Low Temperature Specific Heat of Ni(NO3)2.6H2O; Antiferromagnetic Interactions.
Abstract
Measurements of the specific heat of nickel nitrate hexahydrate for 0.5 < T < 12K reveal a Schottky anomaly with Cp max=1.373 cal/mole-K at T(max)=2.35K. The experimental data are explained by the complete splitting of the S=1 ground state triplet, with levels separated successively by 4.80K and 3.26K. The lattice contribution is found to be 4.11 x 10 to the -4th power x (T cubed) cal/mole-K. The discrepancies between the level spacings as deduced from these measurements and from the reported powder susceptibility data are removed by taking into account a small antiferromagnetic exchange interaction (A/k = +0.6K) in a molecular field approximation. The total magnetic entropy change is found to be within 0.6% of the theoretically predicted value for a spin 1 system. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1971
- Accession Number
- AD0726429
Entities
People
- A. Herweijer
- S. A. Friedberg
Organizations
- Carnegie Mellon University