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By P. W. Selwood

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47 L O W - A N D H I G H - F I E L D METHODS particles in a sample. 4) F r o m E q . 4) it is obviously necessary to obtain Ma before ν m a y b e calculated. Figure 14 shows h o w important it is to use high field and l o w temperature t o estimate M 8 with any degree of accuracy o n samples of this kind. Measurements are, therefore, first made on the sample at the boiling point of helium or, preferably, even lower. A plot of magnetization (or of galvanometer deflection) versus reciprocal field will then give a value corresponding t o Ma.

A n application of this m e t h o d t o a system of interest in heterogeneous 21 catalysis, R a n e y nickel, was made b y W e i l . ) T h e procedure used was the Weiss extraction m e t h o d with measurement of the decay rate of the remanent magnetization M r after removal of the sample from the field. Then, from tables of critical decay rates (see p . 21) and measurements at various temperatures, it is possible t o construct a particle size distribution curve for the sample as shown in Fig. 19.

4) it is obviously necessary to obtain Ma before ν m a y b e calculated. Figure 14 shows h o w important it is to use high field and l o w temperature t o estimate M 8 with any degree of accuracy o n samples of this kind. Measurements are, therefore, first made on the sample at the boiling point of helium or, preferably, even lower. A plot of magnetization (or of galvanometer deflection) versus reciprocal field will then give a value corresponding t o Ma. Thus, in Fig. 6 (in arbitrary units). T h e sample is then warmed to conditions under which true superparamagnetism is exhibited as evidenced b y M versus H/T superposition.

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