Composition dependence of the heat capacity jump in Ge-Se-In chalcogenide glasses

2004 ◽  
Vol 39 (19) ◽  
pp. 6141-6143 ◽  
Author(s):  
G. Saffarini ◽  
J. M. Saiter
Keyword(s):  
Heat Capacity ◽  
Chalcogenide Glasses ◽  
Composition Dependence ◽  
Heat Capacity Jump

Nanocomposites Based on Hyperbranched Polymers and Montmorillonite

2011 ◽  
Vol 108 ◽  
pp. 91-94 ◽  
Author(s):  
Shao Jian He ◽  
Jun Lin
Keyword(s):  
Heat Capacity ◽  
Glass Transition ◽  
Full Range ◽  
Hyperbranched Polymers ◽  
Xrd Analysis ◽  
Rigid Amorphous Fraction ◽  
Two Phase ◽  
Heat Capacity Jump ◽  
Silicate Layers ◽  
Rigid Amorphous

Nanocomposites based on hyperbranched polymers and sodium montmorillonite were prepared over the full range of compositions. The XRD analysis showed the full exfoliation of silicate layers at lower silicate content (up to 9.1 wt%). With the further increase of silicate loading, an intercalated structure was developed with a constant d-spacing due to the unique structure of hyperbranched polymers. The heat capacity jump at the glass transition of the nanocomposites was found to deviate from the two-phase model prediction, indicating the formation of a rigid amorphous fraction. The glass transition temperature and heat capacity jump behaviors suggested that the molecular mobility of hyperbranched polymers were restricted by the introduction of silicate layers. The mechanical properties of the nanocomposites were also investigated.

scholarly journals Composition dependence of physical and optical properties in Ge-As-S chalcogenide glasses

2016 ◽  
Vol 440 ◽  
pp. 38-42 ◽  
Author(s):  
Yan Yang ◽  
Zhiyong Yang ◽  
Pierre Lucas ◽  
Yuwei Wang ◽  
Zhijie Yang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chalcogenide Glasses ◽  
Composition Dependence

Temperature and Composition Dependence of Electrical Conductivity of Ge10 Se90-x Bix (x=0, 2, 4, 6, 8, 10) Chalcogenide Glasses

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Shiveom Srivastava ◽  
S. K. Srivastava ◽  
Krishna K. Srivastava ◽  
Narayan P. Srivastava
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Chalcogenide Glasses ◽  
Conduction Mechanism ◽  
Composition Dependence ◽  
Arrhenius Equation ◽  
Atomic Weight ◽  
Melt Quenching ◽  
Characteristic Curves ◽  
Glassy Systems

Electrical conductivity of Ge10 Se90-x Bix (x=0,2,4,6,8,10) glassy systems prepared by melt quenching technique has been studied at different temperature in bulk form through I-V characteristic curves. It has been observed that the electrical conductivity increases as the Bi concentration increases up to 4 atomic weight percentages and on further addition of Bi it reduces. The variation in electrical conductivity with Bi concentration is attributed to the Se-Bi bond concentration. Using the Arrhenius equation of conductivity, the activation energy of conduction is evaluated. The effect of Bi concentration on activation energy has also been studied. It is quite evident from results that Poole-Frankel and Rechardson-Schottky conduction mechanism hold good for conduction in these glasses.

Composition dependence of thermo-dynamical and thermo-mechanical properties in SeTeSnGe chalcogenide glasses (ChGs)

2020 ◽  
Vol 90 (3) ◽  
pp. 31101
Author(s):  
Shiv Kumar Pal ◽  
Neeraj Mehta ◽  
John C. MacDonald ◽  
Dipti Sharma
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Specific Heat ◽  
Molar Volume ◽  
Chalcogenide Glasses ◽  
Composition Dependence ◽  
Glass Transition Region ◽  
Scanning Calorimetry ◽  
Heat Value ◽  
Large Increment

In this endeavor, we have synthesized novel quaternary glassy Se78-xTe20Sn2Gex (0 ≤ x ≤ 6) alloys by the well-known rapid cooling of melt under quenching technique, to study the effect of Germanium on thermodynamic and thermo-mechanical properties. In particular, we employed Differential Scanning Calorimetry (DSC) technique for the investigation of thermodynamic parameters (e.g., specific heat Cp and enthalpy ΔH) in the glass-transition-region (GTR). Differential Scanning Calorimetry (DSC) experiment was run under non-isothermal conditions. The thermo-mechanical parameters i.e., micro-hardness, micro-void volume, the energy of creation of micro-void, elasticity, density, compactness, and molar volume are also calculated. It was observed that there is a large increment in Cp values in the GTR. Further analysis shows that the Cp values above the GTR (i.e., Cp  = Cpe equilibrium specific heat) and below the GTR (i.e., Cp  = Cpg glass specific heat) are vastly composition dependent. The increment in specific heat value after Ge incorporation is explained in terms of molar volume.

Calorimetric Studies of High Temperature Oxide Superconductors

1987 ◽  
Vol 99 ◽  
Author(s):  
Yasutoshi Saito ◽  
Tetsurõ Nakamura ◽  
Tooru Atake
Keyword(s):  
Heat Capacity ◽  
Adiabatic Calorimeter ◽  
Order Type ◽  
Heat Capacities ◽  
Oxide Superconductors ◽  
Heat Capacity Jump ◽  
Two Samples ◽  
Schottky Type ◽  
High Temperature Oxide ◽  
Calorimetric Studies

ABSTRACTThe heat capacities of single phase samples of Ba2DyCu3O7 and Ba2ErCu3O7 which were prepared by the method of powder-calcination have been measured over the temperature range 13–300 K by using a laboratory-made adiabatic calorimeter. A typical second-order type of anomaly was observed due to the superconducting phase transition at 92.5 K in Ba2DyCu3O7 and at 91.2 K in Ba2ErCu3O7. From the heat capacity jump at the transition temperature, the electronic heat capacity coefficient was estimated as 30 mJ·K-2.mol1 for Ba2ErCu3O7 and 32 mJ·K-2. mol-1 for Ba2ErCu3O7. Large differences were found in the low temperature heat capacities between the two samples, which were analyzed on the basis of Schottky-type of anomalies owing to the magnetic ions of Dy and Er.

Composition dependence of the physical and acousto-optic properties of transparent Ge–As–S chalcogenide glasses

2020 ◽  
Vol 108 ◽  
pp. 110175
Author(s):  
Shengjie Ding ◽  
Shixun Dai ◽  
Zhenfei Cao ◽  
Chengcheng Liu ◽  
Jinghui Wu
Keyword(s):  
Chalcogenide Glasses ◽  
Composition Dependence
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