The Role of Si and Sb in the Si-Sb-Te Phase-change Material

2011 ◽  
Vol 1295 ◽  
Author(s):  
Liangcai Wu ◽  
Xilin Zhou ◽  
Zhitang Song ◽  
Henan Ni ◽  
Feng Rao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Phase Change ◽  
Phase Change Materials ◽  
Crystallization Process ◽  
Cmos Technology ◽  
Data Retention ◽  
Si Content ◽  
Device Properties ◽  
Change Material

ABSTRACTSb-rich Si-Sb-Te phase change materials with different Si contents were proposed and fabricated, and the role of Si and Sb in the Si-Sb-Te alloys was discussed. The resistance-temperature and retention properties of the Sb-rich Si-Sb-Te alloys were studied. Devices based on the Sb-rich Si-Sb-Te alloys were fabricated by a 0.18 μm CMOS technology and device properties were studied by pulsed mode resistance-voltage (R-V) measurements. Experimental results show that the crystallization temperature and data retention ability of the Sb-rich Si-Sb-Te alloys were obviously improved with increasing Si content, but the electrical properties degenerate if too much Si was added. Sb is helpful to promote the crystallization process, but excessive Sb decreases the thermal stability. So, in order to obtain practicable Sb-rich Si-Sb-Te phase change materials, suitable Si and Sb contents are required to balance the device performances between electrical switching property and thermal stability or data retention ability.

scholarly journals Insight into the role of oxygen in the phase-change material GeTe

2017 ◽  
Vol 5 (14) ◽  
pp. 3592-3599 ◽  
Author(s):  
Linggang Zhu ◽  
Zhen Li ◽  
Jian Zhou ◽  
Naihua Miao ◽  
Zhimei Sun
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Crystallization Process ◽  
Amorphous State ◽  
Data Retention ◽  
Defect Clusters ◽  
Crystallization Speed ◽  
Change Material ◽  
Insight Into

Oxygen in GeTe induces the formation of defect clusters in the crystallization process of the amorphous state, which slows down the crystallization speed and improves the data retention of phase change material GeTe.

Investigation of Time Instability Factors in Ti-SbxTe Based Phase Change Memory

2013 ◽  
Vol 873 ◽  
pp. 825-830 ◽  
Author(s):  
Xing Long Ji ◽  
Liang Cai Wu ◽  
Feng Rao ◽  
Zhi Tang Song ◽  
Min Zhu ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Crystallization Process ◽  
Phase Change Memory ◽  
Structure Model ◽  
Data Retention ◽  
Spontaneous Crystallization ◽  
Change Trend ◽  
Band Structure Model ◽  
Change Memory

In this paper, the two time instability factors in phase change memory, amorphous resistance drift and spontaneous crystallization process, are studied based on Ti2.75(SbxTe)97.25 and Ti6.85(SbxTe)93.15. The drift coefficients of both components are calculated and compared under room temperature. The reason why the drift coefficient decreases with the Ti concentration increases is discussed based on the band structure model of amorphous phase change materials. And the data retention change trend is also presented. The experiment results and the physical explaination can also be extended to other metallic element doped SbxTe alloy phase change materials.

The Experimental Research on the Thermal Properties of Shape-Stabilized Phase Change Materials

2013 ◽  
Vol 291-294 ◽  
pp. 1159-1163
Author(s):  
Quan Ying Yan ◽  
Li Hang Yue ◽  
Li Li Jin ◽  
Ran Huo ◽  
Lin Zhang
Keyword(s):  
Thermal Stability ◽  
Fatty Acid ◽  
Phase Change ◽  
Phase Change Materials ◽  
Liquid Paraffin ◽  
Capric Acid ◽  
Good Thermal Stability ◽  
Change Material ◽  
Thermal Stability Of ◽  
Better Than

This paper investigated the thermal performance of shape stabilized phase change paraffin and shape-stabilized phase change fatty acid. And the PCMs are mixtures of 60% 46# paraffin and 40% liquid paraffin, 65 % 48# paraffin and 35% liquid paraffin,30%capric acid and 70% lauric acid, 30%capric acid and 70% myristic acid. Support material is high-density polyethylene. The results in this paper show that: Thermal stability of both of the two types of phase change materials are good, thermal stability of shape stabilized phase change fatty acid is better than that of paraffin. Results in this paper can provide references and basis for the application of phase change material walls in the practice building.

