Phase transitions and domain structures in ester and acid monolayers

2007 ◽  
pp. 197-201 ◽  
Author(s):  
X. Qiu ◽  
J. Ruiz-Garcia ◽  
C. M. Knobler
Keyword(s):  
Phase Transitions ◽  
Domain Structures

Ferroelastic phase transitions and domain structures in powders

2005 ◽  
Vol 220 (8) ◽  
Author(s):  
Hans Boysen
Keyword(s):  
Phase Transitions ◽  
Domain Walls ◽  
Approximate Model ◽  
Second Phase ◽  
High Symmetry ◽  
Line Profiles ◽  
Line Broadening ◽  
Rietveld Refinements ◽  
Domain Structures ◽  
Individual Line

AbstractPowder patterns of samples resulting from ferroelastic phase transitions generally show typical line profiles: asymmetry into the direction of the position of the corresponding hypothetical high symmetry reflection and strongly anisotropic line broadening. An approximate model is presented that describes the characteristic distribution of individual line widths based on the variation of lattice spacings within the domain walls. The variation with temperature is governed by the competition of decreasing spontaneous strain and increasing wall widths and/or wall densities. It is argued that conventional Rietveld refinements can easily lead to erroneous results and a simplified method is proposed to approximate the actual line profiles via the introduction of a second phase with anisotropic strain broadening to take into account the scattering fom the domain walls.

Growth of KNbO3 Crystal by a Pulling down Method

2011 ◽  
Vol 284-286 ◽  
pp. 2307-2310
Author(s):  
Min Jin ◽  
Hui Shen ◽  
Jia Yue Xu
Keyword(s):  
Phase Transitions ◽  
Room Temperature ◽  
Cone Angle ◽  
Xrd Analysis ◽  
Complex Domain ◽  
Blue Color ◽  
Domain Structures

In the present work, a pulling down method was introduced to prepare the KNbO3 crystals and the growth results were evaluated. It was found the Pt crucible with 60° cone angle and folds at the seed well was helpful to obtain KNbO3 crystal with nice integrity. The blue color occurred on the top of KNbO3 ingot was confirmed to be orthorhombic KNbO3 by XRD analysis. Some complex domain structures, including 60°, 90° and 180° domains, were happened in the crystal which were attributed to phase transitions when it was cooled down to room temperature.

Domain structures and phase transitions of PMNT single crystals

2005 ◽  
Vol 275 (1-2) ◽  
pp. e1703-e1706 ◽  
Author(s):  
X.B. Hu ◽  
J.Y. Wang ◽  
L.L. Ma ◽  
X.G. Xu ◽  
H.S. Luo ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Single Crystals ◽  
Domain Structures

Irreversible Thermodynamic Description of Domain Occurrences in Ferroics

2012 ◽  
Vol 560-561 ◽  
pp. 140-144
Author(s):  
Yuan Zhen Cai
Keyword(s):  
Phase Transitions ◽  
Entropy Production ◽  
Stationary State ◽  
Thermodynamic Description ◽  
Irreversible Thermodynamic ◽  
Irreversible Thermodynamics ◽  
Minimum Entropy ◽  
Spatial Symmetry ◽  
Domain Structures ◽  
Minimum Entropy Production

Based on the irreversible thermodynamics, a irreversible thermodynamic description of domain occurrences in ferroics such as ferroelectrics, ferromagnetics and ferroelastics was given. The ferroic domain structures occur at the ferroic phase transitions from the prototype phases to the ferroic phases. The processes of transition are stationary state processes so that the principle of minimum entropy production is satisfied. The domain occurrences are a consequence of this principle. The time-spatial symmetry related to the domains and their occurrences was also expounded.

Domain structures at ferridistortive phase transitions in [N(CH3)4]2ZnBr4and related crystals

1993 ◽  
Vol 140 (1) ◽  
pp. 245-252 ◽  
Author(s):  
Akikatsu Sawada ◽  
Hiroshi Matsumoto ◽  
Keisuke Tanaka
Keyword(s):  
Phase Transitions ◽  
Domain Structures

A phase-field model of phase transitions and domain structures of NiCoMnIn metamagnetic alloys

2015 ◽  
Vol 83 ◽  
pp. 333-340 ◽  
Author(s):  
H.B. Huang ◽  
X.Q. Ma ◽  
J.J. Wang ◽  
Z.H. Liu ◽  
W.Q. He ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Domain Structures
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