Two Indium Sulfate Tellurites: Centrosymmetric In-2(So4)(Teo3)(Oh)(2)(H2o) And Non-Centrosymmetric In-3(So4)(Teo3)(2)F-3(H2o)

Two new indium sulfate tellurites, namely, In-2(SO4)(TeO3)(OH)(2)(H2O) and In-3(SO4)(TeO3)2F(3)(H2O), were synthesized by hydrothermal method in a one-pot reaction. Their pure phase yields have been successfully optimized to 76% and 21%, respectively. In-2(SO4)(TeO3)(OH)(2)(H2O) crystallized in centrosymmetric (CS) space group P21/n, while In-3(SO4)(TeO3)(2)F-3(H2O) formed a non-centrosymmetric (NCS) and chiral space group P2(1)2(1)2(1). The CS compound features a 2D layered structure composed of 2D indium oxide layers decorated by sulfate tetrahedra and tellurite groups. The NCS compound displays a 3D network consisting of indium tellurite layers bridged by sulfate tetrahedra. Powder second harmonic generation measurements disclosed that In-3(SO4)(TeO3)(2)F-3(H2O) exhibits a weak frequency-doubling efficiency about 11% of the commercial KDP. Its powder laser damage threshold quantity was estimated to be 79.6 MW/cm(2), which is about 36 times that of AGS. The two samples present wide optical band gaps of 4.86 and 4.10 eV, respectively, which were determined by Te, In, and O atoms based on density functional theory calculations.