Showing papers in "Thermochimica Acta in 1975"

TL;DR: In this article, the performance of an LKB flow microcalorimeter has been improved through changes in the auxiliary equipment and operating technique, and measurements of excess enthalpies, precise to 0.5% or better, are reported for several test systems.

TL;DR: In this article, the heat of immersion of natural magnetite in aqueous solutions has been determined by the isothermal differential microcalorimeter (ΔHi = −646±25 erg cm−2).

TL;DR: In this article, a method for the experimental determination of critical temperatures on a routine basis is presented for most common explosives, and it is shown that agreement between calculated and experimental values is excellent.

TL;DR: In this paper, the oxidation behavior of palladium, ruthenium and iridium powders of different grain sizes was investigated by TG, DTA and X-ray methods.

TL;DR: In this article, the partial molal volumes of both components of the mixed system have been calculated and deviations from ideal volumes of mixing have been evaluated; structural correlations have been made with previous results on acid-base properties; they allow to distinguish several interaction regions between components of binary systems.

TL;DR: In this paper, the mechanism of decomposition of metal sulphates is discussed, making use of additional information obtained from isothermal studies and X-ray diffraction measurements, and the activation energies of these reactions were calculated and found to increase, with almost the same increments, in the order Zn

TL;DR: In this paper, the authors show that compounds of the type (n-C n H 2n+1 NH 3 ) 2 MCl 4 with n = 12 or n = 16 and with M = Mn, Cu, Co, Fe, Hg, Zn show order-disorder solid-solid phase transitions in the temperature range 300-380 K.

TL;DR: In this paper, the authors show that random nucleation occurs, producing perfectly oriented but disordered γ-Fe 2 O 3 crystals of about 70 A size, which can be accomodated with an atomistic model of lattice collapse.

TL;DR: In this paper, a computer programm is given, which permits the determination of the more probable reaction mechanism by use of 17 different kinetic equations, including chemical reaction, nucleation, phase boundary reaction and diffusion.

TL;DR: In this paper, seven copper(II) dithiocarbamate complexes [Cu(R 2 Dtc) 2 : R 2 = Me 2, Et 2, nPr 2, nBu 2, cycHex 2, Et Ph, pyrrol and pip] have been prepared and examined by thermogravimetric analysis (TG).

TL;DR: In this article, a recently described method is used to characterise thermal gradients in a DSC-2 and the results are compared with a conventional temperature calibration, under certain circumstances the latter may be in error by several degrees with consequent adverse effects on calculated heat capacities.

TL;DR: In this article, the accuracy of a simple, well-known approximation to the solution of the adiabatic explosion problem is examined, and it is shown that, with a minor modification, the approximation can be converted to a form accurate to 1% or better for a wide range of the input parameters.

TL;DR: In this paper, the breakdown of the supercooling of drops of liquids dispersed in an emulsifying medium has been measured by differential scanning calorimetry (DSC), and the limits of the validity of the methods exposed have also been indicated.

TL;DR: In this paper, the authors investigated the thermal decomposition of strontium titanyl oxalate tetrahydrate (SITO) and calcium titanyl Oxalate hexahydrate using TG, DTA, gas and chemical analysis.

TL;DR: In this article, the solid-state thermal dissociation reactions of the complexes of all the lanthanide(III) nitrates and thiocyanates (except Pm) with the cyclic polyether dibenzo-18-crown-6 were investigated.

TL;DR: In this article, the enthalpies of formation of solid Fe-Ga and Co-Ga solutions were determined using solution calorimetric methods involving a BrBrH mixture as the solvent.

TL;DR: The thermal decomposition of pure ammonium perchlorate (AP) was investigated in various gaseous atmospheres at pressures up to 51 atm, using a technique of thermal analysis as mentioned in this paper.

TL;DR: In this article, the enthalpies of formation of solid nickel-gallium alloys were determined by solution calorimetry using liquid tin as the solvent and the free energies of formation have been determined from EMF-measurements using galvanic cells containing solid electrolytes which were oxygen-ion conducting.

TL;DR: In this article, the thermal properties of the complexes of cinchomeronic and dinicotinic acid with several divalent metal ions were determined by thermogravimetry (TG) and differential thermal analysis (DTA).

TL;DR: The thermal behavior of compounds of the type (n-C n H 2n+1 NH 3 ) 2 CoCl 4 with n = 9, 10 ⋯ 17 is investigated by means of differential scanning calorimetry in the temperature range 280-470 K as discussed by the authors.

TL;DR: In this paper, various analytical methods of non-isothermal kinetics have been applied to DSC curves to determine the kinetic parameters ruling the lattice reorganization (primary recrystallization) of prestrained pure copper.

TL;DR: In this article, a fresh outcrop of silicified limestones at the Burgenstock (Switzerland) contained palygorskite, which showed an alteration in the unit cell dimensions.

TL;DR: In this paper, the heats of formation were measured using a direct isoperibol calorimeter and the composition and equilibrium state of the samples have been checked by chemical, metallographic and X-ray analyses.

TL;DR: The first-order kinetics of the dehydroxylation of talc have been measured in the temperature interval 1100-1160 K by means of isothermal weight-change determinations as mentioned in this paper.

TL;DR: In this paper, a study of the thermal decomposition of intimate mixtures of different molar ratios of KClO4 and chromium(III) oxide was conducted employing thermogravimetry, differential thermal analysis, chemical analysis, infrared spectroscopy and X-ray diffraction analysis.

TL;DR: In this article, thermal dissociation reactions of lanthanide(III) nitrates and thiocyanates solid complexes of the cyclic polyether benzo-15crown-5 were studied in dynamic atmosphere of dry nitrogen and under reduced pressure.

TL;DR: In this paper, the decomposition of hydrated selenates of manganese, cobalt, nickel, copper(II), zinc and cadmium has been studied using different methods.

TL;DR: Using differential scanning calorimetry (DSC) in combination with effluent analysis, differential thermal analysis (DTA), thermogravimetric analysis (TG) and X-ray analysis, the dehydration of ZnSO 4 ·7H 2 O and NiSO 4 −6H 2O was investigated and a few transition enthalpies were measured as discussed by the authors.