Direct observation of amorphous to crystalline phase transitions in nanoparticle arrays of phase change materials

2007 ◽  
Vol 102 (9) ◽  
pp. 094305 ◽  
Author(s):  
Simone Raoux ◽  
Charles T. Rettner ◽  
Jean L. Jordan-Sweet ◽  
Andrew J. Kellock ◽  
Teya Topuria ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Phase Change ◽  
Direct Observation ◽  
Crystalline Phase ◽  
Phase Change Materials ◽  
Nanoparticle Arrays

Resonant bonding in crystalline phase-change materials

2008 ◽  
Vol 7 (8) ◽  
pp. 653-658 ◽  
Author(s):  
Kostiantyn Shportko ◽  
Stephan Kremers ◽  
Michael Woda ◽  
Dominic Lencer ◽  
John Robertson ◽  
...  
Keyword(s):  
Phase Change ◽  
Crystalline Phase ◽  
Phase Change Materials

Direct observation of structural transitions in the phase change material Ge2Sb2Te5

2016 ◽  
Vol 4 (39) ◽  
pp. 9303-9309 ◽  
Author(s):  
Ruiwen Shao ◽  
Kun Zheng ◽  
Yongjin Chen ◽  
Bin Zhang ◽  
Qingsong Deng ◽  
...  
Keyword(s):  
Electric Field ◽  
Phase Change ◽  
Phase Change Material ◽  
Direct Observation ◽  
Crystalline Phase ◽  
Structural Transitions ◽  
Single Crystalline ◽  
Multi Level ◽  
Change Material

Electric field-induced transitions from an amorphous to a polycrystalline to a single-crystalline phase in Ge2Sb2Te5were observed, which corresponded to multi-level changes in resistance.

scholarly journals Reliable 2D Phase Transitions for Low-Noise and Long-Life Memory Programming

2021 ◽  
Vol 3 ◽  
Author(s):  
Keyuan Ding ◽  
Tianci Li ◽  
Bin Chen ◽  
Feng Rao
Keyword(s):  
Phase Transitions ◽  
Phase Change ◽  
Large Scale ◽  
Phase Change Materials ◽  
Random Access ◽  
New Physics ◽  
Low Noise ◽  
Fine Tuning ◽  
Premature Failure ◽  
Long Life

Extending cycling endurance and suppressing programming noise of phase-change random-access memory (PCRAM) are the key challenges with respect to the development of nonvolatile working memory and high-accuracy neuromorphic computing devices. However, the large-scale atomic migration along electrical pulse direction in the unconstrained three-dimensional phase transitions of the phase-change materials (PCMs) induces big resistance fluctuations upon repeated programming and renders the classic PCRAM devices into premature failure with limited cycling endurance. Previous efforts of superlattice-like and superlattice PCM schemes cannot effectively resolve such issues. In this work, we demonstrated that, through fine-tuning the sputtering techniques, a phase-change heterostructure (PCH) of Sb2Te3/TiTe2 can be successfully constructed. In contrast to its superlattice-like counterpart with inferior crystal quality, the well-textured PCH architecture ensures the reliable (well-confined) two-dimensional phase transitions, promoting an ultralow-noise and long-life operation of the PCRAM devices. Our study thus provides a useful reference for better manufacturing the PCH architecture and further exploring the excellent device performances and other new physics.

scholarly journals Thermal conductivity of PCM materials based on a composite consisting of n-alkane and nanoscale additives

2021 ◽  
Vol 2103 (1) ◽  
pp. 012094
Author(s):  
A K Borisov ◽  
V M Egorov ◽  
V A Marikhin ◽  
L P Myasnikova
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Phase Transitions ◽  
Composite Materials ◽  
Phase Change ◽  
Supramolecular Structure ◽  
Phase Change Materials

Abstract Composites based on n-alkane and nanoscale additives were investigated to determine the efficiency of heat transfer during phase transitions in phase change materials. It was found that the thermal conductivity of composite materials is several times higher than the thermal conductivity of the initial n-alkane. The observed effect is due to the specificity of the supramolecular nanostructure of the composite, which differs from the supramolecular structure of the nonadecane.

Phase transitions in Ge–Te phase change materials studied by time-resolved x-ray diffraction

2009 ◽  
Vol 95 (14) ◽  
pp. 143118 ◽  
Author(s):  
Simone Raoux ◽  
Becky Muñoz ◽  
Huai-Yu Cheng ◽  
Jean L. Jordan-Sweet
Keyword(s):  
Phase Transitions ◽  
Phase Change ◽  
Phase Change Materials ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray
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