Synthesis and structure of Cs3Ti3As5O20
Abstract
A new ternary titanium arsenate, Cs3Ti3As5O20, has been synthesized and structurally characterized by single-crystal X-ray diffraction. It crystallizes in the orthorhombic space group Pbcm(no. 57) with a= 6.5084(9), b= 19.167(1), c= 15.377(1)Å, Z= 4 and R= 0.0259. The structure consists of tunnels where the caesium cations are located. The framework is formed by corner-sharing monomeric TiO6 octahedra, dimeric Ti2O11 units consisting of two corner-sharing TiO6 octahedra, AsO4 tetrahedra, and As2O7 groups. The structural formula is Cs3Ti(Ti2O)(AsO4)3(As2O7). The structure is compared with that of α-CsTi3P5O19.