Pressure-induced phase transitions of vaterite, a metastable phase of CaCO3

2017 ◽  
Vol 48 (11) ◽  
pp. 1449-1453 ◽  
Author(s):  
Koji Maruyama ◽  
Hiroyuki Kagi ◽  
Kazuki Komatsu ◽  
Toru Yoshino ◽  
Satoshi Nakano
Keyword(s):  
Phase Transitions ◽  
Metastable Phase

scholarly journals Fate of false vacua in holographic first-order phase transitions

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Francesco Bigazzi ◽  
Alessio Caddeo ◽  
Aldo L. Cotrone ◽  
Angel Paredes
Keyword(s):  
Phase Transitions ◽  
Chiral Symmetry ◽  
Metastable Phase ◽  
Chiral Symmetry Breaking ◽  
Model Parameters ◽  
Temperature Phase ◽  
Thin Wall ◽  
Critical Temperatures ◽  
First Order ◽  
First Order Phase

Abstract Using the holographic correspondence as a tool, we study the dynamics of first-order phase transitions in strongly coupled gauge theories at finite temperature. Considering an evolution from the large to the small temperature phase, we compute the nucleation rate of bubbles of true vacuum in the metastable phase. For this purpose, we find the relevant configurations (bounces) interpolating between the vacua and we compute the related effective actions. We start by revisiting the compact Randall-Sundrum model at high temperature. Using holographic renormalization, we compute the derivative term in the effective bounce action, that was missing in the literature. Then, we address the full problem within the top-down Witten-Sakai-Sugimoto model. It displays both a confinement/deconfinement and a chiral symmetry breaking/restoration phase transition which, depending on the model parameters, can happen at different critical temperatures. For the confinement/deconfinement case we perform the numerical analysis of an effective description of the transition and also provide analytic expressions using thick and thin wall approximations. For the chiral symmetry transition, we implement a variational approach that allows us to address the challenging non-linear problem stemming from the Dirac-Born-Infeld action.

Earthquakes resulting from metastable phase transitions

1965 ◽  
Vol 2 (5) ◽  
pp. 401-407 ◽  
Author(s):  
John G. Dennis ◽  
Charles T. Walker
Keyword(s):  
Phase Transitions ◽  
Metastable Phase

Metastable phase transitions and structural transformations in solid-state materials at high pressure

2007 ◽  
Vol 80 (10-12) ◽  
pp. 1003-1032 ◽  
Author(s):  
Paul F. McMillan ◽  
Olga Shebanova ◽  
Dominik Daisenberger ◽  
Raul Quesada Cabrera ◽  
Edward Bailey ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Solid State ◽  
Metastable Phase ◽  
Structural Transformations ◽  
Solid State Materials

scholarly journals NQR and Phase Transitions in Hexachlorocyclopropane Crystal

1990 ◽  
Vol 45 (3-4) ◽  
pp. 339-342 ◽  
Author(s):  
Masahiko Suhara ◽  
Koichi Mano
Keyword(s):  
Phase Transitions ◽  
Slow Rate ◽  
Metastable Phase ◽  
Phase Iii ◽  
Temperature Phase ◽  
Dsc Studies ◽  
Disordered Phase ◽  
Solid Phases ◽  
Low Temperature Phase ◽  
Phase Phase

Abstract35Cl NQR and DSC studies on phase transitions in hexachlorocyclopropane (HCCP), C3Cl6 , are reported. It is found that HCCP has three solid phases: A high temperature disordered phase (Phase I) above 301 K (no NQR spectrum was observed); a metastable phase (Phase II), which exhibited 6 NQR lines from 77 to 270 K; a low temperature phase (Phase III) in which a 24-multiplet of 35Cl NQR lines at 77 K, the most complex multiplet spectrum ever reported was observed. DSC measurement shows a A-type transition at 301 K and a broad transition of very slow rate at 285 K. The structure and mechanism of phase transitions in HCCP crystal are discussed.

High-pressure metastable phase transitions in ?-Ge3N4 studied by Raman spectroscopy

2003 ◽  
Vol 34 (7-8) ◽  
pp. 567-577 ◽  
Author(s):  
Paul F. McMillan ◽  
Sudip K. Deb ◽  
Jian-Jung Dong
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
Phase Transitions ◽  
Metastable Phase
Sign in / Sign up

Export Citation Format

Share Document