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Showing papers in "Thermochimica Acta in 1981"


Journal ArticleDOI
TL;DR: In this paper, the Avrami-Erofeev type transformation was solved for isothermal as well as non-isothermal reactions and it was shown that the expressions commonly used to extract kinetic parameters from nonisothermal experiments are obtained via an incorrect procedure.

173 citations


Journal ArticleDOI
TL;DR: In this article, the controlled decomposition of various metal carbonates, carboxylates, oxalates, acetates, formates and hydroxides and their common hydrates was carried out in a thermogravimetric analyzer, a differential scanning calorimeter and a differential thermal analyzer.

135 citations


Journal ArticleDOI
TL;DR: An approach based on the graph theory has been evolved to predict molar excess enthalpies, HE, and VE for a number of binary mixtures of non-electrolytes as discussed by the authors.

114 citations


Journal ArticleDOI
TL;DR: In this article, the authors studied the thermal decomposition of Green River oil shale kerogen using non-isothermal thermogravimetry and showed that first-order kinetics are adequate in explaining the overall trends in the thermal behavior of green River oil shales.

92 citations


Journal ArticleDOI
P.K. Gallagher1, S.St.J. Warne1
TL;DR: In this article, the thermal decomposition of three siderites having markedly different purities was studied using thermogravimetry, evolved gas analysis, thermomagnetometry and X-ray diffraction analysis.

87 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of thermal decomposition of rice hulls on the amorphous structure of silica ash was investigated by X-ray diffraction, and the results obtained clarify the optimum conditions for production of amorphized silica by combustion of Rice hulls in fixed beds.

86 citations


Journal ArticleDOI
TL;DR: In this paper, the results indicate that a diffusion-controlled mechanism is involved in thermal dehydroxylation of Mg(OH)2, as published by Fong and Chen, are re-analyzed by these two methods.

72 citations


Journal ArticleDOI
TL;DR: The Arrhenius parameters of the thermal decomposition of pure di-t-butyl peroxide in toluene were measured to be E = 37.8 ± 1.1 and log A (sec−1) = 16.15 ± 0.61 from a series of accelerating rate calorimetric experiments covering a broad range of thermal inertia as discussed by the authors.

63 citations


Journal ArticleDOI
TL;DR: In this paper, the plausibility of the Avrami-Erofeyev mechanism in the thermal dehydration of CaC 2 O 4 · H 2 O is discussed.

59 citations


Journal ArticleDOI
TL;DR: In this paper, the enthalphy of mixing of some intermediate phases in the systems FeTi, CoTi, and NiTi have been measured by direct reaction calorimetry between 1200 and 1500 K. The results are given and compared with available data from diagram estimations and from earlier experimental work.

58 citations


Journal ArticleDOI
TL;DR: In this paper, the rate of decomposition for two widely used glass and asbestos-phenolic ablative materials were measured using standard thermogravimetric techniques, and the average activation energy values determined by the two methods agreed within 4.6% for both materials.

Journal ArticleDOI
TL;DR: In this article, a review of the application of thermal methods of analysis, viz. differential thermal analysis (DTA), differential scanning calorimetry, thermogravimetry (TG), derivative TG (DTG), dilatometry (DT) and penetrometry (TMA), for the investigation of petroleum products (fuel and lubricating oils, greases, paraffin waxes, petrolatums and asphalts).


Journal ArticleDOI
TL;DR: In this article, two modified forms of the NRTL equation proposed by Renon are presented by substituting local surface fractions for local mole fractions and further by including Guggenheim's combinatorial entropy for athermal mixtures whose molecules differ in size and shape.


Journal ArticleDOI
TL;DR: In this article, the thermal decomposition of ammonium heptamolybdate has been investigated, making use of additional information obtained from isothermal studies, X-ray and IR measurements.

Journal ArticleDOI
TL;DR: In this paper, the use of differential thermal analysis (DTA) to follow the pyrolysis of cellulose in air products two and sometimes three exothermic peaks was shown.

Journal ArticleDOI
TL;DR: In this article, a study of the range of thermal stability and phase transitions in the following oxides of antimony: orthorhombic and cubic Sb2O3, orthorHombic Sb 2O4 and cubicSb 2 O5, is presented.

Journal ArticleDOI
TL;DR: In this article, a relationship was found and discussed between the values ln K≠ and ln D, where D is a detonation velocity at maximum theoretical density of the above-mentioned compounds.

Journal ArticleDOI
TL;DR: In this paper, the thermodynamic parameters of hexachloroplumbates have been evaluated using differential thermal analysis (DTA) and thermogravimetry (TG) with a derivatograph.

Journal ArticleDOI
TL;DR: In this paper, the excess enthalpies of binary systems of acetonitrile, chloroform-acetone, and chlorosform-benzene were analyzed with thermodynamic association theory for complex ternary liquid mixtures.

Journal ArticleDOI
TL;DR: In this article, it is demonstrated how to obtain the temperature and weight/length curves from quasi-isothermal thermogravimetric and dilatometric studies of thermal decompositions.

Journal ArticleDOI
TL;DR: In this paper, the effect of temperature of firing and time of annealing on crystallite size of silica obtained by burning boiled rice husk was studied by the X-ray broadening technique.

Journal ArticleDOI
TL;DR: In this article, it was shown that the method of Benson's group permitted the estimation of the enthalpies of vaporisation for organic monofunctional compounds, including molecules of the type R 1 -X-R 2 with X = O, S, CO and primary, secondary and tertiary amines.

Journal ArticleDOI
TL;DR: The detection limit of iron, expressed as wt.% FeCO 3 component in the dolomite structure, is of the order of 1%. The presence of Fe in the mineral siderite may be clearly distinguished from the Fe present as ferroan dolomerite/ankerite.

Journal ArticleDOI
TL;DR: In this paper, the authors derived the equilibrium constants Kc, Km, or Kx Equations for differences between ΔG°c, ΔGg°m, and ΔG g°x values.

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a simpler and more adequate form for the description of reaction kinetics under linear temperature increase conditions, where the dependence of reaction rates on temperature and progress of the reaction is assumed to be an Arrhenius-type equation.

Journal ArticleDOI
TL;DR: In this article, the authors used a flow microcalorimeter and pulse-echo-overlap equipment to measure the thermal capacity of water + ethanenitrile mixtures over the entire mole fraction range.

Journal ArticleDOI
TL;DR: In this article, the authors studied the non-isothermal devitrification of Na2O · 2 CaO · 3 SiO2 glass by differential thermal analysis in order to evaluate, from DTA curves, the temperature of maximum nucleation rate, Tm, and the activation energy values, Ec, for crystal growth.

Journal ArticleDOI
TL;DR: In this paper, the enthalpies of combustion in the condensed state of L -cysteine and L -methionine have been determined using an isoperibol calorimeter equipped with a rotating bomb.