Temperature‐Dependent Electronic Transport in Non‐Bulk‐Resistance‐Variation Nitrogen‐Doped Cr 2 Ge 2 Te 6 Phase‐Change Material

2020 ◽  
pp. 2000415
Author(s):  
Yi Shuang ◽  
Shogo Hatayama ◽  
Daisuke Ando ◽  
Yuji Sutou
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Electronic Transport ◽  
Temperature Dependent ◽  
Bulk Resistance ◽  
Nitrogen Doped ◽  
Resistance Variation ◽  
Change Material

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

Enhanced Thermal Rectification of Near-Field Thermal Diode Using Surface Gratings

2016 ◽  
Author(s):  
Alok Ghanekar ◽  
Jun Ji ◽  
Mingdi Sun ◽  
Zongqin Zhang ◽  
Yi Zheng
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Phase Change Material ◽  
Near Field ◽  
Forward Bias ◽  
Dissimilar Materials ◽  
Temperature Dependent ◽  
Thermal Rectification ◽  
Rectification Factor ◽  
Change Material

We demonstrate workings of a near-field thermal rectification device that uses phase change material to achieve asymmetry in heat transfer. We exploit the temperature dependent dielectric properties of VO2 due metal-insulator transition near 341 K. The device operates near the critical temperature of the phase change material. Analogous to an electrical diode, heat transfer coefficient is very high in one direction (forward bias) while it is very small when the polarity of temperature gradient is reversed (reverse bias). Rectification as high as 15 can be obtained for minimal temperature difference of 5 K. We show that high rectification is achieved by using 1-D triangular and rectangular surface gratings. The rectification factor is dramatically enhanced in the near-field due to the spectral mismatch between dissimilar materials for the negative polarity.

Identification of the temperature-dependent thermal boundary resistance at a metal-phase change material

2012 ◽  
Vol 20 (7) ◽  
pp. 941-950
Author(s):  
Jean-Luc Battaglia ◽  
Vincent Schick ◽  
Andrzej Kusiak ◽  
Clément Rossignol ◽  
Claudia Wiemer ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Boundary Resistance ◽  
Metal Phase ◽  
Thermal Boundary Resistance ◽  
Temperature Dependent ◽  
Change Material

Contact resistance change memory using N-doped Cr2Ge2Te6 phase-change material showing non-bulk resistance change

2018 ◽  
Vol 112 (18) ◽  
pp. 183504 ◽  
Author(s):  
Y. Shuang ◽  
Y. Sutou ◽  
S. Hatayama ◽  
S. Shindo ◽  
Y. H. Song ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Phase Change ◽  
Phase Change Material ◽  
Bulk Resistance ◽  
Resistance Change ◽  
Change Material ◽  
Change Memory

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.

An analysis of phase change material as thermal mass

2008 ◽  
Vol 464 (2092) ◽  
pp. 1029-1056 ◽  
Author(s):  
M.J Richardson ◽  
A.W Woods
Keyword(s):  
Phase Change ◽  
Penetration Depth ◽  
Phase Change Material ◽  
Dimensionless Parameter ◽  
Thermal Inertia ◽  
Thermal Mass ◽  
Temperature Dependent ◽  
Conventional Concrete ◽  
Infinite Mass ◽  
Change Material

Temperature fluctuations within a building can be attenuated by thermal mass. Adding phase change material (PCM) to thermal mass increases the effective heat capacity during the phase transition. This can anchor the temperature of the mass in a narrow band around the melting point of the PCM, further reducing the temperature swings perceived by occupants of the room. A simple dimensionless model for thermal mass forced by a sinusoidally varying air temperature is developed to calculate the performance of the PCM. The mass temperature satisfies the heat equation, with a temperature-dependent thermal diffusivity, and is solved numerically. For a given PCM, the energy stored and returned to the room, the surface temperature amplitude and the penetration depth of heat pulses into a hypothetical semi-infinite mass can all be calculated as a function of a single dimensionless parameter. For optimal performance, the latent heat of the PCM should be as large as possible, the melting temperature range should be narrow and the thickness of the mass should exceed the penetration depth. The PCM wallboard is shown to be potentially as effective as conventional concrete, so lightweight buildings could enjoy the benefits of thermal inertia commonly associated with heavyweight structures.

NUMERICAL STUDY OF A SOLAR GREENHOUSE DRYER WITH A PHASE-CHANGE MATERIAL AS AN ENERGY STORAGE MEDIUM

2018 ◽  
Vol 49 (6) ◽  
pp. 509-528 ◽  
Author(s):  
Orawan Aumporn ◽  
Belkacem Zeghmati ◽  
Xavier Chesneau ◽  
Serm Janjai
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Numerical Study ◽  
Storage Medium ◽  
Solar Greenhouse ◽  
Change Material
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