Calorimetric measurements of structural relaxation and glass transition temperatures in sputtered films of amorphous Te alloys used for phase change recording

2007 ◽  
Vol 22 (3) ◽  
pp. 748-754 ◽  
Author(s):  
J.A. Kalb ◽  
M. Wuttig ◽  
F. Spaepen
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Amorphous Phase ◽  
Structural Relaxation ◽  
Continuous Heating ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures ◽  
Sputtered Films ◽  
Calorimetric Measurements ◽  
History Of

Sputtered amorphous Ge4Sb1Te5, Ge1Sb2Te4, Ge2Sb2Te5, and Ag0.055In0.065Sb0.59Te0.29 thin films were studied by differential scanning calorimetry. Upon continuous heating, heat release due to structural relaxation of the amorphous phase between 0.5 and 1.0 kJ/mol was observed. This value depends on the thermal history of the sample. Preannealing of the amorphous phase revealed the glass transition temperature Tg within 10 K of the crystallization temperature upon continuous heating at 40 K/min.

The Effect of Solvent on the Miscibility of Blends of Poly 1-[4-(3-carboxy-4-hydroxy-phenylazo)benzene Sulphonamido -1,2-ethanediyl, sodium salt)] (PAZO) and Polyhydroxybutyrate, (PHB)

2005 ◽  
Vol 13 (5) ◽  
pp. 443-452 ◽  
Author(s):  
*Lakshmi Sharma ◽  
Koji Nishida ◽  
Toshiji Kanaya
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Sodium Salt ◽  
Cost Effective ◽  
Photonic Materials ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures ◽  
Effect Of Solvent ◽  
Photonic Material ◽  
Commercial World

The commercial world demands new photonic materials, pandering to the consumer's every whim. The target now is to produce an eco-friendly, cost-effective photonic material. This is possible by blending poly 1-[4-(3-carboxy-4-hydroxy-phenylazo)benzene sulphonamido-1,2-ethanediyl, sodium salt)], (PAZO), with polyhydroxybutyrate, (PHB). We analysed the behaviour of PAZO/PHB blends in various solvents, dependent on the solubility parameter calculations for amorphous PHB. Differential Scanning Calorimetry was employed to determine the glass transition temperatures and to assess miscibility. This paper aims to address and establish the effect of the solvent on the miscibility of PHB/PAZO blends. We have established that a complex, is formed at high PHB concentrations, via the O-H bond of the PHB and PAZO in all solvents.

scholarly journals Differential Scanning Calorimetry for Determining the Thermodynamic Properties of Selected Honeys

2015 ◽  
Vol 59 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Jolanta Tomaszewska-Gras ◽  
Sławomir Bakier ◽  
Kamila Goderska ◽  
Krzysztof Mansfeld
Keyword(s):  
Differential Scanning Calorimetry ◽  
Heat Capacity ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermodynamic Properties ◽  
Sugar Content ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures ◽  
Complete Liquefaction

Abstract Thermodynamic properties of selected honeys: glass transition temperature (Tg), the change in specifi c heat capacity (ΔCp), and enthalpy (ΔH) were analysed using differential scanning calorimetry (DSC) in relation to the composition i.e. water and sugar content. Glass transition temperatures (Tg) of various types of honey differed significantly (p<0.05) and ranged from -49.7°C (polyfloral) to -34.8°C (sunflower). There was a strong correlation between the Tg values and the moisture content in honey (r = -0.94). The degree of crystallisation of the honey also influenced the Tg values. It has been shown that the presence or absence of sugar crystals influenced the glass transition temperature. For the decrystallised honeys, the Tg values were 6 to 11°C lower than for the crystallised honeys. The more crystallised a honey was, the greater the temperature difference was between the decrystallised and crystallized honey. In conclusion, to obtain reliable DSC results, it is crucial to measure the glass transition after the complete liquefaction of honey.

Synthesis and Properties of Poly (N-arylenebenzimidazole ketone)s

2014 ◽  
Vol 881-883 ◽  
pp. 165-168
Author(s):  
Xiang Wang Cui ◽  
Lin Zhang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Coupling Reaction ◽  
Transition Temperatures ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures

Two bis (benzimidazoyl) monomers were synthesized, and Poly (N-arylenebenzimidazole ketone) s were prepared by N-C coupling reaction that replaced the NH sites from the bis (benzimidazolyl) derivatives with activated difluorides monomers in sulfolane at 210 °C. All the resulting polymers showed easy solubility compared with traditional polybenzimidazoles. Differential scanning calorimetry and thermogravimetric measurements showed that the polymers had high glass transition temperatures (>240 °C), good thermostability and high decomposition temperatures (>460 °C).

Structural Relaxation and Crystallization in a Pd40Cu30Ni10P20 Bulk Metallic Glass

2003 ◽  
Vol 806 ◽  
Author(s):  
R. Raghavan ◽  
U. Ramamurty ◽  
J. Basu ◽  
S. Ranganathan ◽  
N. Nishiyama
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Structural Relaxation ◽  
Short Range ◽  
Annealing Temperature ◽  
Scanning Calorimetry ◽  
Short Range Ordering ◽  
The Stability

ABSTRACTThe stability of a Pd40Cu30Ni10P20 bulk metallic glass (BMG) against structural relaxation is investigated by isothermal and isochronal annealing heat treatments below and above its glass transition temperature, Tg, for varying periods. Differential scanning calorimetry (DSC) of the annealed samples shows an excess endotherm at Tg, irrespective of the annealing temperature. This recovery peak evolves exponentially with annealing time and is due to the destruction of anneal-induced compositional short range ordering. The alloy exhibits a high resistance to crystallization on annealing below Tg and complex Pd- and Ni-phosphides evolve on annealing above Tg.

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