Laser-Induced Phase Transformation of Sb-Te Alloy Films for Optical Storage

1988 ◽  
Vol 100 ◽  
Author(s):  
Susumu Fujimori ◽  
Shogo Yagi ◽  
Hiroki Yamazaki ◽  
Nobuhiro Funakoshi
Keyword(s):  
Phase Transformation ◽  
Phase Change ◽  
Phase Transformations ◽  
Crystalline Phase ◽  
Optical Storage ◽  
Optical Recording ◽  
Alloy Films

ABSTRACTSb-Te alloy films are developed as rewritable optical recording materials based on amorphous-crystalline phase transformations. Sb2 Te3 is shown to be the best practical phase change medium.

Phase-Change Media for High-Density Optical Recording

2001 ◽  
Vol 674 ◽  
Author(s):  
Herman Borg ◽  
Martijn Lankhorst ◽  
Erwin Meinders ◽  
Wouter Leibbrandt
Keyword(s):  
Phase Change ◽  
Data Storage ◽  
Laser Heating ◽  
Phase Change Materials ◽  
Optical Storage ◽  
Sputter Deposition ◽  
Optical Recording ◽  
Thermal Design ◽  
Recording Media ◽  
Audio Video

ABSTRACTRewritable optical-storage systems are quickly gaining market share in audio, video and data- storage applications. The development of new rewritable optical-storage formats with higher capacity and data rate critically depends on innovations made to the recording media incorporating so-called phase-change materials. These materials allow reversible switching between a low and high reflective state induced by laser heating. In this paper, we highlight phase-change media aspects as optical and thermal design, sputter-deposition, materials optimization, and the development of new recording strategies. Focus is on the speed race in optical recording.

The DSC Investigation on Phase Transformations of Directionally Solidified (DS) and Powder Metallurgy (PM) Ni-Base Superalloys

2018 ◽  
Vol 941 ◽  
pp. 1035-1040
Author(s):  
Liang Zheng ◽  
Yu Feng Liu ◽  
Michael J. Gorley ◽  
Zu Liang Hong ◽  
Sarah Day ◽  
...  
Keyword(s):  
Particle Size ◽  
Phase Transformation ◽  
Powder Metallurgy ◽  
Phase Change ◽  
Phase Transformations ◽  
Cooling Rate ◽  
Cooling Curves ◽  
Directionally Solidified ◽  
Transformation Temperatures ◽  
Heating And Cooling

The phase transformations of the directionally solidified (DS) and powder metallurgy (PM) Ni-base superalloys were investigated by JMatPro, synchrotron XRD (SXRD) and differential scanning calorimetry (DSC). The minor phases, such as MC, eutectic γ′ and Ni5Hf, and γ matrix with secondary γ′ existed in as-cast microstructure of DS DZ22. However, only γ matrix was found in PM625 alloy powders. The phase change in both heating (melting) and cooling (solidification) process was investigated by DSC on DZ22 test bar and PM625 alloy powders respectively. The DSC experiment with different heating/cooling rates (5-40°C/min) was performed on DS superalloy DZ22. The results indicated that the heating/cooling rate had obvious effect on the DSC results of the phase transformation temperatures of liquidus, MC carbides, solidus, eutectic (γ+γ′) and secondary γ′. The heating and cooling DSC curves shifted to high and low temperature direction respectively, accompanied by the heating/cooling rate increased. However, the average values of specific peaks of heating and cooling curves are relatively consistent which is close to the equilibrium phase change temperatures of the alloy and makes the results comparable. Besides the average value method, the liquidus temperature of the alloy (0°C/min) can also be obtained by method of linear-fit/extrapolating from 5-40°C/min heating/cooling rates or inflection point deviate from the baseline of DSC cooling curves which could minimize the heating/cooling rate effects. The DSC experiment was carried out on PM625 superalloy powders with different particle size range (0-355μm), the results indicated that the particle size had minor effect on liquidus and solidus temperatures of DSC heating curves, the differences were less than 2°C. The change in phase transformation temperatures under different heating/cooling rate should be considered for selecting the process parameter (heat treatment, HIP or casting) for manufacturing Ni-base superalloy components.

Thermally stimulated crystalline phase transformations in metastable Fe–Cr alloy films prepared by pulsed laser deposition

2002 ◽  
Vol 347 (1-2) ◽  
pp. 171-177 ◽  
Author(s):  
A.A Levin ◽  
D.C Meyer ◽  
A Gorbunov ◽  
A Tselev ◽  
W Pompe ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Pulsed Laser Deposition ◽  
Crystalline Phase ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Alloy Films

In Situ Study of Vacancy Disordering in Crystalline Phase-Change Materials Under Electron Beam Irradiation

2019 ◽  
Author(s):  
Ting-Ting Jiang ◽  
Xu-Dong Wang ◽  
Jiang-Jing Wang ◽  
Yu-Xing Zhou ◽  
Dan-Li Zhang ◽  
...  
Keyword(s):  
Electron Beam ◽  
Phase Change ◽  
Crystalline Phase ◽  
Electron Beam Irradiation ◽  
Phase Change Materials ◽  
Beam Irradiation ◽  
In Situ Study

Heat capacities and enthalpies of fusion and transformation for solvates of some salts with dimethyl sulfoxide and dimethylformamide

1988 ◽  
Vol 53 (12) ◽  
pp. 3072-3079
Author(s):  
Mojmír Skokánek ◽  
Ivo Sláma
Keyword(s):  
Heat Capacity ◽  
Phase Transformation ◽  
Phase Transformations ◽  
Dimethyl Sulfoxide ◽  
Liquidus Temperature ◽  
Molar Heat Capacity ◽  
Solid Phase ◽  
Zinc Nitrate ◽  
Heat Capacities ◽  
Liquid Phases

Molar heat capacities and molar enthalpies of fusion of the solvates Zn(NO3)2 . 2·24 DMSO, Zn(NO3)2 . 8·11 DMSO, Zn(NO3)2 . 6 DMSO, NaNO3 . 2·85 DMSO, and AgNO3 . DMF, where DMSO is dimethyl sulfoxide and DMF is dimethylformamide, have been determined over the temperature range 240 to 400 K. Endothermic peaks found for the zinc nitrate solvates below the liquidus temperature have been ascribed to solid phase transformations. The molar enthalpies of the solid phase transformations are close to 5 kJ mol-1 for all zinc nitrate solvates investigated. The dependence of the molar heat capacity on the temperature outside the phase transformation region can be described by a linear equation for both the solid and liquid phases.

Electron Microscopy Study on Amorphous Ge-Sb-Te Thin Film for Phase Change Optical Recording

2003 ◽  
Vol 42 (Part 2, No. 10A) ◽  
pp. L1158-L1160 ◽  
Author(s):  
Muneyuki Naito ◽  
Manabu Ishimaru ◽  
Yoshihiko Hirotsu ◽  
Masaki Takashima
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Phase Change ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Optical Recording

New chalcogenide alloy as phase-change optical recording material

2001 ◽  
Author(s):  
Yagya D. Sharma ◽  
Laxman Singh ◽  
Promod K. Bhatnagar
Keyword(s):  
Phase Change ◽  
Optical Recording ◽  
Recording Material
Sign in / Sign up

Export Citation Format

Share Document