Topochemical reduction of the oxygen-deficient Ruddlesden−Popper phase (n =1) La1.85Ca0.15CuO4− δ and electrical properties of the La1.85Ca0.15CuO3.5 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Arabian Journal of Chemistry Année : 2019

Topochemical reduction of the oxygen-deficient Ruddlesden−Popper phase (n =1) La1.85Ca0.15CuO4− δ and electrical properties of the La1.85Ca0.15CuO3.5

Résumé

The present paper reports on the synthesis, structure and electrical properties of the La1.85Ca0.15CuO3.5 compound. The topotactic reduction of the tetragonal oxide T-La1.85Ca0.15CuO4-delta with CaH2 results in the formation of La1.85Ca0.15CuO3.5. The powder X-ray diffraction data have shown that La1.85Ca0.15CuO3.5 adopts a face-centered monoclinic crystal structure (A 2/m, a = 8.6224(6), b = 3.8446(2) angstrom, c = 13.0179(10) and beta = 109.690(5)degrees) with anion vacancies located within the CuO2 (CuO1.5 square(0.5), where square represents an anion vacancy) layer of the phase. The topotactic reduction of the complex transition metal La1.85Ca0.15CuO4-delta may lead to the preparation of novel anion-deficient phases with unique transition metal-oxygen sublattices which cannot be prepared via the reduction of all-oxide substrates. The structural and chemical selectivity of the reduction process by anion de-intercalation and oxidation by anion insertion are reviewed. The oxidative monoclinic (La1.85Ca0.15CuO3.5) to tetragonal (T'-La1.85Ca0.15CuO4-delta) transition occurs at 380 degrees C. The structural determination combined with accurate compositional and electrical characterization indicates a change in the charge-compensating mechanism with phase transition. (C) 2016 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University.
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hal-03489190 , version 1 (31-05-2022)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Adnene Midouni, Mohamed Ikbal Houchati, Walid Ben Haj Othmen, Nassira Chniba-Boudjada, Ahmed Hichem Hamzaoui. Topochemical reduction of the oxygen-deficient Ruddlesden−Popper phase (n =1) La1.85Ca0.15CuO4− δ and electrical properties of the La1.85Ca0.15CuO3.5. Arabian Journal of Chemistry, 2019, 12 (8), pp.4377 - 4387. ⟨10.1016/j.arabjc.2016.06.006⟩. ⟨hal-03489190⟩
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