Тип публикации: статья из журнала
Год издания: 2018
Идентификатор DOI: 10.1016/j.ceramint.2018.03.037
Ключевые слова: Substituted rare earth cobalt oxides, Thermoelectric oxide materials, Ordered and disordered states
Аннотация: The effect of substitution of Sr2+ ions for Gd3+ ions on the phase composition, electrical resistivity, thermoelectricity, and thermal conductivity of rare-earth cobalt oxides Gd1-xSrxCoO3-delta (x = 0.8 and 0.9) has been investigated. It has been determined that at the investigated strontium concentrations, the single-phase disordПоказать полностьюered nonstoichiometric cubic perovskites and superstructures with ordered Sr2+/Gd3+ ions and anion vacancies can be formed. The influence of ordering/disordering of Gd and Sr cations over crystal-lattice A- sites on the thermoelectric figure of merit and sample stability at high temperatures has been studied. The thermoelectric figure of merit of the disordered samples was found to exceed by far the analogous parameter of the ordered samples, which allows us to consider the disordering as a way of improving the thermoelectric parameters. Two contributions to the conductivities are discussed: high-temperature thermoactivation and low-temperatures variable range hopping. The parameters of the Mott electronic structure, including DOS N(epsilon(F)), hopping energy epsilon (the energy of hopping conductivity activation), and hopping length R-h, have been estimated
Журнал: CERAMICS INTERNATIONAL
Выпуск журнала: Vol. 44, Is. 9
Номера страниц: 10299-10305
ISSN журнала: 02728842
Место издания: OXFORD
Издатель: ELSEVIER SCI LTD