“…Before the sample was heated to the experimental temperature by a special resistant heater the chamber inner volume has been vacuumized and filled with pure helium. The error of temperature measurements and temperature control was about ±5 K. The apparatus and measurement routines were reported in [22]. The experimental diffraction vector value (Q = 4π sin Q/λ, where θ is the half of the scattering angle) ranged from 9 to 125 nm -1 .…”