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  • The nature of ammonium ion disorder in ammonium tetrafluoroaluminate, NH4AlF4. 

    Reproduced from White, Mary Anne, and Brian D. Wagner. 1985. "The nature of ammonium ion disorder in ammonium tetrafluoroaluminate, NH4AlF4.." Journal of Chemical Physics 83(11): 5844-5848, with the permission of AIP Publishing.
    To clarify previous conflicting reports concerning the existence of an order-disorder phase transition in NH4AlF4 at T ?150 K, the heat capacity of this compd. was measured from T = 15 to 305 K, by adiabatic calorimetry. ...