Raman scattering near the structural phase transition of As2O5: order parameter treatment

1986 ◽  
Vol 19 (23) ◽  
pp. 4537-4545 ◽  
Author(s):  
U Bismayer ◽  
E Salje ◽  
M Jansen ◽  
S Dreher
Keyword(s):  
Phase Transition ◽  
Raman Scattering ◽  
Structural Phase Transition ◽  
Order Parameter ◽  
Structural Phase

scholarly journals Pressure-induced structural phase transition in CaCrO4: Evidence from Raman scattering studies

2005 ◽  
Vol 87 (18) ◽  
pp. 181901 ◽  
Author(s):  
Y. W. Long ◽  
W. W. Zhang ◽  
L. X. Yang ◽  
Y. Yu ◽  
R. C. Yu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Raman Scattering ◽  
Structural Phase Transition ◽  
Structural Phase

Generalized susceptibility of dislocations in ferroelectrics and ferromagnetics

1990 ◽  
Vol 193 (3-4) ◽  
Author(s):  
V. V. Dezhin ◽  
V. N. Nechaev ◽  
A. M. Roshchupkin
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Order Parameter ◽  
Transition Point ◽  
Natural Frequencies ◽  
Structural Phase ◽  
Phase Transition Point

AbstractA generalized susceptibility of dislocations is calculated in ferroelectrics and ferromagnetics and also in the vicinity of a structural phase transition point by which natural frequencies for dislocations are defined, when the fariation of the order parameter

scholarly journals Manifestation of magnetoelastic interactions in Raman spectra of HoxNd1−xFe3(BO3)4 crystals

2018 ◽  
Vol 08 (02) ◽  
pp. 1850011 ◽  
Author(s):  
A. S. Krylov ◽  
S. N. Sofronova ◽  
I. A. Gudim ◽  
S. N. Krylova ◽  
Rajesh Kumar ◽  
...  
Keyword(s):  
Phase Transition ◽  
Raman Spectra ◽  
Structural Phase Transition ◽  
Solid Solutions ◽  
Order Parameter ◽  
Soft Mode ◽  
Magnetic Phase ◽  
Structural Phase ◽  
Exchange Interactions ◽  
Magnetoelastic Interaction

Raman spectra of Ho[Formula: see text]NdxFe(BO3)4 ([Formula: see text], 0.75, 0.5, 0.25) have been studied in temperature range 10–400[Formula: see text]K. Two compositions ([Formula: see text], [Formula: see text]) demonstrate structural phase transition with soft mode restoration. The addition of Nd atoms increases interatomic spacing and decreases the temperature of structural phase transition. The solid solutions ([Formula: see text], 0.5, 0.25) demonstrate the emergence of the peaks corresponding to magnetoelastic interaction below Néel temperature. The order parameter of the magnetic phase transition has been determined. The equal concentrations of holmium and neodymium atoms prevent magnon soft modes condensation caused by exchange interactions in Fe–O–Fe chains are observed. Calculations confirm the data obtained in the experiment.

Pressure-induced structural phase transition of CdS microcrystals studied by raman scattering

1995 ◽  
Vol 56 (3-4) ◽  
pp. 491-494 ◽  
Author(s):  
Toshihiro Arai ◽  
Toshiharu Makino ◽  
Masaaki Arai ◽  
Kiyoto Matsuishi ◽  
Seinosuke Onari
Keyword(s):  
Phase Transition ◽  
Raman Scattering ◽  
Structural Phase Transition ◽  
Structural Phase

Pressure-induced structural phase transition in Na0.5Bi4.5Ti4O15 by Raman scattering

1996 ◽  
Vol 218 (1-2) ◽  
pp. 94-98 ◽  
Author(s):  
Jianjun Liu ◽  
Chunxiao Gao ◽  
Guangtian Zou ◽  
Yanrong Jin
Keyword(s):  
Phase Transition ◽  
Raman Scattering ◽  
Structural Phase Transition ◽  
Structural Phase

A structural phase transition in NaTaOGeO4 and its relation to phase transitions in titanite

2007 ◽  
Vol 63 (4) ◽  
pp. 545-550 ◽  
Author(s):  
Thomas Malcherek
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Transition Metal ◽  
Structural Phase Transition ◽  
Order Parameter ◽  
Diffuse Scattering ◽  
Structural Phase ◽  
Group Symmetry ◽  
Critical Temperatures ◽  
Symmetry Properties

A structural phase transition from space-group symmetry P21/c to C2/c is reported for NaTaOGeO4 (NTGO). The critical temperature has been located at T c = 116 K, based on the appearance of sharp diffraction maxima at positions h + k = 2n + 1 of reciprocal space on cooling below this temperature. Strongly anisotropic diffuse scattering in sheets normal to [001] is observable for T > T c and persists up to ambient temperature. Similarities to phase transitions observed in other compounds of the titanite structure type are discussed. The symmetry properties of these phase transitions are reassessed on the basis of the structural data available. The primary order parameter is identified with the displacement of the transition metal cation M (M = Ta in NTGO) away from the centre of symmetry that it nominally occupies in the paraphase. The order parameter transforms as the Y_{2}^{-} representation. The anisotropic diffuse scattering is attributed to the one-dimensional correlation of local M displacements parallel to the direction of chains of trans-corner-sharing MO6 octahedra. The critical temperatures of the isomorphous phase transitions in various titanite-type compounds depend linearly on the squared transition-metal displacement measured in the ordered P21/c phase.

Study of structural phase transition in NH4SCN from Raman scattering

1984 ◽  
Vol 103 (4) ◽  
pp. 328-331 ◽  
Author(s):  
G.D. Tewari ◽  
G.S. Raghuvanshi ◽  
D.P. Khandelwal ◽  
H.D. Bist
Keyword(s):  
Phase Transition ◽  
Raman Scattering ◽  
Structural Phase Transition ◽  
Structural Phase
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