Electric-Field-Driven Phase Transition Process in (K, Na, Li)(Nb, Ta, Sb)O3 Lead-Free Piezoceramics

2015 ◽  
Vol 99 (1) ◽  
pp. 135-140 ◽  
Author(s):  
Wei Feng ◽  
Haiwei Du ◽  
Chen Chen ◽  
Yanqiu Huang
Keyword(s):  
Phase Transition ◽  
Electric Field ◽  
Transition Process ◽  
Lead Free ◽  
Phase Transition Process

Phase Transition-Induced Modulation of Exchange Bias in Fe/BiFeO3 Bilayers

2020 ◽  
Vol 12 (5) ◽  
pp. 701-706
Author(s):  
Liyan Wang ◽  
Zongguo Li ◽  
Cong Wang ◽  
Xue Gong ◽  
Changzheng Wang
Keyword(s):  
Phase Transition ◽  
Electric Field ◽  
Exchange Interaction ◽  
Exchange Bias ◽  
Domain Walls ◽  
Ferromagnetic Layer ◽  
Transition Process ◽  
Phase Transition Process ◽  
Antiferromagnetic Layer ◽  
Ferromagnetic Magnetization

Many of researches indicate that epitaxial BiFeO3 (BFO) films deposited on LaAlO3 (LAO) substrate undergo strain-driven phase transition from a tetragonal-like phase (T-BFO) to a rhombohedral-like phase (R-BFO), and a mixed phase (M-BFO) that T-BFO coexists with R-BFO forms in the phase transition process. It is necessary to explore how BFO phase transition affects the exchange bias in ferromagnet (FM)/BFO bilayers. In our studies, aforementioned BFO phase transition is accomplished by varying BFO films thickness. Using 5 nm-thick Fe as ferromagnetic layer deposited on 9–354 nm-thick BFO as antiferromagnetic layer, the exchange bias in Fe/BFO bilayers exhibits that Fe/M-BFO bilayers shows smaller exchange bias than Fe/T-BFO and Fe/R-BFO bilayers. We ascribed the effect of the BFO phase transition on the exchange bias to the domain walls caused by the exchange interaction between T-BFO and R-BFO across their boundaries. Additionally, for the same reason, the coercivity also exhibits the same variation trend as the exchange bias does. Our studies will help to promote the application of controlling the ferromagnetic magnetization by the electric field.

The effect of Argon pressure dependent V thin film on the phase transition process of (020) VO2 thin film

2018 ◽  
Vol 427 ◽  
pp. 304-311 ◽  
Author(s):  
Yifan Meng ◽  
Kang Huang ◽  
Zhou Tang ◽  
Xiaofeng Xu ◽  
Zhiyong Tan ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Transition Process ◽  
Argon Pressure ◽  
Phase Transition Process

Exploration of Doubly Thermal Phase Transition Process of PDEGA-b-PDMA-b-PVCL in Water

Langmuir ◽  
2016 ◽  
Vol 32 (26) ◽  
pp. 6691-6700 ◽  
Author(s):  
Zhangxin Ye ◽  
Youcheng Li ◽  
Zesheng An ◽  
Peiyi Wu
Keyword(s):  
Phase Transition ◽  
Transition Process ◽  
Thermal Phase Transition ◽  
Phase Transition Process ◽  
Thermal Phase

A New Lattice Boltzmann Model for Phase Transition Process

2009 ◽  
Author(s):  
Longjian Li ◽  
Jianbang Zeng ◽  
Quan Liao ◽  
Wenzhi Cui
Keyword(s):  
Phase Transition ◽  
Lattice Boltzmann ◽  
Equations Of State ◽  
Density Ratio ◽  
Transition Process ◽  
Lattice Boltzmann Model ◽  
New Model ◽  
Phase Transition Process ◽  
Simulation Results ◽  
Boltzmann Model

A new lattice Boltzmann model, which is based on Shan-Chen (SC) model, is proposed to describe liquid-vapor phase transitions. The new model is validated through simulation of the one-component phase transition process. Compared with the simulation results of van der Waals fluid and the Maxwell equal-area construction, the results of new model are closer to the analytical solutions than those of SC model and Zhang model. Since the range of temperature and the maximum density ratio are increased, and the value of maximum spurious current is between those of SC and Zhang models, it is believed that this new model has better stability than SC and Zhang models. Therefore, the application scope of this new model is expanded. According to the principle of corresponding states in Engineering Thermodynamics, the simulations of water and ammonia phase transition process are implemented by using this new model with different equations of state. Compared to the experimental data of water and ammonia, the results show that the Peng-Robinson equation of state is more suitable to describe the water, ammonia and other substances phase transition process. Therefore, these simulation results have great significance for the real engineering applications.

CROSSOVER FROM RABI TO JOSEPHSON DYNAMICS IN TWO-COUPLED BOSE–EINSTEIN CONDENSATES AS A PHASE TRANSITION PROCESS

2002 ◽  
Vol 16 (27) ◽  
pp. 1021-1026 ◽  
Author(s):  
ARANYABHUTI BHATTACHERJEE ◽  
MAN MOHAN
Keyword(s):  
Phase Transition ◽  
Mean Field ◽  
Perturbation Expansion ◽  
Transition Process ◽  
Field Energy ◽  
Linear Perturbation ◽  
Small Oscillations ◽  
Phase Transition Process ◽  
Tunneling Matrix Element ◽  
Bose Einstein

Crossover from individual Rabi dynamics to collective Josephson dynamics in two-coupled Bose–Einstein condensates is studied as a phase transition process. We obtain the critical value of the parameter Λ (ratio of the mean field energy to the tunneling matrix element) for the π-phase oscillations from the non-linear perturbation expansion of small oscillations around the saddle point of the first-order Euclidean (imaginary time) differential equations for polar and azimuthal angles θ and ϕ without approximation.

Simulation of phase transition process using lattice Boltzmann method

2009 ◽  
Vol 54 (24) ◽  
pp. 4596-4603 ◽  
Author(s):  
JianBang Zeng ◽  
LongJian Li ◽  
Quan Liao ◽  
WenZhi Cui ◽  
QingHua Chen ◽  
...  
Keyword(s):  
Phase Transition ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Transition Process ◽  
Phase Transition Process ◽  
Boltzmann Method

The structural phase transition process of free-standing monoclinic vanadium dioxide micron-sized rods: temperature-dependent Raman study

RSC Advances ◽  
2015 ◽  
Vol 5 (101) ◽  
pp. 83139-83143 ◽  
Author(s):  
Huafang Zhang ◽  
Quanjun Li ◽  
Pengfei Shen ◽  
Qing Dong ◽  
Bo Liu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Vanadium Dioxide ◽  
Structural Phase ◽  
Transition Process ◽  
Temperature Dependent ◽  
Free Standing ◽  
Lower Phase ◽  
Phase Transition Process ◽  
Raman Study

Micro-sized rods show a lower phase transition temperature than nano-sized rods, and this is interpreted on the basis of nucleating defects.

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