scholarly journals Role of Nuclearity-Dependent Properties of Small Clusters in the Nucleation Process and Thermal Hysteresis at the Phase Transition†

2003 ◽  
Vol 107 (30) ◽  
pp. 7299-7302 ◽  
Author(s):  
J. Belloni ◽  
P. Pernot
Keyword(s):  
Phase Transition ◽  
Thermal Hysteresis ◽  
Nucleation Process ◽  
Small Clusters

scholarly journals Following the Martensitic Configuration Footprints in the Transition Route of Ni-Mn-Ga Magnetic Shape Memory Films: Insight into the Role of Twin Boundaries and Interfaces

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2103
Author(s):  
Milad Takhsha Ghahfarokhi ◽  
Lucia Nasi ◽  
Francesca Casoli ◽  
Simone Fabbrici ◽  
Giovanna Trevisi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Shape Memory ◽  
Thermal Hysteresis ◽  
Martensitic Phase ◽  
Atomic Scale ◽  
Martensitic Transition ◽  
Epitaxial Thin Films ◽  
Magnetic Shape Memory ◽  
Transition Range

Magnetic shape memory Heuslers have a great potential for their exploitation in next-generation cooling devices and actuating systems, due to their “giant” caloric and thermo/magnetomechanical effects arising from the combination of magnetic order and a martensitic transition. Thermal hysteresis, broad transition range, and twinning stress are among the major obstacles preventing the full exploitation of these materials in applications. Using Ni-Mn-Ga seven-modulated epitaxial thin films as a model system, we investigated the possible links between the phase transition and the details of the twin variants configuration in the martensitic phase. We explored the crystallographic relations between the martensitic variants from the atomic-scale to the micro-scale through high-resolution techniques and combined this information with the direct observation of the evolution of martensitic twin variants vs. temperature. Based on our multiscale investigation, we propose a route for the martensitic phase transition, in which the interfaces between different colonies of twins play the major role of initiators for both the forward and reverse phase transition. Linking the martensitic transition to the martensitic configuration sheds light onto the possible mechanisms influencing the transition and paves the way towards microstructure engineering for the full exploitation of shape memory Heuslers in different applications.

scholarly journals Role of charged gauge fields in generating magnetic seed fields in bubble collisions during the cosmological electroweak phase transition

2008 ◽  
Vol 77 (2) ◽  
Author(s):  
Trevor Stevens ◽  
Mikkel B. Johnson ◽  
Leonard S. Kisslinger ◽  
Ernest M. Henley ◽  
W.-Y Pauchy Hwang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Gauge Fields ◽  
Electroweak Phase Transition

The role of π-bonding on the high temperature structure of the double perovskites Ba2CaUO6and BaSrCaUO6

2015 ◽  
Vol 44 (36) ◽  
pp. 16036-16044 ◽  
Author(s):  
Emily Reynolds ◽  
Gordon J. Thorogood ◽  
Maxim Avdeev ◽  
Helen E. A. Brand ◽  
Qinfen Gu ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Neutron Diffraction ◽  
Temperature Structure ◽  
Double Perovskites ◽  
Phase Transition Behavior ◽  
X Ray ◽  
Progressive Loss ◽  
Octahedral Tilting

High temperature synchrotron X-ray and neutron diffraction powder diffraction studies of the uranium perovskites Ba2CaUO6and BaSrCaUO6reveal unusual phase transition behavior associated with the progressive loss of cooperative octahedral tilting.

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