Person:
García Alvarado, Flaviano

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First Name
Flaviano
Last Name
García Alvarado
URI
https://hdl.handle.net/20.500.14352/83095
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Area
Química Inorgánica
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Author: Amador Elizondo, Ulises ×

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    New perovskite materials of the La2-xSrxCoTiO6 series
    (Dalton Transactions, 2011) Yuste, Mercedes; Pérez Flores, Juan Carlos; Romero de Paz, Julio; Azcondo Sánchez, María Teresa; García Alvarado, Flaviano; Amador Elizondo, Ulises
    Substitution of La3+ by Sr2+ in the double perovskite La2CoTiO6 yields materials of the La2-xSrxCoTiO6 series showing a significant amount of trivalent cobalt ions when prepared at ambient atmosphere. The as-prepared compounds can be reduced in severe conditions retaining the perovskite structure while inducing the formation of a large amount of oxygen vacancies. The limit of aliovalent substitution in this series was found to extend up to x = 1. For substitution of La3+ up to 15% cobalt and titanium are ordered, though the order is progressively lost as x increases; for x ≥ 0.30 no ordering is observed as evidenced by magnetic measurements. The ability of these materials to present either cobalt ions in a mixed oxidation state or large amounts of anion vacancies depending on the atmosphere makes them interesting to be further investigated regarding their electrical and electrochemical properties, and hence, their usefulness in some electrochemical devices.