Structural, Morphological and Electrical Properties of La1-xSrxAlO3-δ (x = 0, 0.1, 0.15) Synthesized by the Pechini Method.

La1-xSrxAlO3-δ (x = 0, 0.1, 0.15) fine particles were prepared by the Pechini process using citric acid and ethylene glycol at low temperature 900 °C.

Review of polyhedral distortions as a multi-scale minimization of the electric polarization and their correlations with physical properties.

The Jahn-Teller (JT) and non-Jahn-Teller polyhedral distortions are reviewed within the same context, based on a multi-scale minimization of the electric polarization by handling formal ionic valences and valence electron density. This model is applied to tetragonal distortions of octahedra, particularly in K2NiF4 structures with different formula types, along with doping. The predictions are always in good agreement with the observed data.