Raman Spectra of Lattice Vibrations and the Order-Disorder Phase Transition in Ammonium Halides

1969 ◽  
pp. 665-674 ◽  
Author(s):  
L. Rimai ◽  
T. Cole ◽  
J. Parsons
Keyword(s):  
Phase Transition ◽  
Raman Spectra ◽  
Lattice Vibrations ◽  
Disorder Phase Transition ◽  
Ammonium Halides

scholarly journals Raman scattering and neutron-diffraction studies of fresh ice and Antarctic ice

2000 ◽  
Vol 31 ◽  
pp. 247-251 ◽  
Author(s):  
Hiroshi Fukazawa ◽  
Shinji Mae ◽  
Susumu Ikeda
Keyword(s):  
Phase Transition ◽  
Neutron Diffraction ◽  
Raman Spectra ◽  
Ice Sheets ◽  
Neutron Powder Diffraction ◽  
Lattice Vibrations ◽  
Polar Ice ◽  
Discontinuous Change ◽  
Measurement Temperature ◽  
Polar Ice Sheets

AbstractIn order to investigate the temperature dependence of vibrational spectra of ice, we measured the Raman spectra of artificial ice Ih in the temperature range 198–270 K. The frequency of translational lattice vibrations decreases with increases in the measurement temperature, and the rate of decrease discontinuously changes at 237 K. The discontinuous change of the rate of decrease is consistent with the phase transition from a proton-disordered arrangement to a proton-ordered arrangement at the ice temperature Ti = 237 K in polar ice sheets, as proposed by Fukazawa and others (1998b). We then compared the Raman spectra of translational lattice vibrations in ice Ih and Antarctic ice and examined the possible effects of the phase transition on the geophysical properties of Antarctic ice. We also report preliminary results of the neutron powder diffraction of Dome Fuji (DF) Antarctic ice, and discuss arrangements of protons in DF ice.

Single Crystal Raman Spectra of the Phase Transition in KTCNQ

1982 ◽  
Vol 85 (1) ◽  
pp. 297-303 ◽  
Author(s):  
A. D. Bandrauk ◽  
K. D. Truong ◽  
S. Jandl
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Raman Spectra

ORDER-DISORDER PHASE TRANSITION OF Au(110)-(1x2) RECONSTRUCTION

1988 ◽  
Vol 49 (C6) ◽  
pp. C6-269-C6-273 ◽  
Author(s):  
H. Q. NGUYEN ◽  
Y. KUK ◽  
P. J. SILVERMAN
Keyword(s):  
Phase Transition ◽  
Disorder Phase Transition

A priori study of the order-disorder phase transition in NaNO2

1993 ◽  
Vol 87 (12) ◽  
pp. 1151-1154 ◽  
Author(s):  
H.M. Lu ◽  
R. Qi ◽  
J.R. Hardy
Keyword(s):  
Phase Transition ◽  
A Priori ◽  
Disorder Phase Transition

Order-Disorder Phase Transition in TEA+(TCNQ)2-

1983 ◽  
Vol 120 (2) ◽  
pp. 547-554 ◽  
Author(s):  
A. Brau ◽  
J. P. Farges ◽  
A. Filhol ◽  
H. Grassi
Keyword(s):  
Phase Transition ◽  
Disorder Phase Transition

Temperature-triggered order–disorder phase transition in molecular-ionic material N-butyldiethanolammonium picrate monohydrate

RSC Advances ◽  
2016 ◽  
Vol 6 (73) ◽  
pp. 69546-69550 ◽  
Author(s):  
Tariq Khan ◽  
Muhammad Adnan Asghar ◽  
Zhihua Sun ◽  
Chengmin Ji ◽  
Lina Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Dielectric Materials ◽  
Disorder Phase Transition ◽  
First Order ◽  
Oxygen Atoms

We report an organic–ionic material that undergoes a first-order structural phase transition, induced by order–disorder of oxygen atoms in picrate anion. This strategy offers a potential pathway to explore new switchable dielectric materials.

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