In this work we report about a new oxoborate β-ZnB4O7 synthesized under high-
pressure/high-temperature conditions from zinc oxide ZnO and boron oxide B2O3 with a
walker-type multianvil apparatus at 10.5 GPa and 1100° C. Single crystal X-ray structure
determination of β-ZnB4O7 revealed: Cmcm, a= 1085.0 (1) pm, b= 648.9 (1) pm, c= 517.3
(1) pm, Z= 4, R1= 0.0182, wR2= 0.0478 (all data). The compound exhibits a new structure
type which is built up from linked tetrahedral BO4-groups (□) forming a network. The most …

This paper reports about two new hydrogen-containing rare-earth oxoborates RE4B6O14
(OH) 2 (RE= Dy, Ho) synthesized under high-pressure/high-temperature conditions from the
corresponding rare-earth oxides, boron oxide, and water using a Walker-type multianvil
equipment at 8GPa and 880° C. The single crystal structure determination of Dy4B6O14
(OH) 2 showed: Pbcn, a= 1292.7 (2), b= 437.1 (2), c= 887.3 (2) pm, Z= 2, R1= 0.0190, and
wR2= 0.0349 (all data). The isotypic holmium species revealed: Pbcn, a= 1292.8 (2), b …