Showing papers in "Thermochimica Acta in 1973"

TL;DR: In this paper, isothermal and dynamic methods were used to study the rate of weight loss of CaCO3 and a pronounced dependence of the activation enthalpy, pre-exponential term, and rate constant upon sample weight and heating rate was observed.

TL;DR: In this paper, the empirically derived universal Hugoniot curve for liquids was modified to satisfy boundary conditions in the initial state at 1 bar, and the modification improved the description of liquids for pressures up to 20 kbar.

TL;DR: In this article, the temperature, enthalpy, entropy of melting and crystal transitions of 21 polycyclic aromatic hydrocarbons, containing from 2 to 6 unsubstituted condensed rings, were determined by differential scanning calorimetry.

TL;DR: In this paper, the authors determined the heat of combustion of seven nitramines by means of differential scanning calorimetry (DSC) measurement from which standard enthalpies of formation could be derived.

TL;DR: In this article, a dynamic differential calorimetry has been employed to evaluate the heats of formation, heats and entropies of fusion of RESn 2 compounds, where rate earths (RE) La, Ce, Pr, Nd, Sm, Gd, Eu, Yb and Ca.

TL;DR: In this paper, a dynamic differential calorimetry has been employed to evaluate the heat of formation, entropies and fusion of REPb3 compounds, where the results obtained have been estimated to be correct to within ±5-6

TL;DR: The theory, operation and instrumentation of differential thermal analysis (DTA) and differential scanning calorimetry (DSC) are sufficiently well developed to determine melting and boiling points with a high degree of certainty and reproducibility as mentioned in this paper.

TL;DR: A thermal analysis-mass spectrometer system controlled by a computer has been developed and successfully used in the analysis of a wide variety of geochemical samples as mentioned in this paper, which provides a very powerful analytical tool for the determination of volatile species released from samples over a very wide temperature and sample-size range.

TL;DR: In this paper, values of the temperature integral (i) of the Arrhenius equation have been calculated and an approximately linear relationship has been established between log i and the activation energy and between log ii and the reciprocal temperature.

TL;DR: In this paper, the reaction kinetics of thermal condensations of phthalic acid, dl-vahne, Dl-alanine and l -phenylalanine with phthalamic acid are studied; activation energy of the reactions occurring in the investigated systems is determined.

TL;DR: In this article, the enthalpies of four substances, namely, Cu 2 Te, CuTe, Ag 2 Te and Ag 1.64 Te, were measured for the temperature range (280-8OO K) using differential scanning calorimetry.

TL;DR: In this article, the thermal decomposition of a turbostratic nickel hydroxide was studied by means of DTA, TGA and isothermal analysis, and it was found that removal of intercalary water takes place simultaneously with the removal of hydroxyl groups at a temperature not very different from the dehydration temperature of Ni(OH) 2.

TL;DR: In this article, eleven palladium(II) alkylxanthates have been prepared and their thermal properties investigated by thermogravimetric analysis and a thermal decomposition mechanism is proposed.

TL;DR: The ternary reciprocal sytem LiFNaF, NaF+AlF3-6, AlF3 and F-3 has been investigated by thermal analysis, differential thermal analysis and quenching.

TL;DR: In this paper, the results of a comprehensive thermogravimetric and calorimetric analysis of netel complexes of various alkyI derivatives of xanthic acid and dithiocarbamic acid were reported.

TL;DR: In this article, the crosslink reaction in a two component methyl silicone rubber has been studied by thermomechanical analysis (TMA) and differential scanning calorimetry (DSC).

TL;DR: Differential thermal analysis was used to detect the onset and extent of the catalytic oxidation of 1% hexane and to a lesser extent 3% CO in air as discussed by the authors, where unsupported catalysts as ground single crystals and in polycrystaline form were selected principally from the system La1−xMxMnO3 where M = Pb.

TL;DR: The Δ H ion of the process 2H2Ox → H3O+x + OH -x has been calorimetrically measured in dimethylsulfoxide (DMSO) water solutions for XDMSO molar ratios ranging between 0 and 0.8 at T = 25°C.

TL;DR: In this paper, an areal method for the estimation of kinetic parameters during polymer pyrolyses was extended for the assessment of compatibility of various polymers with highly energetic materials by DTA.

TL;DR: In this paper, the thermodynamic parameters for the complexation reaction of leucine, valine, proline and hydroxyproline with cerium(III), and yttrium(III) were determined potentiometrical1y in aqueous solution at 25, 35 °C and μ=0.1.

TL;DR: In this paper, the stoichiometry of coordination polymers formed by trithiocyanuric acid with some metals in both dimethyl formamide and aqueous solution is investigated.

TL;DR: In this paper, a highly sensitive simultaneous electrical conductivity and differential thermal analysis apparatus is described, which can simultaneously record both the electrical conductivities and differential analysis curves of a sample under the same conditions of furnace heating rate and atmosphere.

TL;DR: In this paper, the Sestak-Berggren equation was applied to the dehydration of Mn(HCO2)2· 2H2O as studied by differential scanning calorimetry.

TL;DR: In this article, the thermal behavior of barium trioxalatoaluminate in carbon dioxide and nitrogen atmospheres was investigated using thermogravimetry, differential thermal analysis, differential scanning calorimetry and high temperature X-ray diffraction.

TL;DR: In this article, it was shown that the concept of crystal lattice becomes meaningless at such small dimensions and that topochemical reactions may lead to products that are difficult to obtain in equilibrium systems.

TL;DR: In this article, the electrical conductivity and differential thermal analysis (DTA) curves of MnHgI4 complexes (M = Ag1+, Cu1+, Hg22+, Tl1+ and Pb2+) and HgI2 and AgI are reported.