Phase transitions and structural instability in HTSC compounds and related phases

1996 ◽  
Vol 46 (S3) ◽  
pp. 1417-1418 ◽  
Author(s):  
Svetlana G. Titova ◽  
Vladimir F. Balakirev ◽  
Pavel P. Pal-Val ◽  
Lidia N. Pal-Val ◽  
John T. S. Irvine
Keyword(s):  
Phase Transitions ◽  
Structural Instability

scholarly journals GEODYNAMICS

GEODYNAMICS ◽  
2011 ◽  
Vol 2(11)2011 (2(11)) ◽  
pp. 138-140
Author(s):  
H.H. Kuliyev ◽  
Keyword(s):  
Phase Transitions ◽  
Equilibrium State ◽  
Linear Theory ◽  
Structural Instability ◽  
Loss Of Stability ◽  
Geometric Form ◽  
Deformable Solid ◽  
The Earth ◽  
Internal Structures ◽  
Solid Bodies

The processes of consolidation, deconsolidation, phase transitions and destructions in the terms of internal structures of the Earth аre studied on the base of non-linear theory of deformable solid bodies. It is shown that the loss of stability of equilibrium state can precede to the processes of deconsolidation, phase transitions and destructions on geometric form change (structural instability).

Temperature-Driven Multiferroic Phase Transitions and Structural Instability Evolution in Lanthanum-Substituted Bismuth Ferrite

2019 ◽  
Vol 123 (7) ◽  
pp. 4457-4468 ◽  
Author(s):  
Jie Wei ◽  
Chunfang Wu ◽  
Tiantian Yang ◽  
Zhibin Lv ◽  
Zhuo Xu ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Bismuth Ferrite ◽  
Structural Instability

Characteristics of perovskite-related materials

1989 ◽  
Vol 328 (1599) ◽  
pp. 409-416 ◽  
Keyword(s):  
Phase Transitions ◽  
Perovskite Structure ◽  
Structural Phase ◽  
Structural Instability ◽  
Structural Phase Transitions ◽  
Kinetic Behaviour ◽  
Characteristic Features ◽  
Polaronic Transport ◽  
Structural Instabilities ◽  
Defect Densities

Oxides with perovskite structure show characteristic features of their physical behaviour that can be relevant for the understanding of the mantle m aterial (MgFe)SiO 3 . Perovskites distort locally, and four different mechanisms have been found: tilt of octahedral complexes, off-centring of the octahedrally coordinated cation, distortion of the octahedral cage and off-centring of the 12-fold coordinated site. These deformations usually lead to structural instabilities related to phase transitions, extremely sluggish kinetic behaviour even leading to pseudo-glasses and polaronic transport. All these properties depend sensitively on the oxygen fugacities, defect densities and the rheology of the system. There is some evidence that the predicted structural phase transitions and glass states occur in CaSiO 3 whereas no structural instability has yet been reported in MgSiO 3 .

Structural instability and poorly defined phase transitions in rare-earth dodecaborides RB12 (R=Ho-Lu) at intermediate temperatures

2020 ◽  
Vol 107 ◽  
pp. 106273
Author(s):  
O.N. Khrykina ◽  
A.P. Dudka ◽  
N.B. Bolotina ◽  
N.E. Sluchanko ◽  
N. Yu Shitsevalova
Keyword(s):  
Rare Earth ◽  
Phase Transitions ◽  
Structural Instability

Electron Microscopy of Graphite Intercalation Compounds

1982 ◽  
Vol 40 ◽  
pp. 544-545
Author(s):  
G. Timp ◽  
L. Salamanca-Riba ◽  
L.W. Hobbs ◽  
G. Dresselhaus ◽  
M.S. Dresselhaus
Keyword(s):  
Electron Microscopy ◽  
Phase Transitions ◽  
Domain Wall ◽  
Intercalation Compounds ◽  
Lattice Plane ◽  
Wall Model ◽  
Graphite Intercalation Compounds ◽  
Fundamental Symmetry ◽  
Graphite Intercalation

Electron microscopy can be used to study structures and phase transitions occurring in graphite intercalations compounds. The fundamental symmetry in graphite intercalation compounds is the staging periodicity whereby each intercalate layer is separated by n graphite layers, n denoting the stage index. The currently accepted model for intercalation proposed by Herold and Daumas assumes that the sample contains equal amounts of intercalant between any two graphite layers and staged regions are confined to domains. Specifically, in a stage 2 compound, the Herold-Daumas domain wall model predicts a pleated lattice plane structure.

Multiple phase transitions investigated by high-speed TEM

1990 ◽  
Vol 48 (4) ◽  
pp. 550-551
Author(s):  
Oleg Bostanjoglo ◽  
Peter Thomsen-Schmidt
Keyword(s):  
Phase Transitions ◽  
High Speed ◽  
Short Exposure ◽  
Semiconductor Film ◽  
Time Resolved ◽  
Short Exposure Time ◽  
Multiple Phase ◽  
Model Substance ◽  
History Of ◽  
Electron Image

Thin GexTe1-x (x = 0.15-0.8) were studied as a model substance of a composite semiconductor film, in addition being of interest for optical storage material. Two complementary modes of time-resolved TEM were used to trace the phase transitions, induced by an attached Q-switched (50 ns FWHM) and frequency doubled (532 nm) Nd:YAG laser. The laser radiation was focused onto the specimen within the TEM to a 20 μm spot (FWHM). Discrete intermediate states were visualized by short-exposure time doubleframe imaging /1,2/. The full history of a transformation was gained by tracking the electron image intensity with photomultiplier and storage oscilloscopes (space/time resolution 100 nm/3 ns) /3/. In order to avoid radiation damage by the probing electron beam to detector and specimen, the beam is pulsed in this continuous mode of time-resolved TEM,too.Short events ( <2 μs) are followed by illuminating with an extended single electron pulse (fig. 1c)

Evolution of Phase Transitions

2006 ◽  
Author(s):  
Rohan Abeyaratne ◽  
James K. Knowles
Keyword(s):  
Phase Transitions

Phase Transitions in Machine Learning

2009 ◽  
Author(s):  
Lorenza Saitta ◽  
Attilio Giordana ◽  
Antoine Cornuejols
Keyword(s):  
Machine Learning ◽  
Phase Transitions
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