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The tetragonality of BCT gamma manganese is investigated by calculating the volume conserving axial pressure. This pressure is obtained using the energy bands and wavefunctions of a bandstructure calculation for gamma manganese. The bandstructure and the resulting pressure indicate that, for this structure, gamma manganese is tetragonal with c/a<1. This result is compared with experiment and a new spin structure is proposed for the observed c/a>1 tetragonal phase of manganese-nickel alloys with high nickel content.
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N.A. Cade (1981) studied this question.
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