MAGNETIC SUSCEPTIBILITIES OF IRON GROUP SALTS AT LOW TEMPERATURES

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Abstract
A magnetic balance of the Sucksmith ring type has been constructed. It is capable of a precision of 0.5 to 1% in measurements of displacement. The estimated maximum error in susceptibility measurements is 2%. This apparatus has been used to measure the temperature variation of the susceptibilities of chromium sulphate, hydrated and anhydrous, and of the nitrates of chromium, cobalt, and nickel. Measurements were made at several values of the magnetic field strength, so that a correction for small amounts of ferromagnetic impurity could be obtained. The reciprocals of the corrected specific susceptibilities were plotted against the absolute temperature. The intercepts on the temperature axis of the resulting straight lines gave the values of the Curie–Weiss constant. These values have been compared with those for other salts of the same ions. The effective Bohr magneton numbers were calculated and compared with theoretical values given by van Vleck.

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