Local structure and electronic properties of the rhombohedral and orthorhombic colossally magneteresistive manganites La1-xNaxMnO3 by Mn-K edge EXAFS and XANES

Article Abstract:

The local structure and electronic properties of Mn in Na doped lanthanum manganites is investigated by means of Mn-K edge XAFS, at various temperatures ranging from RT to 30 K. It was found that the Mn (IV) content of the samples as determined by the chemical shift of the Mn-K edge is slightly different with respect to that calculated on the basis of the quasi-chemical equilibria leading to doping on the La site and to oxygen nonstoicchiometry.

Industrial inorganic chemicals, not elsewhere classified, Manganese Compounds, Electric properties, Chemical properties

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Structure of burkeite and a new crystalline species obtained from solutions of sodium carbonate and sodium sulfate

Article Abstract:

Crystallization from aqueous solutions containing sodium carbonate and sodium sulfate can produce crystals of a double salt commonly known as burkeite. The maximum ratio of carbonate to sulfate in burkeite crystals was shown to be 1:1, and this limitation was explained by examination of the lattice structure of burkeite.

Observations, Aqueous solution reactions, Atomic properties

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