Вид документа : Статья из журнала Шифр издания : 54/T 44 Автор(ы) : Anikina P. V., Markov A. A., Patrakeev M. V., Leonidov I. A., Kozhevnikov V. L. Заглавие : The Structure, Nonstoichiometry, and Thermodynamic Characteristics of Oxygen in Strontium Ferrite Doped with Niobium, SrFe1-xNbxO3-δ Место публикации : Russian Journal of Physical Chemistry A. - 2009. - Vol. 83, № 5. - С. 699-704: il. Примечания : Bibliogr. : p. 704 (14 ref.) ISSN: 0036-0244 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): нестехиометрия--кислород--феррит стронция--допирование--ниобий Аннотация: The influence of doping with niobium on the structure and oxygen nonstoichiometry of strontium ferrite SrFe1 –xNbxO3 –δ(x= 0.05, 0.1, 0.2, 0.3, and 0.4) was studied. The content of oxygen in the doped derivatives was determined by coulometric titration as a function of temperature (650–950°C) and oxygen partialpressure in the gas phase (10–4–1 atm). The partial molar enthalpies ΔΉo(x,δ) and entropies ΔSo(x,δ) of oxygen in SrFr1−xNbxO3 –δ were calculated. An analysis of ΔSo(x,δ) dependences showed that the model of a random distribution of ions and vacancies over accessible sites in the oxygen sublattice allowed the experimental data to be described satisfactorily. An increase in the partial enthalpy ΔHo(x,δ) as nonstoichiometry δ decreased was indicative of weak repulsive interactions between oxygen ions in the structure of SrFe1 –xNbxO3 –δ Доп.точки доступа: Anikina, P. V.; Markov, A. A.; Patrakeev, M. V.; Патракеев Михаил Валентинович; Leonidov, I. A.; Леонидов Илья Аркадьевич; Kozhevnikov, V. L.; Кожевников Виктор Леонидович