THE Edinburgh discussion of the Faraday Society on September 24-26 on the subject of “The Structure of Liquids and Solutions” was a particularly successful and satisfactory conference. The choice of subject had been very happily timed. The theory of the structure of liquids, which has been in recent years approached from a number of different angles, appears now to have reached a stage in which a larger synthesis is possible, and the bringing together in Edinburgh of many of those who have most notably contributed to these theories has markedly helped towards such a synthesis.

Structure of Liquids

Influence of Bi content on linear and nonlinear optical properties of As40Se60-xBix chalcogenide thin films

Dielectric relaxation and AC conductivity studies of Se90Cd10−xInx glassy alloys

The non-isothermal TG/DSC technique has been used to study the kinetic triplet of ignition reaction of Mg/NaNO3 pyrotechnic under nitrogen atmosphere at different heating rates (5, 10, 15, and 20 °C min−1). The TG/DSC results showed that the mass gain after ignition increased and the heat of ignition reaction decreased with increasing heating rate, indicating that the reaction between Mg and NaNO3 was not complete during the ignition process. The activation energy (Ea) was calculated using Starink model-free method. The pre-exponential factor (A) and kinetic model function were determined by means of the compensation effect and the selected model was confirmed by the nonlinear model fitting method. The average values of Ea and logA for the ignition reaction of Mg/NaNO3 were found to be 148.46 ± 3.37 kJ mol−1 and 10.04 min−1, respectively. The model fitting method proved that the ignition reaction of Mg/NaNO3 pyrotechnic follows the mechanism of A4 (g(α) = [−ln(1−α)]1/4) as a nucleation reaction model.

Kinetic study of ignition of Mg/NaNO 3 pyrotechnic using non-isothermal TG/DSC technique

Non-isothermal crystallization kinetics of ternary Se90Te10−xPbx glasses

Effect of Pb addition on dielectric relaxation in Se80In20 glassy system

Thermal and mechanical properties of CNT-Se90−xTe10Agx (x = 0, 5 and 10) glassy composites

The crystallization kinetics of bulk Se80In20−xPbx (x=0, 5, 10 and 15) chalcogenide glasses have been studied using a differential scanning calorimeter (DSC) with different heating rates (5, 10, 15 and 20 K/min) under non-isothermal conditions. Various kinetic parameters of crystallization, such as crystallization temperature Tc, peak crystallization temperature Tp, activation energy for crystallization Ec and order parameters n, m have been determined to study nucleation and growth during crystallization. The reaction rate constant K and pre-exponential factor K0 also have been determined. The composition dependence of these parameters may be explained on the basis of modification of chemical bonds present in the Se–In system due to addition of Pb content.

Effect of Pb additive on crystallization kinetics of Se80In20 glassy matrix

Glass-transition kinetics of $$\mathrm{Se}_{80}\mathrm{In}_{20-\mathrm{x}}\mathrm{Pb}_{\mathrm{x}}$$
 (
 $$x =$$
 0, 5, 10, and 15) chalcogenide glasses have been carried out at different heating rates by using differential scanning calorimeter (DSC) under the non-isothermal condition. The glass-transition temperature $$T_{\mathrm{g}}$$
 and peak glass-transition temperature $$T_{\mathrm{pg}}$$
 have been determined from DSC thermograms. The reduced glass temperature $$T_{\mathrm{rg}}$$
 , total relaxation time $$\tau _{T_{g}}$$
 thermal-stability parameters $$K^{l}$$
 and $$S$$
 , the activation energy of glass transition $$E_{\mathrm{g}}$$
 , the fragility index $$F_{\mathrm{i}}$$
 , and the average coordination number $$\langle Z\rangle $$
 have been calculated on the basis of the experimental results. The temperature differences $$(T_{\mathrm{c}}-T_{\mathrm{g}}), K_{\mathrm{gl}}, K^{l}, S$$
 , and $$E_{\mathrm{g}}$$
 are found to be maxima for $$\mathrm{Se}_{80}\mathrm{In}_{10}\mathrm{Pb}_{10}$$
 glass. This indicates that $$\mathrm{Se}_{80}\mathrm{In}_{10}\mathrm{Pb}_{10}$$
 glass has the highest thermal stability and glass-forming ability in the investigated compositional range. These results could be explained on the basis of modification of the chemical bond formation due to incorporation of Pb in the Se–In glassy matrix.

Study of Glass-Transition Kinetics of Pb-Modified Se$$_{}$$In$$_{20}$$20 System by Using Non-isothermal Differential Scanning Calorimetry

The crystallization kinetics of Se80In10Pb10 chalcogenide glass is studied using differential scanning calorimeter (DSC) at
different heating rates (5, 10, 15 and 20 K/min) under non-isothermal
conditions. Four iso-conversional methods (Kissinger-Akahira-Sunose,
Flynn-Wall-Ozawa, Tang and Straink) were used to determine various kinetic
parameters: crystallization temperature (Tα),
activation energy of crystallization (Eα),
Avrami exponent (nα) in
non-isothermal mode. The transformation from amorphous to crystalline phase in
Se80In10Pb10 is considered as a single step
reaction mechanism.

/pdf/study-of-crystallization-process-in-se-80-in-10-pb-10-by-iso-4q6yhasvkr.pdf

Study of Crystallization Process in Se 80 In 10 Pb 10 by Iso-Conversional Methods

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