Synthesis and structure study of new manganese and indium based phosphate: (Ca,Ba)_1.222Mn_0.923In_1.570(PO₄)₃

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

^* Correspondence e-mail: h.benhsina@gmail.com

Abstract

Phosphates are an important class of materials which are well-known due to their structural diversity and their important potential application in many fields of sciences. A member of this family, represented by transition metal phosphates, is in the forefront of important researchers. A new manganese and indium based phosphate is successfully isolated by means of solid state reaction. Its corresponding crystal structure is isotypic to the alluaudite and crystallizes in the monoclinic system with the space group C2/c and cell parameters a=12.4697(5)Å ; b=12.9365(5)Å ; c=6.5625(3)Å and β=115.603(1)°. The framework of this phosphate is built up on the basis of MnO₆, InO₆ and PO₄ polyhedra. The InO₆ octahedra are linked together via common edge, leading to the formation of In₂O₁₀ dimers. The In₂O₁₀ dimers share edge with MnO₆ octahedra, generating chains along the [101] direction. The PO₄ tetrahedra connect two chains giving arise to a three-dimensional framework with hexagonal tunnels where the barium and calcium are located.