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Structure and conductivity of acceptor doped La2BaZnO5 and Nd2BaZnO5

MD khairul Hoque (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; R. Haugsrud ; Christopher S Knee (Institutionen för kemi och kemiteknik, Oorganisk miljökemi)
Solid State Ionics (0167-2738). Vol. 272 (2015), p. 160-165.
[Artikel, refereegranskad vetenskaplig]

The effect of calcium substitution on the structure and electrical conductivity of Ln(2 - x)Ca(x)BaZnO(5 - delta), Ln = La and Nd, has been studied. Differing trends with respect to dependence of the unit cell volume were observed as a function of Ca substitution. For both series of materials the limit of Ca substitution was estimated to be x approximate to 0.2. The electrical conductivity was studied in the temperature range of 1000-350 degrees C using electrochemical impedance spectroscopy in argon and oxygen atmospheres and via isotherms between 400 and 1000 degrees C as function of oxygen pressure and the water vapour pressure. A marked increase in conductivity of approx. two orders of magnitude was explained by the presence of oxygen vacancies in the calcium doped samples. At pO(2) < 10(-12) atm atm the x = 0.15 materials are predominantly oxygen ion conductors, and La1.85Ca0.15BaZnO5 - delta displays a peak conductivity of 0.002 S cm(-1) at 1000 degrees C. The materials display a rise in conductivity in oxidizing conditions, indicating a significant p-type contribution.

Nyckelord: Oxide ion conductor, Mixed conductor, Synthesis, Impedance spectroscopy, SOFC, OXIDE-ION CONDUCTORS, PEROVSKITE, ELECTROLYTES, TRANSPORT, SYSTEM, HO, DY, ND, ER, Chemistry, Physical, Physics, Condensed Matter, CHEL C, 1982, JOURNAL OF SOLID STATE CHEMISTRY, V42, P176

Denna post skapades 2015-05-26.
CPL Pubid: 217558


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Institutionen för kemi och kemiteknik, Oorganisk miljökemi


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