Rietveld refinements of a new solid solution Ba _{(3− <i>x</i> )} Sr _<i>x</i> (PO ₄ ) ₂ (0≤ <i>x</i> ≤3)

Abstract

Ba (3− x ) Sr x (PO 4 ) 2 orthophosphates (0≤ x ≤3) have been prepared by solid state reaction. The final temperature was 1000°C. The X-ray diffraction analyses show the existence of a continuous solid solution. Ba (3− x ) Sr x (PO 4 ) 2 orthophosphates (0≤ x ≤3) crystallize in the hexagonal system with the space group R 3 m . Their structure is based on a three-dimensional framework constructed of infinite layers of Ba1/Sr1O 12 linked and parallel to infinite layers of Ba2/Sr2O 10 polyhedra and PO 4 tetrahedra.