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A method for the measurement of optical birefringence at the phase transitions of materials exhibiting domain structures is described. Moreover, the order parameter for the order-disorder-transition between phase III and II of NH 4 Br is derived from measuring the optical birefringence. The hysteresis of the phase transition in ND 4 Br and the phenomena accompanying the transition to phase IV in NH 4 Br are also investigated.

Verlauf der Doppelbrechung bei den Phasenübergängen II–III und III–IV von NH 4 Br und ND 4 Br*