High-pressure syntheses and crystal structures of orthorhombic DyGaO 3 and trigonal GaBO 3

Orthorhombic dysprosium orthogallate DyGaO 3 and trigonal gallium orthoborate GaBO 3 were synthesized in a Walker-type multianvil apparatus under high-pressure/high-temperature conditions of 8.5 GPa/1350 °C and 8 GPa/700 °C, respectively. Both crystal structures could be determined by single-crystal X-ray diffraction data collected at room temperature. The orthorhombic dysprosium orthogallate crystallizes in the space group Pnma ( Z = 4) with the parameters a = 552.6(2), b = 754.5(2), c = 527.7(2) pm, V = 0.22002(8) nm 3 , R 1 = 0.0309, and wR 2 = 0.0662 (all data) and the trigonal compound GaBO 3 in the space group R 3̅ c (Z = 6) with the parameters a = 457.10(6), c = 1419.2(3) pm, V = 0.25681(7) nm 3 , R 1 = 0.0147, and wR 2 = 0.0356 (all data).