Lattice dynamics and phase transition of acetylene

1982 ◽  
Vol 76 (12) ◽  
pp. 6215-6220 ◽  
Author(s):  
Z. Gamba ◽  
H. Bonadeo
Keyword(s):  
Phase Transition ◽  
Lattice Dynamics

Lattice dynamics and phase transition in sodium azidea)

1977 ◽  
Vol 67 (1) ◽  
pp. 81-85 ◽  
Author(s):  
L. B. Kanney ◽  
N. S. Gillis ◽  
J. C. Raich
Keyword(s):  
Phase Transition ◽  
Lattice Dynamics

scholarly journals Optical properties, lattice dynamics, and structural phase transition in hexagonal2H−BaMnO3single crystals

2015 ◽  
Vol 92 (13) ◽  
Author(s):  
T. N. Stanislavchuk ◽  
A. P. Litvinchuk ◽  
Rongwei Hu ◽  
Young Hun Jeon ◽  
Sung Dae Ji ◽  
...  
Keyword(s):  
Phase Transition ◽  
Optical Properties ◽  
Structural Phase Transition ◽  
Lattice Dynamics ◽  
Structural Phase

LATTICE DYNAMICS OF THE CUBIC-TETRAGONAL PHASE TRANSITION IN KNb03

1981 ◽  
Vol 42 (C6) ◽  
pp. C6-749-C6-751 ◽  
Author(s):  
M. D. Fontana ◽  
G. E. Kugel ◽  
C. Carabatos
Keyword(s):  
Phase Transition ◽  
Tetragonal Phase ◽  
Lattice Dynamics ◽  
Tetragonal Phase Transition

Ultrafast lattice dynamics in FeRh during a laser-induced magnetic phase transition

2010 ◽  
Author(s):  
U. Shymanovich ◽  
W. Lu ◽  
M. Nicoul ◽  
A. Tarasevitch ◽  
D. von der Linde ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Lattice Dynamics ◽  
Magnetic Phase

scholarly journals Ferroelectric Phase Transition in Cu-doped BaTiO3 Crystals

2009 ◽  
Vol 1 (2) ◽  
pp. 192-199 ◽  
Author(s):  
A. Ouedraogo ◽  
K. Palm ◽  
G. Chanussot
Keyword(s):  
Phase Transition ◽  
Single Crystals ◽  
Lattice Dynamics ◽  
Paraelectric Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
Elastic Forces ◽  
First Order Phase ◽  
Concentration Of Impurities ◽  
Curie Temperature Tc

The paper examines the ferroelectric-paraelectric phase transition in Cu:BaTiO3 single crystals. Using thermo-currents and dielectric measurements, we found for pure samples the phase transition temperature to be close to Curie temperature (Tc=120°C) with an anisotropy of the dielectric constantε.The lowering of temperature Tm, corresponding to the maximum of pyroelectric signal, with the increase of concentration of impurities is confirmed by measurements of ε. Moreover, the e(T) curves show progressive broadening as well as higher peak with the increase of  impurity concentration, and the transition becomes more and more diffuse. The same effect occurs when the samples are subjected to a laser irradiation (λ=5145Ǻ). During annealing, crystals lose copper and Tm is thereafter observed to increase again. BaTiO3 is a displacive ferroelectric (having high permittivity k-values) which undergoes a first order phase transition. Ions substitutions have an effect on the lattice dynamics attributed to charge transfer to Ti and a lowering of elastic forces in BaTiO3. Kewwords: Ferroelectric transition; BaTiO3 single crystals; Thermo-currents; Dielectric constant.  © 2009 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v1i2.1876  

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