Kothari, D. S.
(1932)
*On the possibility of a thermal effect accompanying sudden changes in the magneton-numbers in CuCl _{2} and NiSO_{4}7 H_{2}O*
Mathematical Proceedings of the Cambridge Philosophical Society, 28
(3).
pp. 338-340.
ISSN 0305-0041

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Official URL: http://journals.cambridge.org/abstract_S0305004100...

Related URL: http://dx.doi.org/10.1017/S0305004100010197

## Abstract

1. The temperature variation of the paramagnetic susceptibility of most of the solids follows the generalised Curie law ψ = C/ T ∓ θ' 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 p = 14.07 √C_{M} where C_{M} 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.

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ID Code: | 32487 |

Deposited On: | 30 Mar 2011 11:15 |

Last Modified: | 09 Jun 2011 08:30 |

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