Evolution of the Local Structure Surrounding Nitrogen Atoms upon the Amorphous to Crystalline Phase Transition in Nitrogen-doped Cr2Ge2Te6 Phase-Change Material

2021 ◽  
pp. 149760
Author(s):  
Yi Shuang ◽  
Shogo Hatayama ◽  
Yuta Saito ◽  
Paul Fons ◽  
Alexander V. Kolobov ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Change ◽  
Phase Change Material ◽  
Crystalline Phase ◽  
Local Structure ◽  
Nitrogen Doped ◽  
Change Material ◽  
Crystalline Phase Transition

scholarly journals Nitrogen doping-induced local structure change in a Cr2Ge2Te6 inverse resistance phase-change material

2020 ◽  
Vol 1 (7) ◽  
pp. 2426-2432
Author(s):  
Yi Shuang ◽  
Shogo Hatayama ◽  
Hiroshi Tanimura ◽  
Daisuke Ando ◽  
Tetsu Ichitsubo ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Phase Change ◽  
Phase Change Material ◽  
Local Structure ◽  
Nitrogen Doping ◽  
Structure Change ◽  
Nitrogen Doped ◽  
Change Mechanism ◽  
Change Material

This work investigated the phase change mechanism of a nitrogen-doped Cr2Ge2Te6 phase change material via Raman scattering.

Synthesis and Study of Microcapsules with Beeswax Core and Phenol-Formaldehyde Shell Using the Taguchi Method

2021 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Tejashree Amberkar ◽  
Prakash Mahanwar
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Taguchi Method ◽  
Phase Change ◽  
Phase Change Material ◽  
Surfactant Concentration ◽  
Phenol Formaldehyde ◽  
Processing Parameters ◽  
Agitation Speed ◽  
Change Material

Phenol-formaldehyde shelled phase change material microcapsules (MPCMs) were fabricated and their processing parameters were analyzed with the Taguchi method. Core to shell ratio, surfactant concentration and speed of mixing are the parameters that were optimized in five levels. The optimized values for the surfactant concentration, core to shell ratio and agitation speed were 3%, 1:1 and 800 rpm, respectively. The obtained microcapsules were spherical in shape. The melting enthalpy of the MPCMs synthesized with optimized processing parameters was 148.93 J/g in 35–62 °C. The obtained temperature range of phase transition temperature can be used for storing different food articles such as chocolate and hot served foods.

Preparation of RHA-Paraffin Phase Change Materials

2011 ◽  
Vol 399-401 ◽  
pp. 1156-1159
Author(s):  
Jun Wang ◽  
Bao Guo Ma ◽  
Jian Liang Zhang ◽  
Wen Yang
Keyword(s):  
Phase Transition ◽  
Phase Change ◽  
Phase Change Material ◽  
Rice Husk ◽  
Absorption Rate ◽  
Phase Change Materials ◽  
Rice Husk Ash ◽  
Dsc Analysis ◽  
Change Material ◽  
Enthalpy Of Phase Transition

In this paper, a kind of RHA-paraffin phase change material was prepared, and the SEM was used for observing its internal morphologies, DSC analysis was carried out for detecting its temperature and enthalpy of phase transition. The results showed that rice husk ash have a greater absorption rate for paraffin; a large number of pores of the RHA were filled by paraffin in the RHA-paraffin phase change material, and the absorption rate can reach 53.5%.

Thermally switchable terahertz metasurface absorber composed of H-fractal and enabled by phase-change material of vanadium dioxide

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hassan Divdel ◽  
Hamed Taghipour-Farshi ◽  
Hassan Rasooli Saghai ◽  
Mohammad-Ali Tavakoli Ghazi Jahani
Keyword(s):  
Phase Transition ◽  
Phase Change ◽  
Phase Change Material ◽  
Vanadium Dioxide ◽  
Ground Plane ◽  
Terahertz Range ◽  
Metallic State ◽  
Level 1 ◽  
Change Material ◽  
Level 2

Abstract A terahertz metasurface absorber with actively switchable bandwidth enabled by vanadium dioxide (VO2) is presented and investigated numerically. The VO2 is a phase-change material and its conductivity in the terahertz range changes by several orders of magnitude upon phase-transition. The metasurface consists of an H-shaped fractal resonator placed on top of a polyimide spacer and a ground-plane of gold. The resonator is composed of an H-shaped level-1 fractal of gold and VO2 strips that converts it to a level-2 fractal. At room temperatures, the VO2 is in the insulator state and the resonator reduces to a level-1 fractal offering narrowband absorption at 8.08 THz reaching 0.98 absorption. At higher temperatures, the VO2 is in the metallic state and the resonator is effectively a level-2 fractal with an absorption higher than 0.9 in a bandwidth of 6.63–9.89 THz.

Nitrogen-doped Sb-rich Si–Sb–Te phase-change material for high-performance phase-change memory

2013 ◽  
Vol 61 (19) ◽  
pp. 7324-7333 ◽  
Author(s):  
Xilin Zhou ◽  
Liangcai Wu ◽  
Zhitang Song ◽  
Yan Cheng ◽  
Feng Rao ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
High Performance ◽  
Phase Change Memory ◽  
Nitrogen Doped ◽  
Change Material ◽  
Change Memory

In situ Raman and Time-Resolved Luminescence Investigation of the Local Structure of ZrO2 in the Amorphous to Crystalline Phase Transition

2012 ◽  
Vol 116 (31) ◽  
pp. 16776-16783 ◽  
Author(s):  
Carmen Tiseanu ◽  
Vasile I. Parvulescu ◽  
Bogdan Cojocaru ◽  
Kelly Pemartin ◽  
Margarita Sanchez-Dominguez ◽  
...  
Keyword(s):  
Phase Transition ◽  
Crystalline Phase ◽  
Local Structure ◽  
Time Resolved ◽  
In Situ Raman ◽  
Luminescence Investigation ◽  
Crystalline Phase Transition

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.

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