Showing papers in "Thermochimica Acta in 1984"

TL;DR: In this paper, the thermal decomposition of sixteen metal sulfates was studied by thermogravimetry at heating rates of 2 and 5°C min −1 in flowing air and high-purity nitrogen.

TL;DR: In this paper, a new explanation for the double DTA-peak often observed with pure and Alsubstituted goethites was proposed based on the crystallographic relationship between goethite and hematite.

TL;DR: In this article, a literature review is presented concerning the application of thermoanalytical methods, such as differential thermal analysis (DTA), thermogravimetry (TG) and derivative TG (DTG), as well as isothermal measurements for the examination of the thermal decomposition of talc.

TL;DR: In this paper, a linear relationship between the activation energies of the initial stage of non-autocatalysed, low-temperature thermolysis and the heats of explosion of organic polynitro compounds is presented.

TL;DR: In this article, the phase diagram was investigated using differential thermal analysis, differential scanning calorimetry, thermogravimetric, powder X-ray diffraction and metallographic techniques.

TL;DR: In this paper, the effect of magnesium salt on the morphological development of MgO powders synthesized by the evaporative decomposition of solutions (EDS) technique is presented.

TL;DR: In this article, combined thermal analysis was used to establish the dissociation steps for the hydrated oxalates of calcium and magnesium, and the results showed that the activation energy and the preexponential factor vary with temperature over wide ranges.

TL;DR: In this paper, four mixtures were prepared of weight ratios 80:20, 70:30, 60:40 and 50:50 of china kaolin/pure Ca(OH) 2, each mix was activated for 2 h at 800°C and then paste hydrated at room temperature and 100% RH for up to 28 days.

TL;DR: In this paper, the thermal decomposition of 24 compounds, all identified as potential replacements for tetrazene in stab and percussion mixes, has been studied by non-isothermal differential scanning calorimetry, and the physicochemical parameters which characterise these explosive reactions have been determined and compared with data from temperature of ignition measurements.

TL;DR: In this article, a linear relationship between procedural activation energy and heat of reaction is developed, which is typical of elementary reactions of atoms and small radicals, and the effects of alkali metal salts on the decomposition of coal under three gas atmospheres (N,. CO, and air) are investigated.

TL;DR: In this article, an aneroid isoperibolic microcalorimeter was used to measure the heat of combustion of polycyclic small ring compounds using an oxygen-bomb combustion calorimetry, with the following results: Δ H 0 c (1) 1a = −1431.6 (± 1.2) kcal mol −1 ; Δ H0 c (c) 1b = −1263.1(± 0.9) kcal m

TL;DR: The adsorption of CH4 on H-ZSM-5 zeolite has been investigated by microbalance technique, ir-spectroscopy and calorimetry as mentioned in this paper.

TL;DR: The phase transformation of gamma to alpha alumina was studied with high temperature DTA in this paper, and the results were analysed with the methods of Borchardt and Daniels, Freeman and Carroll, Coats and Redfern and Kissinger.

TL;DR: In this article, the versatility of a differential scanning calorimetry (DSC) cell in studying thermal and/or thermal-oxidative degradation of lubricants is shown using ester based aviation turbine oils as an example.

TL;DR: In this article, an isothermal flow calorimeter suitable for measuring either endothermic or exothermic heats of mixing from 373 to 673 K and from 0.1 to 40.5 MPa is described.

TL;DR: In this paper, the dl and l -forms of α-amino-n -butyric acid (1,2), serine ( 3,4), cysteine ( 5,6), norvaline ( 7,8), valine ( 9,10), threonine ( 11,12), norleucine ( 13,14), leucine( 15,16), isoleucine, and cystine ( 20,21 ) showed nine solid-state phase transitions between 233 and 423 K by DSC-analysis.

TL;DR: In this paper, the characterization of solid-solid phase transitions by adiabatic calorimetry and differential scanning (DSC) was compared for the compound (n -C 18 H 37 NH 3 ) 2 CdCl 4.

TL;DR: In this article, a detailed overview of the possibilities thermal analysis and in particular thermogravimetry has in studying low-temperature oxidation of coal is given, along with procedures with which representative samples of coal can be obtained.

TL;DR: In this article, the thermal decomposition of NiAl 2 O 4 was studied by X-ray diffraction at temperatures above 600°C and the corresponding spinel was formed by interaction between both oxides at temperatures higher than 1000°C.

TL;DR: In this paper, the degree of conversion in the rate equation is used to describe non-isothermal reaction kinetics, and the existence of the total differential of α = f( t, T ) is discussed.

TL;DR: In this article, the authors present a method for thermique gazeuse par spectrometrie de masse, which can be used in a wide range of applications, e.g. this article.

TL;DR: In this paper, the effect of pretreating rice hulls (addition of iron) on the amount of volatile matter and residual carbon present after the coking process was studied.

TL;DR: In this paper, a temperature-bonding energy study indicates that rate of bonding is controlled by adsorption rather than diffusion to the aggregate surface or interphase region, which is related to highway performance.

TL;DR: In this article, effective invariant kinetic characteristics in non-isothermal kinetics are developed, its connection with general methods for describing multiparametric dependencies and improving the unambiguity of inverse problem solution as well as with the main initial nonisothermal equation of kinetics is discussed.

TL;DR: The uses of mass spectrometric evolved gas analysis systems have been described and discussed in relation to solid state reactions giving rise to gaseous products as discussed by the authors, where emphasis has been placed on the use of such systems for kinetic studies.

TL;DR: In this paper, the title compound was prepared in high purity by reducing 3,3-dibromo-2,2,4,4-tetra-methylpentane with magnesium in the last step.

TL;DR: In this article, the work done on thermal studies of metal dithiocarbamato complexes during the period 1969-1982 is given. But the work in this paper is restricted to the case of metal DithiOCBAMato complexes.

TL;DR: In this article, a decomposition mechanism was proposed which is consistent with the observed intensity changes in the X-ray pattern of the azurite-like intermediate phase, and the product formed in the first stage of the decomposition is a mixture of tenorite (CuO) and material with Xray characteristics similar to Azurite, ruling out reaction sequences involving malachite or CuCO 3.