Magnetic Moment, Magnetic Work, and Internal Energy of NiSiF6·6H2O in the Region 0.3°—4.2°K with Magnetic Fields 0–90 kG Parallel to the c Axis

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Abstract
Values of the magnetic moment of a 3.5‐cm‐diam spherical single crystal of NiSiF6·6H2O have been determined over the range 0.3°—4.25°K and 0–90 kG. The field was parallel to the c crystallographic axis. The observations have been used to give values of the isothermal differential magnetic susceptibility, and the isothermal work of magnetization. The data have been combined with our previous measurements of the heat capacity and entropy in magnetic fields to give values of the internal energy and heat content. The above properties will, with later observations. serve as a basis for extending the determination of the magnetothermodynamic properties of NiSiF6·6H2O into the region below 0.3°K. All of the data refer to a spherical crystal without correction for the demagnetizing effect since this is unnecessary and inconvenient in a thermodynamic treatment. This substance is very completely saturated at the available magnetic fields and temperatures. The saturation value, corrected for diamagnetism, was found to be 12547 G·cm3/mole, corresponding to a g=2.246. Observations of the saturation moment at fields of 60–90 kG indicate that there is no appreciable ``temperature‐independent'' paramagnetic component in the magnetic moment.