Abstract

Pr 3 (SiO 4 ) 2 Cl is isostructural with La 3 (SiO 4 ) 2 Cl. The Pr(1)O 7 Cl polyhedron is irregular. The Pr(2)O 8 Cl 2 polyhedron is a distorted square antiprism with the Cl atom capping distorted square faces. The site of Pr(2) can also be described as at the centre of a Pr(2)(SiO 4 ) 4 Cl 2 octahedron. The structure comprises layers of Pr(2)(SiO 4 ) 4 Cl 2 octahedra separated in the a direction by Pr(1) cations occupying the Pr(1)O 7 Cl polyhedral sites. The Cl atom is four-coordinate forming a distorted square.

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