scholarly journals Numerical Study on Resistance Change Characteristics of Phase Change Materials

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yifang Su ◽  
Yihang Zhang ◽  
Kaifeng Lin ◽  
Guanjun Zhao ◽  
Qinzheng Yu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Finite Element ◽  
Phase Change ◽  
Simulation Model ◽  
Phase Change Materials ◽  
Numerical Study ◽  
Transition Process ◽  
The Finite Element Method ◽  
Resistance Change ◽  
Phase Transition Process

Phase change materials are a type of emerging materials whose states will change under certain conditions, which then lead to changes in resistance. To study the characteristics of the phase change materials, a numerical simulation model of the resistive change unit based on the finite element method and the classic nucleation/growth theory is established, while the partial differential equations of electricity and heat conduction and the discrete formula of the finite element are also derived. According to the phase transition process of phase change materials, a crystalline-amorphous simulation model is also proposed in this paper to simulate the electrical and thermal properties and phase transition process of the resistive change unit. Simulations of the resistance change unit under single pulses with different amplitudes and widths as well as the simulations under continuous pulses are conducted in this paper. These results verify the characteristics of resistance change and can provide references for selecting the parameters of the resistance change units.

IMPLICIT NUMERICAL ALGORITHM FOR THE SOLUTION OF PHASE TRANSITION PROBLEMS IN MULTI‐COMPONENT ALLOYS

2004 ◽  
Vol 9 (4) ◽  
pp. 253-266 ◽  
Author(s):  
O. V. Chtcheritsa ◽  
O. S. Mazhorova ◽  
Yu. P. Popov
Keyword(s):  
Phase Transition ◽  
Concentration Distribution ◽  
Numerical Study ◽  
Numerical Procedure ◽  
Transition Process ◽  
Interface Position ◽  
Fully Implicit ◽  
Liquid Phases ◽  
Phase Transition Process

New finite difference method for numerical study of phase transition process in multi‐component alloys is proposed. The algorithm is based on conservative fully implicit scheme and the simultaneous determination of concentration distribution in solid and liquid phases, and the interface position. The numerical procedure appears to be unconditionally stable. It is compared with a commonly used technique, which determines concentration distribution and interface position (growth rate) consequently.

Differences in Phase Change Processes Upon Heating Between Co and Zn-ZIF-4 Compounds

NANO ◽  
2018 ◽  
Vol 13 (03) ◽  
pp. 1850025 ◽  
Author(s):  
Kaihui Li ◽  
Haiyan Xiao ◽  
Jianxiong He ◽  
Hong Jiang
Keyword(s):  
Phase Transition ◽  
Thermogravimetric Analysis ◽  
Phase Change ◽  
Amorphous Phase ◽  
Transition Process ◽  
Change Processes ◽  
Zeolitic Imidazolate Frameworks ◽  
Complete Melting ◽  
Phase Transition Process

Zn and Co-ZIF-4 meta-stable compounds adopt the same topology of Zeolitic imidazolate frameworks (ZIF)-4, but differ in the metal nodes (Zn versus Co). Using calorimetric and thermogravimetric analysis, here we characterized their differences in phase change processes. Upon heating, the framework of Co-ZIF-4 meta-stable crystal undergoes the crystal-to-amorphous phase transition at 590[Formula: see text]K, which is somewhat lower than the corresponding transition previously reported in the corresponding Zn-ZIF-4. In addition, the recrystallization rate for amorphous Co-ZIF-4 is relatively higher than the corresponding one of Zn-ZIF-4. Finally, the forming Co–zni crystal begins to melt at about 824[Formula: see text]K, accompanied by quick decomposition, whereas Zn–zni undergoes complete melting which finishes at around 850[Formula: see text]K without any decomposition. Based on their differences in chemistry for Co and Zn, we elucidated the chemical origin of the discrepancies of phase transition process for Zn and Co-ZIF-4 compounds upon heating.

scholarly journals Combining Switchable Phase‐Change Materials and Phase‐Transition Materials for Thermally Regulated Smart Mid‐Infrared Modulators

2021 ◽  
pp. 2100417
Author(s):  
Xinrui Lyu ◽  
Andreas Heßler ◽  
Xiao Wang ◽  
Yunzhen Cao ◽  
Lixin Song ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Change ◽  
Phase Change Materials ◽  
Mid Infrared

Sunlight-Activated Phase Change Materials for Controlled Heat Storage and Triggered Release

2021 ◽  
Author(s):  
Yuran Shi ◽  
Mihael Gerkman ◽  
Qianfeng Qiu ◽  
Shuren Zhang ◽  
Grace G. D. Han
Keyword(s):  
Phase Transition ◽  
Solar Radiation ◽  
Phase Change ◽  
Latent Heat ◽  
Photon Energy ◽  
Organic Phase ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Triggered Release

We report the design of photo-responsive organic phase change materials that can absorb filtered solar radiation to store both latent heat and photon energy via simultaneous phase transition and photo-isomerization....

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
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