THEORY OF RAYLEIGH AND BRILLOUIN SCATTERING NEAR THE PHASE TRANSITION

1972 ◽  
Vol 33 (C2) ◽  
pp. C2-11-C2-14 ◽  
Author(s):  
R. KLEIN
Keyword(s):  
Phase Transition ◽  
Brillouin Scattering

scholarly journals Brillouin scattering near the ferroelectric phase transition in TSCC

1985 ◽  
Vol 63 (1) ◽  
pp. 107-114
Author(s):  
Tomoyuki Hikita ◽  
Paul Schnackenberg ◽  
V. Hugo Schmidt
Keyword(s):  
Phase Transition ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Brillouin Scattering

Sound velocity of neon at high pressures and temperatures by Brillouin scattering

2019 ◽  
Vol 104 (11) ◽  
pp. 1650-1655
Author(s):  
Wei Wei ◽  
Xinyang Li ◽  
Ningyu Sun ◽  
Sergey N. Tkachev ◽  
Zhu Mao
Keyword(s):  
Phase Transition ◽  
High Pressures ◽  
Velocity Structure ◽  
Solid Phase ◽  
Brillouin Scattering ◽  
Compressional Wave ◽  
Rare Gases ◽  
Apparent Reduction ◽  
Diamond Anvil ◽  
Increasing Temperature

Abstract In this study, we have determined the combined effect of pressure and temperature on the compressional-wave velocity (VP) of Ne up to 53 GPa and 1100 K using Brillouin scattering in externally heated diamond-anvil cells. The phase transition from the supercritical fluid to solid phase was observed to cause a 10.5–11% jump in VP, and the magnitude in the VP contrast across the phase transition increases with temperature. In addition, we have observed an abnormal reduced increase rate of VP with pressure in the supercritical Ne fluid at both 800 and 1100 K before the transition to the solid phase. VP of the solid Ne exhibits a nonlinear increase with pressure at all the investigated temperatures. The elevating temperature was noted to cause an apparent reduction in VP, yet the reduction in VP caused by increasing temperature dramatically decreases at higher pressures. At 20 GPa, increasing temperature by 100 K can lower the VP of Ne by 2.4%. Yet elevating temperature by 100 K can only reduce the VP by 0.4% at 50 GPa. We further compare VP of Ne to that of other rare gases, including Ar, Kr, and Xe. At 300 K, VP of Ne shows a stronger dependence on pressure than both Kr and Xe. Moreover, increasing temperature can produce a greater reduction in VP of Ne than that of Ar below 50 GPa. Our measured VP of Ne is also useful for understanding the velocity structure of giant planets, such as Jupiter.

Brillouin-Scattering Evidence for a New Phase Transition in Perovskite Crystals: PrAlO3

1974 ◽  
Vol 33 (8) ◽  
pp. 492-495 ◽  
Author(s):  
P. A. Fleury ◽  
P. D. Lazay ◽  
L. G. Van Uitert
Keyword(s):  
Phase Transition ◽  
Brillouin Scattering ◽  
New Phase

Brillouin scattering in pure and γ-irradiated TGS crystals near the phase transition

1981 ◽  
Vol 39 (1) ◽  
pp. 1185-1188 ◽  
Author(s):  
V. A. Yurin ◽  
V. F. Kitaeva ◽  
V. A. Rivkin ◽  
I. S. Zheludev
Keyword(s):  
Phase Transition ◽  
Brillouin Scattering

Brillouin scattering of the order-disorder type phase transition in NaNO3

1996 ◽  
Vol 219-220 ◽  
pp. 596-598 ◽  
Author(s):  
S. Yoshida ◽  
Y. Tsujimi ◽  
T. Yagi
Keyword(s):  
Phase Transition ◽  
Brillouin Scattering ◽  
Type Phase ◽  
Disorder Type

Brillouin scattering near the α–β phase transitions of N2 and CO

1988 ◽  
Vol 66 (4) ◽  
pp. 541-548 ◽  
Author(s):  
V. Askarpour ◽  
H. Klefte ◽  
M. J. Clouter
Keyword(s):  
Phase Transition ◽  
Single Crystals ◽  
Elastic Constants ◽  
Brillouin Scattering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Β Phase ◽  
Α Phase ◽  
Mode Softening ◽  
Cubic Structure

The technique of high resolution Brillouin spectroscopy has been used to determine the adiabatic elastic constants of single crystals of β-N2 and β-CO as a function of temperature, in an effort to study the α–β phase transition. For all elastic constants, there is an increase of approximately 1%/K on cooling and there is no evidence of further mode softening, even within 0.5 K of the phase transition. Three large single crystals of α-CO were grown. The orientations were determined, by Laue X-ray diffraction, and correlated to the orientations of the parent β-crystals. The β-phase hexagonal basal planes appear to transform to planes of the form {110} in the α-phase cubic structure.

Sign in / Sign up

Export Citation Format

Share Document