Radiation-Induced Phase Transition of Quartz

Raman opalescence of a destabilizing soft mode near the phase transition in quartz monocrystals

“…It is preferable to synthesize crystals with a low temperature of phase transitions close to room temperature. As shown in previous studies, the phase transition temperature in quartz‐like structures may be reduced, for example, under neutron irradiation. Observation of Raman opalescence at room temperature will open new opportunities in fundamental and applied physics.…”

“…In Scott and Porto, thorough information on whole Raman spectra of this crystal has been obtained. Peculiarities near the phase transition point were studied in previous studies . Data on Raman line frequencies and half‐widths at various temperatures are presented in previous works .…”

“…Quartz crystals were extensively studied by means of Raman spectroscopy . First results concerning temperature dependence of Raman spectra in crystalline quartz were obtained in Landsberg and Mandelstam .…”

“…Quartz crystals were extensively studied by means of Raman spectroscopy. [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] First results concerning temperature dependence of Raman spectra in crystalline quartz were obtained in Landsberg and Mandelstam. [19] This early study showed that at a temperature increase, the line near 466 cm -1 broadens without significant frequency shift and is observed above the α-β phase transition point.…”

“…Peculiarities near the phase transition point were studied in previous studies. [21][22][23][24][25][26][27][28][29] Data on Raman line frequencies and half-widths at various temperatures are presented in previous works. [21][22][23][24] Scott [22] demonstrates that the low-intensity Raman peak at 147 cm -1 at room temperature, corresponding to the x (zz)y scattering geometry, strongly shifts in frequency towards the excitation line as the crystal temperature increases.…”