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A Landau theory of the smectic B-E transition at constant volume is proposed. The coupling constants of this theory are then derived from a previously published microscopic theory. Coupling between the orientational order and the lattice-strain tensor is then introduced, and it is shown that this causes the B-E transition to be first order. Elastic neutron scattering is discussed as an experimental test of the microscopic theory. Finally, interlayer interactions are included.
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R. J. Meyer (1976) studied this question.
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