Structural exploration on powder diffraction a nice tool for rexamination of phase diagram

Abstract
The aim of this work is the structural exploration of the La₂O₃-WO₃ phase diagram. Indeed, like many phase diagrams La₂O₃-WO₃ was built in the 70s, but definite compounds structures were not determined and are still unknown. In the present contribution, we focus on La₆W₂O₁₅, La₂WO₆ and La₁₄W₈O₄₅. These compounds are synthesized as powder by solid state reaction and characterized by X-ray powder diffraction, gravimetric and differential thermal analysis.