Isentropic compression of quartz by the pressure of a superstrong magnetic field
Pavlovskii A.I., Kolokol'chikov N.P., Dolotenko M.I., Bykov A.I.
The isentropic compressibility of crystalline quartz was plotted up to —1.5 Mbar, and it can be concluded from the curve that quartz undergoes a phase transition into a high-density modification at a pressure 1.25 ±0.15 Mbar.