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On the possibility of a thermal effect accompanying sudden changes in the magneton-numbers in CuCl2 and NiSO47 H2O

Published online by Cambridge University Press:  24 October 2008

D. S. Kothari
D. S. Kothari
Affiliation:
Clare College
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Extract

1. The temperature variation of the paramagnetic susceptibility of most of the solids follows the generalised Curie law

as found first by Kamerlingh Onnes and Weiss. This gives a linear relation between 1/ψ and T. The value of C is a measure of the atomic magnetic moment, and if this moment is expressed in terms of the Weiss magneton-number p, then

where CM is the value of C when ψ refers to a gram-molecule. The experimental results for a paramagnetic substance are usually expressed in terms of p and θ. Weiss (1), Foex (2), Cabrera and others have found that in some substances there are discontinuities in the slope of the 1/ψ, T curve. Thus Weiss (3) finds that magnetite above its Curie point shows several sudden changes in the 1/ψ, T curve, which he has interpreted as corresponding to the magneton-numbers p = 4, 5, 6, 8,10. Similarly, for cupric chloride (anhydride) Weiss (4) gives p= 9.2 and 10, for the temperature ranges — 140° to 20° and 20° to 500° respectively. Nickel sulphate (5) has also been found to possess a transition point at about — 113°, where the p value on cooling changes from 14.6 to 18.2.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 28 , Issue 3 , July 1932 , pp. 338 - 340
Copyright
Copyright © Cambridge Philosophical Society 1932

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References

REFERENCES

(1)Weiss, , Jour. de Phys., 5, p. 147 (1924).Google Scholar
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(8)A Dictionary of Applied Physics, ii, “Potentiometer”.Google Scholar