Trends in negative pressure achieved over a few thousand cavitation events were observed for ethanol, benzene and xylene in a stainless steel Berthelot tube sealed with a pre-de-gassed Ni plug. When the system was repeatedly heated and then cooled alternately over a temperature range between 60 degrees C and 10 degrees C (temperature cycle), negative pressure increased steeply for earlier cycles and levelled off eventually as in a water-metal tube system. Owing to the cavitation history effect, negative pressures of around -200 bar, the highest ever attained for organic liquids in the Berthelot method, were generated at around 15 degrees C in a useful volume ( approximately 1 cm3). It has become feasible to measure thermodynamic properties of organic liquids under negative pressure, since the pressures were up to half of the homogeneous nucleation limits of cavitation.
By making use of the recently measured spin-wave dispersion relations we have calculated the spin-wave contributions to the low-temperature specific heats of antiferromagnetic MnF2, FeF2, CoFz and NiFz from 0 to 50 OK (0 to 35 OK for CoF2) using two different numerical methods. T h e results are compared with the experimental measurements of Stout and Catalano for temperatures of 1 5 OK and above; it is suggested that further experimental measurements below 15 'K would b e worth while.
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