Showing papers in "Thermochimica Acta in 1980"

TL;DR: In this paper, an accelerating rate calorimeter was developed for thermal hazard evaluation to provide time-temperature pressure data for chemical reactions taking place under adiabatic conditions.

TL;DR: In this article, the surface and bulk crystallization of Li2O · 2 SiO2 glass has been studied by differential thermal analysis and the influence of the specific surface area of the sample and the nucleation heat treatment on the crystallization kinetics is pointed out.

TL;DR: The thermal behavior of NaAlH4 and Na3AlH6 has been studied by means of thermogravimetry and differential scanning calorimetry in the range 298-600 K as discussed by the authors.

TL;DR: In this article, a linear relationship between the variables log A and E was established, which is known as a compensation effect, expressed by the following equation, where w is the weight or mass of pyrolyzing sample at any time t; A is the frequency factor; E is the activation energy; Q is the reaction order, and k is the rate constant.

TL;DR: In this article, the enthalpies of formation of the following classes of organic compounds in the liquid phase: alkanes, cycloalkanes, alkenes, chloro-and bromoalkane, alcohols, acids, aldehydes, esters, nitriles, aromatic hydrocarbons, and mercaptans.

TL;DR: In this article, the binary phase diagram of NaNO3 and KNO3 was studied using differential scanning calorimetry (DSC) and the data more precisely defined the solidus and liquidus of an earlier phase diagram for this system.

TL;DR: In this paper, the authors compared the rate of conversion vs. temperature at constant heating rate for first-order reactions with activation energies of 80, 160, 240 and 320 kJ mole−1 over a range of heating rates from 10−9 to 105 K s−1.

TL;DR: In this paper, the IR spectroscopy of rice-husk white ash silica was performed at temperatures between 500 and 1400°C and the results obtained were compared with those of silica gel.

TL;DR: In this paper, the thermal stabilities of 37 polynitroaromatic compounds are specified by means of non-isothermal DTA, and the initial temperatures of the exotherms TD, as well as the Piloyan decomposition activation energies, E, of the compounds are determined.

TL;DR: In this paper, a time-of-flight mass spectrometer is used to monitor the thermal decomposition of solid samples placed in the ion source region, which yields direct insight into the decomposition mechanism as well as values for kinetic parameters.

TL;DR: In this paper, it is suggested that the tendency for the apparent activation energy to increase, as the temperature is raised, is due to a change in the relative importance of the different reactions which lead to weight loss in this system.

TL;DR: Differential scanning calorimetery demonstrated the occurrence of exothermic processes associated with the production of volatile matter in or near the plastic region of the coal samples studied.

TL;DR: In this paper, the surface properties of the silica obtained at each firing temperature were derived, related to the pore structure and the degree of crystallinity of the samples, and X-Ray diffraction analysis was also used for the identification of the phase produced by thermal treatment of rice-husk ash.

TL;DR: In this paper, a general mechanism for solid state reactions of coordination compounds is proposed, in which the generations of a point defect is considered as the formation of the transition state, and three types of point defects are considered which may apply in different types of reactions.

TL;DR: In this paper, the ferromagnetic Curie temperature, Tc, is measured by differential scanning calorimetry (DSC), which is convenient and accurate if temperature lags are corrected for.

TL;DR: In this paper, the binary parameters of the Zeta and effective Zeta equations were evaluated from equilibrium data for binary pairs and the parameters obtained were used to predict the ternary liquid-liquid equilibrium data.

TL;DR: In this paper, a comparative study has been made on the reactions of RE oxides (RE = Y, La, Gd and Lu) with ammonium bromide, and of yttrium oxide (Y = F, Cl, Br and I) at different temperatures.

TL;DR: In this paper, the structural and surface area changes of ammonium metavanadate are studied by X-ray diffraction and N 2 adsorption and three exotherms also appear and explanations for their presence are given.

TL;DR: In this article, the vapour pressures of cytosine and thymine were measured using the torsion-effusion technique and the standard sublimation enthalpies were obtained by second-and third-law treatment of the experimental data.

TL;DR: In this article, the thermal decomposition of CaCO3 was studied under high vacuum by means of both TG and the more recently developed constant decomposition rate thermal analysis (CRTA) which allows the monitoring of both reaction rate and the residual pressure over the sample.

TL;DR: In this paper, the molar ATP turnover was analyzed for both aerobic and fermentative catabolism characteristic of organisms ranging from bacteria to higher animals including man, and it was shown that the caloric equivalent of disspative ATP-turnover under nongrowing conditions, cdωATP varies from 76 to 83 kJ.

TL;DR: In this article, it was shown by gravimetric measurements that caffeine hydrate does not exist as a monohydrate but has a water content corresponding to a 5 6 or 4 5 hydrate.

TL;DR: In this paper, the vapour pressure of uracil was measured in the temperature range 452-587 K using different techniques and the pressure equation log P (kPa) = 12.13 ± 0.50 − (6823 ± 210)/ T was derived.

TL;DR: In this paper, the kinetics and mechanism of zinc ferrite formation were studied for pure oxide mixtures at temperatures up to 1000°C by X-ray analysis, DTA and chemical analysis.

TL;DR: In this article, both thermogravimetric analysis (TG) and constant rate thermal analysis (CRTA) were applied to the study of the mechanism of thermal decomposition of alkaline-earth carbonates proper experimental conditions were used in order to avoid heat and mass transfer phenomena.

TL;DR: In this article, thermogravimetry (TG) and mass spectrometry (MS) are combined to provide precise heating conditions and weight loss information and MS identifies volatiles evolved during the weight loss process.

TL;DR: In this article, the kinetic parameters (energy of activation, E, and preexponential factor, A ) from non-isothermal TG data have been correlated, for the first time, with simultaneous variations of both the procedural factors (heating rate and sample mass) by multiple regression analysis.