The role of structural order and stiffness in the simultaneous enhancement of optical contrast and thermal stability in phase change materials

2019 ◽  
Vol 7 (14) ◽  
pp. 4132-4142 ◽  
Author(s):  
Qian Li ◽  
Kaicheng Xu ◽  
Xiaoyi Wang ◽  
Haihua Huang ◽  
Liang Ma ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Phase Change ◽  
Energy Saving ◽  
Phase Change Materials ◽  
Photonic Devices ◽  
Optical Contrast ◽  
The Past ◽  
Structural Order ◽  
Perfect Absorbers

In the past several years, phase change materials (PCMs) have been widely applied in energy-saving non-volatile photonic devices, such as active perfect absorbers, nanopixel displays and all-photonic memories.

scholarly journals Enhancing Thermal Conductivity and Photo-Driven Thermal Energy Charging/Discharging Rate of Annealed CMK-3 Based Phase Change Material

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 364 ◽  
Author(s):  
Yanfeng Chen ◽  
Cuiyin Liu ◽  
Yue Situ ◽  
Jian Liu ◽  
Hong Huang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Solar Spectrum ◽  
Heating System ◽  
Visible Range ◽  
Good Thermal Stability ◽  
Change Material

In this work, the CMK-3 is successfully prepared with SBA-15 as the template and first annealed to 2000 °C to improve thermal conductivity. The annealed CMK-3 has a thermal conductivity of 6.981 W m−1 K−1 higher than un-annealed CMK-3. The annealed CMK-3 is used to encapsulate the RT44HC, and RT44HC/annealed CMK-3 has 10-fold of thermal conductivity and enhanced thermal stability than RT44HC. The RT44HC/annealed CMK-3 has a large melting enthalpy of 177.8 J g−1 and good thermal stability. The RT44HC/annealed CMK-3 has optical absorptive coefficient of visible range of solar spectrum, which identify seven-fold higher than RT44HC. The RT44HC/annealed CMK-3 has great photo-thermal performance, and the photo-driven energy charging and discharging rate of RT44HC/annealed CMK-3 is almost 30-fold larger than the RT44HC. The results show that the annealed CMK-3 is a great mesoporous carbon nanomaterial for phase change materials and the annealed CMK-3 based phase change material has great potential in solar thermal utilizations such as solar water heating system and solar heating building systems.

Studies on Preparation and Properties of PEG/MMT Solid-Solid Phase Change Material

2012 ◽  
Vol 512-515 ◽  
pp. 1712-1715
Author(s):  
Xiao Hua Gu ◽  
Bao Yun Xu ◽  
Jia Liang Zhou ◽  
Shi Wei Li
Keyword(s):  
Thermal Stability ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Solid Phase ◽  
Energy Storage Materials ◽  
Scanning Calorimetry ◽  
Storage Behavior ◽  
Change Material

This paper details the preparation of one kind of PEG/MMT solid-solid phase change materials. With polyethylene glycol (PEG) as the phase change materials, montmorillonite (MMT) as skeletons, through the graft copolymerization method, prepare PEG/MMT solid-solid phase change energy storage materials. The structure, the phase transition behavior and thermal stability of PEG/MMT phase change materials were analyzed and studied by infrared spectroscopy (FTIR), thermogravimetry (TG) and differential scanning calorimetry (DSC), and studied the influence of different molecular weight PEG on the capability and structure of the material, polymer phase change energy storage behavior and crystallization behavior. Finally, The PEG/MMT solid-solid phase change material could improve enthalpy value and thermal stability.

Rhenium doped Sb2Te phase change material with ultrahigh thermal stability and high speed

2021 ◽  
Vol 863 ◽  
pp. 158583
Author(s):  
Junshi Zhao ◽  
Qi Liang ◽  
Ying Chen ◽  
Sifan Zhang ◽  
Zhitang Song ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Phase Change ◽  
Phase Change Material ◽  
High Speed ◽  
Change Material

scholarly journals Experimental Characterization of Phase Change Materials for Refrigeration Processes

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3033
Author(s):  
Anastasia Stamatiou ◽  
Lukas Müller ◽  
Roger Zimmermann ◽  
Jamie Hillis ◽  
David Oliver ◽  
...  
Keyword(s):  
Energy Density ◽  
Phase Change ◽  
Thermophysical Properties ◽  
Phase Change Materials ◽  
Cost Effective ◽  
Latent Heat Storage ◽  
Lower Energy Density ◽  
Change Material ◽  
Storage Units

Latent heat storage units for refrigeration processes are promising as alternatives to water/glycol-based storage due to their significantly higher energy densities, which would lead to more compact and potentially more cost-effective storages. In this study, important thermophysical properties of five phase change material (PCM) candidates are determined in the temperature range between −22 and −35 °C and their compatibility with relevant metals and polymers is investigated. The goal is to complement existing scattered information in literature and to apply a consistent testing methodology to all PCMs, to enable a more reliable comparison between them. More specifically, the enthalpy of fusion, melting point, density, compatibility with aluminum, copper, polyethylene (PE), polypropylene (PP), neoprene and butyl rubber, are experimentally determined for 1-heptanol, n-decane, propionic acid, NaCl/water mixtures, and Al(NO3)3/water mixtures. The results of the investigations reveal individual strengths and weaknesses of the five candidates. Further, 23.3 wt.% NaCl in water stands out for its very high volumetric energy density and n-decane follows with a lower energy density but better compatibility with surrounding materials and supercooling performance. The importance of using consistent methodologies to determine thermophysical properties when the goal is to compare PCM performance is highlighted.

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