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Lithium ammonium sulphate (LAS) undergoes a phase transition at T C1 =459.5K from a paraelectric phase (phase I) to a ferroelectric phase (phase II) and again at T C2 =283K to a polar ferroelastic phase (phase III). Proton spin lattice relaxation time measured at 10 MHz in powdered LAS in the temperature range 480 to 77K shows discontinuous changes at the two transitions.
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Shenoy et al. (1980) studied this question.
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