Structure and Reactivity of the La2-xSrXMnO4±δ (0.7≤ X ≤1.0) Solid Solutions in Oxidizing Condition

Thibault Broux; M. Briand; C. Prestipino; Olivier Hernandez; Mona Bahout

doi:10.4028/www.scientific.net/KEM.617.98

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 617Structure and Reactivity of the La2-xSrXMnO4±δ...

Structure and Reactivity of the La_2-xSr_XMnO_4±δ (0.7≤ X ≤1.0) Solid Solutions in Oxidizing Condition

Abstract:

Single phase La_2xSr_xMnO_4±δ (0.7 x 1.0) solid solutions were prepared via sol-gel synthesis. For all the compositions the structure turns out to be tetragonal I4/mmm. Samples were then heated for 12 h at different temperatures in O₂ to investigate the structural response to oxygen uptake. On increasing the La/Sr ratio the maximum amount of oxygen inserted (δ) reaches for x = 0.7 an unprecedented value of δ ~ 0.47 in K₂NiF₄-structure type oxides, as evidenced from iodometric titration and thermogravimetric analysis. For the x 0.8 compositions the oxidation resulted in an intermediate orthorhombic phase.