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Showing papers in "Thermochimica Acta in 1974"



Journal ArticleDOI
TL;DR: In this paper, the formation of SO3 from SO2 and 02 is catalyzed by iron oxide in the fly ash from a coal-fired boiler, and the amount of produced SO3 is dependent on the iron oxide content of the fly-ash and on the oxygen concentration of the gas stream.

88 citations


Journal ArticleDOI
TL;DR: In this article, simple theory and techniques are explored and developed to utilize the dif-ferential scanning calorimeter for the determination of heat capacities, glass transition and enthalpies of transition between two thermodynamic states of substances.

79 citations


Journal ArticleDOI
TL;DR: Several lanthanide salts of trifluoroacetic and pentafluoropropionic acid have been prepared and characterized as discussed by the authors, and the volatile decomposition products were identified by IR analysis.

64 citations


Journal ArticleDOI
TL;DR: In this paper, the heats of aromatic hydrocarbons are correlated with an incremental 5-term scheme that includes CH and CC bond energy terms, resonance energies, and two steric parameters, and regression analysis of the experimental data with respect to the proposed parameters gives reasonable values for each term.

62 citations


Journal ArticleDOI
TL;DR: In this article, an aneroid isoperibol calorimetric apparatus is described which is particularly suitable for measurement of the reaction heat among solids and allows to carry out differential measurements.

58 citations


Journal ArticleDOI
TL;DR: In this article, two new salts of malonic acid have been prepared: the copper (II) malonate tetrahydrate and the copper(II)-ammonium double malonates.

53 citations


Journal ArticleDOI
TL;DR: In this article, the authors used dynamic differential calorimetry to evaluate the heat of formation, entropies and fusion of REIn 3 and RETl 3 compounds, and the results obtained have been estimated to within ±5-6%.

51 citations


Journal ArticleDOI
TL;DR: In this paper, the ideal gas chemical thermodynamic properties for NO, NO 2, N 2 O 3, and N 2O 4 for the temperature range 50 to 5000 K were evaluated by the statistical thermodynamic method using the most recent molecular parameters.

41 citations


Journal ArticleDOI
TL;DR: In this article, the decomposition characteristics of Pt(II) and Pt(IV) complexes in hydrogen, air and argon were investigated by thermal gravimetric and differential thermal analysis.

39 citations


Journal ArticleDOI
TL;DR: Differential scanning calorimetry has been applied to a study of elemental sulphur in this paper, where the thermal curves have been interpreted on the basis of allotropic conversions and melting points.

Journal ArticleDOI
TL;DR: In this paper, the authors measured the heat of formation of Nd/Bi alloys using an isoperibol direct calorimeter and obtained the following values (kcal/g-at): Nd 3 Bi, −15.0±0.7; Nd 5 Bi 3, −22.2± 0.7.

Journal ArticleDOI
TL;DR: In this paper, the authors used precipitation and solution calorimetry techniques to measure the heats of formation of six IIIB-VB semiconductor compounds and examined the validity of published theoretical estimates of the heats.

Journal ArticleDOI
TL;DR: In this article, a scanning microcalorimeter for the measurement of energies of transition in solution is described, which utilizes semi-conductor thermoelectric modules and is of a very simple and inexpensive construction.

Journal ArticleDOI
TL;DR: In this paper, the solid phase heat capacities of a number of hydrocarbon containing salts have been determined in the temperature range 273 to 373 K using a differential scanning calorimeter.

Journal ArticleDOI
TL;DR: In this paper, the design and operation of a simple direct-reaction calorimeter, suitable for the study of highly exothermic reactions, is described, and experimental data for the heats of formation of ScSb, YSb and LuSb are reported.

Journal ArticleDOI
TL;DR: In the LaBi system, the formation heats were measured using a direct isoperibol calorimeter as discussed by the authors, and the following values were found: 1.1.

Journal ArticleDOI
TL;DR: In the Y-Bi system the formation heats were measured using a direct isoperibol calorimeter as discussed by the authors, and the following values were found for the two known compounds:

Journal ArticleDOI
TL;DR: In this article, the TG and DTA curves of the yellow and red forms of HgO and other halides are reported, and a lower initial procedural dissociation temperature, 400°C, was observed for the yellow form of hgO versus 460°C for the red form.

Journal ArticleDOI
TL;DR: In this paper, a two-stage thermal decomposition of Cadmium thiourea reinickate is described and the DTG peak temperatures are 291 and 469°C and the corresponding DTA temperatures are 255 and 490°C.

Journal ArticleDOI
TL;DR: The reaction of ten oxyanions and oxides acting as Lux-Flood acids have been studied in both lithium nitrate and sodium nitrate eutectics and the stoichiometries of the reactions established as discussed by the authors.


Journal ArticleDOI
TL;DR: In this paper, the effects of sampling rate and interval on the measurement of the temperature resolution of thermistors in a d.c. Wheatstone bridge have been evaluated, and the individual noise sources were theoretically and experimentally related to the rms temeperature noise by an equation of the form: the dependence of A,B and C on the thermistor resistance, mode and rate of stirring, and physical boundary between the thermistors and the solution.

Journal ArticleDOI
TL;DR: In this paper, the experimental and theoretical determination of energies of conjugation of organic molecules has been studied for naphthoic acids, and a computation process has been applied to simple molecules comprising an hydrocarbon (styrene), an oxygen function (benzaldehyde) and a nitrogen function (aniline).


Journal ArticleDOI
G.L. Mol1
TL;DR: In this paper, the assembly and operation of a simple, directly coupled thermobalance and quadrupole mass spectrometer are described, and the decomposition of TDI and MDI polyurethanes, ABS plastic and a capped and uncapped polyester.

Journal ArticleDOI
TL;DR: In this paper, the enthalpies of the overall decomposition reactions CoX 2 L 2 (c) → CoX2 (c)+2L(g) and of the intermediate stepwise loss of ligand, L, where X is Cl or Br, and L is 3-chloropyridine, 3-bromopyrine, 2-methoxypyridine (2-chloropeyridine), 2-chloropyropyridine and 2-methylpyridine have been measured using a differential scanning calorimeter.

Journal ArticleDOI
TL;DR: In this article, the Gibbs energies of transfer from water to the same solvent mixtures were calculated and the results were discussed in terms of enhancement of the structuration of the aqueous network.

Journal ArticleDOI
TL;DR: In this paper, the ionization enthalpy of benzoic acid has been measured calorimetrically at 25°C in H 2 O ǫ DMSO mixtures ranging from pure water to a maximum DMS o molar ratio X DMSo = 0.80.

Journal ArticleDOI
TL;DR: In this paper, a gas-flow DTA was designed to investigate the chlorination reaction of Mg-containing complex ores (olivine, protoenstatite and talc) with Cl 2 -gas in a temperature range of 25-1000°C.