific heat of FeCl2.4H2O was measured between 1.1 and 20 K. A lambda-type anomaly is found at 1.26 K, the antiferromagnetic Neel point whose existence was inferred from previous observations of the magnetic susceptibility. An anomaly of the Schottky type is also found having its rounded maximum at about 3 K. It was possible to effect a reasonable separation of the lattice specific heat from the measured total and thus to determine the parameters of the Schottky anomaly. These anomalies are found to be consistent with the splitting of the spin quintet ground state of the Fe(++) ion into a lower doublet and upper triplet separated by about 5.7/cm. (Author)

Descriptors :   *HELIUM, *IRON COMPOUNDS, *PARAMAGNETIC MATERIALS, ANTIFERROMAGNETISM, CHLORIDES, CRYSTAL LATTICES, ELECTROSTATIC FIELDS, HEAT TRANSFER, HYDRATES, LIQUEFIED GASES, MAGNETIC MOMENTS, MAGNETIC PROPERTIES, NUCLEAR SPINS, QUADRUPOLE MOMENT, TEMPERATURE.

Distribution Statement : APPROVED FOR PUBLIC RELEASE