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A magnetic balance for the measurement of the saturation magnetization of alloys has been designed and built. The magnet develops a field strength of 21,000 oersteds in a gap approximately seven-eighths inch long and two inches in diameter, when consuming a power of 4.5 kilowatts. This field is sufficient to saturate solid metal samples of random shape. Specially shaped pole caps are used which produce a gradient in the direction of the axis of the gap which is constant to within two percent, within a volume cube three-sixteenths of an inch on edge. The ratio of saturation magnetizations of iron and nickel at room temperature agree closely with the accepted values. A new magnetic phase has been discovered in the manganese carbon system. It has been identified as ferromagnetic, but its composition and crystal structure remain unknown. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

The investigation of ferromagnetic phases in the manganese indium, manganese antimony carbon and the manganese magnesium alloy systems was conducted mainly by means of x-ray diffraction methods and where ever permissible by metal1ographic examination. The manganese indium and the manganese antimony carbon alloys were prepared in the vacuum melting furnace in an argon atmosphere, while the manganese magnesium alloys were prepared by sinter-compact techniques. Heat treatments were carried out in tube furnaces in an argon atmosphere. Ferromagnetic phases were not found in either the manganese indium or the manganese magnesium systems. The presence of the compound Mn₃In in the manganese indium system was established. The compound has a gamma brass structure with a lattice parameter a₀ = 9.413 A°. In the manganese magnesium system only solid solutions of manganese and magnesium were found to exist. The manganese solid solution was not magnetic suggesting that the addition of magnesium atoms did not give the degree of separation of manganese atoms for favourable ferromagnetic conditions. It was concluded also that the manganese atoms in the compound Mn₃In were not sufficiently separated for favourable ferromagnetic conditions. The ferromagnetic phase found in the manganese antimony carbon alloys was attributed to the compound Mn₂Sb. This suggested that elements in Group Vb which are strongly electronegative to manganese and form stable binary compounds, do not tend to form ternary compounds containing carbon. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate

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Thesis (M.S.)--University of Wisconsin--Madison, 1968. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

An investigation of ferromagnetism in nickel manganese alloys up to forty atomic percent manganese has been carried out. Twenty alloys within this composition range were subjected to three heat treatments such that the conditions within the alloys varied from atomic disorder to a high degree of long range order. The degree of order of Ni₃Mn calculated from measured saturation magnetisation using the Ising model of ferromagnetism was consistent with the value calculated from the ratio of measured integrated intensity of the (110) x-ray diffraction superlattice line to that of line (111). The relationship between saturation magnetisation and concentration for the disordered alloys can be explained adequately by the existence of short range order. A value of 3.4 Bohr magnetons was obtained for the effective magnetic moment of manganese atoms in a nickel lattice. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

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published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy

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