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By Pierce W. Selwood

ISBN-10: 1483231054

ISBN-13: 9781483231051

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48 III. 23 In 1954 the author proposed a method4 based on the assumption that the Curie temperature is a function of particle size. This assumption has since been shown to be wrong, or at least to be of minor significance in connection with the systems under investigation. A useful result which emerged from these several studies16 is that typical nickel-silica preparations begin to sinter, with growth of the nickel particles, if they are heated above about 400°C. 24-26 This method is based on the remanence shown by very small ferromagnetic particles at low temperature.

P. 394. Cornell Univ. Press, Ithaca, New York, 1960. CHAPTER III Very Small Ferromagnetic Particles 1. Introduction The presence of a single layer of adsorbed molecules on the surface of a metal could hardly be expected to cause a measurable change in the magnetization of the metal unless the sample of adsorbent had a large specific surface area. With available methods for measuring magnetizations it might be expected that such an effect could be observed if 1% of the metal atoms were on the surface.

27. C. P. Bean, J. D. Livingston, and D. S. Rodbell, Acta Met. 5, 682 (1957). 28. D. P. Hollis and P. W. Selwood, J. Chem. Phys. 35, 378 (1961). 29. A. Knappwost and H. D. Stein, Z. Elektrochem. 64, 321 (1960) ; also C. J. Lin, J. Appl. Phys. 32, 233S (1961). 30. R. Haul and T. Schoon, Z. Elektrochem. 45, 663 (1939). CHAPTER IV The Measurement of Saturation Magnetization 1. The Experimental Problem A major purpose of this work is to improve our understanding of the binding forces operative between adsorbent and adsorbate.

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Adsorption and Collective Paramagnetism by Pierce W. Selwood

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