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381.
Ekaterina I. Goldyreva Ilya A. Leonidov Mikhail V. Patrakeev Victor L. Kozhevnikov 《Journal of Solid State Electrochemistry》2013,17(12):3185-3190
The experimental data for equilibrium oxygen content were used in order to extract increments of partial molar thermodynamic functions of oxygen with changes of oxygen stoichiometry in calcium manganite CaMnO3???δ . It is shown that along with the oxygen exchange reaction, thermal excitation of Mn4+ cations plays an important role in equilibration of charged manganese species that appear in response to the loss of oxygen at heating. The interrelation of partial molar enthalpy and entropy of oxygen with electron and ion defect formation parameters is obtained in approximation of the point defect model. The nearly linear changes of oxygen partial molar enthalpy are shown to directly reflect thermally driven changes in concentration of Mn3+ cations. 相似文献
382.
A. M. Chibiryaev A. Ermakova I. V. Kozhevnikov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2011,85(8):1347-1357
Revision of the experimental data on α-pinene thermal isomerization attained in supercritical ethanol allowed us to expand
the reaction scheme, which includes now six main products and eleven reversible reactions. The equilibrium constants of every
reaction (K
T, j
and K
Φ, j) were calculated to allow for reversibility of reactions. The thermochemical data of the pure compounds required to calculate
constants K
T, j
and K
Φ, j
(standard enthalpy and entropy of formation Δf
H° (298.15 K), Δf
S° (298.15 K), heat capacity C
p
(T), critical parameters T
cr and p
cr, boiling point T
b, and the acentric factor ω) were preliminary estimated using the empirical Joback and Benson methods. A kinetic model based
on the new expanded scheme of reversible reactions was successfully identified and its kinetic parameters k
j
(600 K) and E
j
were determined. Detailed examination of the new kinetic model allowed us to refine the generally accepted mechanism of α-pinene
thermal isomerization and to distinguish additional features of the multistep process. 相似文献
383.
Russian Physics Journal - The method proposed by the authors for solving the Helmholtz equation with homogeneous boundary conditions was verified for an elliptic cross section. The method is... 相似文献
384.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献
385.