Table 1: Values of the critical exponent for the order parameter (Bragg intensity) and amplitude within the temperature intervals indicated for the , and incommensurate phases of quartz.

ProcessPhasesTemperature interval (K)  n/s·K2βFigure no.

HeatingINC845.57 < < 847−0.3513974 Figure 1
HeatingINC843.95 < < 845.3−0.0711003Figure 2
Heating847.23 < < 847.62−0.538349Figure 3
Cooling847.31 < < 848.18−0.274895Figure 4
CoolingINC845.88 < < 846.68−0.2910732Figure 5
Cooling843.61 < < 843.951.3290219Figure 6
Cooling844.5 < < 845.10.6226903Figure 7