Femtosecond time-resolved spectroscopy of soft modes in structural phase transitions of perovskites

1994 ◽  
Vol 50 (13) ◽  
pp. 8996-9019 ◽  
Author(s):  
Thomas P. Dougherty ◽  
Gary P. Wiederrecht ◽  
Keith A. Nelson ◽  
Mark H. Garrett ◽  
Hans P. Jenssen ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Soft Modes

scholarly journals Фазовая диаграмма и особенности поведения мягких мод в твердых растворах со структурой хантита TbFe-=SUB=-3-x-=/SUB=-Ga-=SUB=-x-=/SUB=-(BO_3)-=SUB=-4-=/SUB=-

2022 ◽  
Vol 130 (1) ◽  
pp. 84
Author(s):  
А.С. Крылов ◽  
А.Н. Втюрин ◽  
И.А. Гудим ◽  
И.В. Немцев ◽  
С.Н. Крылова
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Raman Spectra ◽  
Solid Solutions ◽  
Structural Phase ◽  
Temperature Phase ◽  
Structural Phase Transitions ◽  
Soft Modes ◽  
Temperature Phase Diagram

The Raman spectra of four crystals of TbFe3-хGax (BO3) 4 solid solutions (x from 0 to 0.54) were studied in the temperature range from 8 to 350 K. The temperatures of structural phase transitions were determined. The observed spectral behavior is characteristic to condensation and restoration of soft modes. Soft modes are associated with a structural phase transition from the R32 phase to the P3121 phase. The Compositions-Temperature phase diagram was constructed

PROBING PHOTOINDUCED STRUCTURAL PHASE TRANSITIONS BY FAST OR ULTRA-FAST TIME-RESOLVED X-RAY DIFFRACTION

2004 ◽  
pp. 309-342 ◽  
Author(s):  
Hervé Cailleau ◽  
Eric Collet ◽  
Marylise Buron-Le Cointe ◽  
Marie-Hélène Lemée-Cailleau ◽  
Shin-ya Koshihara
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Fast Time ◽  
Structural Phase Transitions ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray

Brillouin scattering spectroscopy of ferroelectric and ferroelastic phase transitions

1979 ◽  
Vol 293 (1402) ◽  
pp. 393-405 ◽  
Keyword(s):  
Phase Transitions ◽  
Light Scattering ◽  
Brillouin Scattering ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Temperature Dependent ◽  
The Past ◽  
Soft Modes ◽  
Light Scattering Spectroscopy ◽  
Level Of Understanding

Light scattering spectroscopy has played a crucial role in the study of numerous phase transitions and critical phenomena. In the case of structural phase transitions in crystalline solids, high resolution Raman and Brillouin scattering experiments have provided detailed information on the ‘soft modes’, the highly temperature-dependent lattice vibrations whose frequencies fall towards zero at the transition temperature. The condensation of the soft modes precipitates the spontaneous symmetry breaking which inevitably accompanies these transitions. Ferroelectrics comprise a particular class of crystals exhibiting structural phase transitions which have been investigated extensively by light scattering techniques. In addition to numerous soft mode studies, other subtle aspects of these transitions have been investigated by light scattering, including mode interactions and central peaks. In this presentation, the fundamental aspects of structural phase transitions and their relation to light scattering will be reviewed. A number of light scattering studies of ferroelectric crystals spanning the past decade will be summarized and used to illustrate the current level of understanding of these phenomena.

Surface vibrations, soft modes, and structural phase transitions of (001) slabs ofKMnF3andKZnF3

1989 ◽  
Vol 39 (11) ◽  
pp. 7938-7948 ◽  
Author(s):  
R. Reiger ◽  
J. Prade ◽  
U. Schröder ◽  
F. W. de Wette ◽  
A. D. Kulkarni ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Soft Modes ◽  
Surface Vibrations
Sign in / Sign up

Export Citation Format

Share Document