Effect of A-site cation ordering on the thermoelectric properties of the complex cobalt oxides Gd1-xSrxCoO3-delta (x=0.8 and 0.9)

Описание

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

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Издание

Журнал: CERAMICS INTERNATIONAL

Выпуск журнала: Vol. 44, Is. 9

Номера страниц: 10299-10305

ISSN журнала: 02728842

Место издания: OXFORD

Издатель: ELSEVIER SCI LTD

Авторы

  • Dudnikov V.A. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia)
  • Orlov Yu. S. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, Russia)
  • Kazak N.V. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia)
  • Fedorov A.S. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, Russia)
  • Solov'yov L.A. (RAS, Inst Chem & Chem Technol, Fed Res Ctr, KSC,SB, Krasnoyarsk 660049, Russia)
  • Vereshchagin S.N. (RAS, Inst Chem & Chem Technol, Fed Res Ctr, KSC,SB, Krasnoyarsk 660049, Russia)
  • Burkov A.T. (Russian Acad Sci, Ioffe Phys Tech Inst, St Petersburg 194021, Russia)
  • Novikov S.V. (Russian Acad Sci, Ioffe Phys Tech Inst, St Petersburg 194021, Russia)
  • Gavrilkin S.Yu. (Russian Acad Sci, Lebedev Phys Inst, Moscow 119991, Russia)
  • Ovchinnikov S.G. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, Russia)

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