Applications Of Crystalline-amorphous Phase Transitions In Silicon Carbide

2005 ◽  
Author(s):  
C. Wagner ◽  
G. Krotz ◽  
H. Sonntag ◽  
H. Muller ◽  
G. Midler ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Phase Transitions ◽  
Amorphous Phase

Correlation of Structure with Crystalline to Amorphous Phase Transitions of 1,3,6-Substituted Fulvene-Derived Molecular Glasses

2020 ◽  
Vol 85 (17) ◽  
pp. 11116-11123
Author(s):  
Loren C. Brown ◽  
Andrew J. Peloquin ◽  
Nicholas P. Godman ◽  
Gary J. Balaich ◽  
Scott T. Iacono
Keyword(s):  
Phase Transitions ◽  
Amorphous Phase ◽  
Molecular Glasses

Two Species/Nonideal Solution Model for Amorphous/Amorphous Phase Transitions

1996 ◽  
Vol 455 ◽  
Author(s):  
Cornelius T. Moynihan
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Critical Temperature ◽  
Amorphous Phase ◽  
Thermodynamic Model ◽  
Critical Pressure ◽  
Solution Model ◽  
Amorphous Phases ◽  
First Order ◽  
Temperature And Pressure

ABSTRACTA simple macroscopic thermodynamic model for first order transitions between two amorphous phases in a one component liquid is reviewed, augmented and evaluated. The model presumes the existence in the liquid of two species, whose concentrations are temperature and pressure dependent and which form a solution with large, positive deviations from ideality. Application of the model to recent data indicates that water can undergo an amorphous/amorphous phase transition below a critical temperature Tc of 217K and above a critical pressure Pc of 380 atm.

High-density amorphous phase of silicon carbide obtained under large plastic shear and high pressure

2012 ◽  
Vol 85 (5) ◽  
Author(s):  
Valery I. Levitas ◽  
Yanzhang Ma ◽  
Emre Selvi ◽  
Jianzhe Wu ◽  
John A. Patten
Keyword(s):  
Silicon Carbide ◽  
High Pressure ◽  
Amorphous Phase ◽  
High Density ◽  
Plastic Shear

Tem Study of Crystallization of a-SiC in Contact With Silver

1995 ◽  
Vol 382 ◽  
Author(s):  
Nanchang Zh ◽  
Robert Sinclair
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Silicon Carbide ◽  
Amorphous Phase ◽  
Eutectic Phase ◽  
Crystalline Compound ◽  
Transmission Electron ◽  
Nucleation Sites ◽  
Form Compound ◽  
Silver Grains

ABSTRACTMetal mediated crystallization of an amorphous phase has been found in many systems, in which eutectic phase diagrams are formed. It is interesting to know if an amorphous phase containing two elements, which can form compound, can react and form a crystalline compound at a low temperature in contact with metals. In this paper we studied the Ag/Sil−xCx system by transmission electron microscopy(TEM). It was foundthat amorphous silicon carbide was crystallized into cubic SiC at about 800°C in areas containing Ag. The silver diffused and segregated into the a-SiC phase upon annealing. The silver grains in the original deposited layer as well as those segregated act as nucleation sites for the crystallization of β-SiC. A nucleation temperature as low as 800°C was observed.

Crystal structure of a 1,6-bis(phenylethynyl)pyrene-based cyclophane that exhibits mechanochromic luminescence

2021 ◽  
Author(s):  
Shohei Simizu ◽  
Shakkeeb Thazhathethil ◽  
Kiyonori Takahashi ◽  
Takayoshi Nakamura ◽  
Yoshimitsu Sagara
Keyword(s):  
Crystal Structure ◽  
Phase Transitions ◽  
Amorphous Phase ◽  
Photophysical Properties ◽  
Luminescent Materials ◽  
Mechanical Stimuli ◽  
Stimuli Responsive ◽  
Mechanochromic Luminescence

Cyclophanes featuring luminophores are considered promising candidates as thermal or mechanical stimuli-responsive luminescent materials. The mechanism of the changes in the photophysical properties on the crystal-crystal or crystal-amorphous phase transitions...

The Environment-Dependent Interatomic Potential Applied To Silicon Disordered Structures And Phase Transitions

1997 ◽  
Vol 491 ◽  
Author(s):  
Martin Z. Bazant ◽  
Efthimios Kaxiras ◽  
J. F. Justo
Keyword(s):  
Phase Transitions ◽  
Ab Initio ◽  
Amorphous Phase ◽  
Functional Form ◽  
Interatomic Potential ◽  
Amorphous Structure ◽  
Empirical Potential ◽  
Disordered Structures ◽  
Metallic Bonding ◽  
Environment Dependence

ABSTRACTThe recently developed Environment-Dependent Interatomic Potential (EDIP) holds the promise of a new degree of transferability in describing bulk phases and defects of elemental covalent solids with a simple theoretically motivated functional form. Here we explore to what extent the environment-dependence of the model can extrapolate successes of the fitted version for Si for bulk defects to disordered phases, which involve local configurations very different from those used in fitting. We find that EDIP-Si provides an improved description of the metallic bonding bond angles of the liquid and is the first empirical potential to predict a quench directly from the liquid to the amorphous phase. The resulting amorphous structure is in closer agreement with ab initio and experimental results than with any artificial prepration method. We also show that melting of the bulk crystal and premelting of the (100)2×1 surface are reasonably well described by EDIP-Si in spite of its not being fit to any such properties.

Sign in / Sign up

Export Citation Format

Share Document