A theory of differential thermal analysis for a block-type system with spherical cells packed with inert material is developed. From the solution of DTA equations, a method for determining the reaction order, activation energy and frequency factor of the Arrhenius equation is presented. This method is applied to the decomposition of magnesite. The agreement between theory and experiment is very good.
Thermogravimetric device operating up to 2300°C under controlled atmospheres J. Vac. Sci. Technol. 13, 560 (1976); 10.1116/1.568953
Improved thermogravimetric magnetic susceptibility apparatusA thermogravimetric apparatus has been developed which can be operated at pressures up to 70 atm and 6(j()°C. A microforce transducer is used as the weighing device and the heater is placed inside the pressure vessel. Thermograms for the oxidation and evaporation of a crude oil at 70 atm are given to show typical performances of the apparatus.
A method is presented for estimating the dispersion-energy parameters of the canonically averaged pair potential energy function for polar molecules. The empirical parameters are correlated with critical temperature and polarizability through the principle of corresponding states and the Mavroyannis-Stephen dispersion theory. The method predicts viscosities and diffusivities of dilute gas mixtures which are within experimental uncertainty of measured values.
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