Synthesis and Crystal Structure of the Acentric Indium Borate InBO(OH).

The new acentric indium borate InBO(OH) was synthesized in a Walker-type multianvil apparatus at extreme pressure and temperature conditions of 12.3 GPa and 1500 °C. Single-crystal X-ray diffraction provided the data for the crystal structure solution and refinement. InBO(OH) crystallizes in the orthorhombic space group Fdd2 ( Z = 8) with the lattice parameters a = 39.011(8), b = 4.4820(9), c = 7.740(2) Å, and V = 1353.3(5) Å. The structure of InBO(OH) is basically built of corner-sharing BO tetrahedra and isolated InO octahedra. The presence of hydroxyl groups was confirmed with vibrational spectroscopic methods (IR and Raman). Furthermore, the second harmonic signal of an InBO(OH) powder sample yielded more than twice the intensity of quartz.