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Order-disorder phase transitions in NHBrCl crystals

The Journal of Chemical Physics, ISSN: 0021-9606, Vol: 71, Issue: 8, Page: 3158-3164
1979
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  • Citations
    39
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      39

Article Description

Single crystals of NHBrCl have been investigated ultrasonically over a wide range of pressure, temperature, and composition. Using the elastic constant c as a convenient probe, we have established the p-T-x phase diagram in the region where the orientations of NH ions undergo long-range ordering. Two critical surfaces exist: one corresponding to "ferro" ordering and one corresponding to "antiferro" ordering. These surfaces intersect in a line of triple points closely related to the bicritical points in magnetic spin-flop systems. The adiabatic elastic constants c and C′ (as well as the acoustic absorption associated with these waves) have also been measured along several isobaric paths. The results are consistent with the existence of a master p-T phase diagram valid for all values of x. © 1979 American Institute of Physics.

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