High-pressure/high-temperature conditions of 8 GPa and 1000°C were used to synthesize
the new rare earth oxoborates RE4B6O15 (RE = Dy, Ho) in a Walker-type multianvil apparatus.
The single crystal X-ray structure determination of Ho4B6O15 revealed the following
data: C2/c, a = 1164.1(1), b = 436.7(1), c = 1882.5(1) pm, β = 96.71(1)°, Z = 4, R1 = 0.0291, wR2 = 0.0505 (all data). The two isotypic compounds exhibit a new structure type built up from corrugated layers of BO4 tetrahedra. In contrast to all known oxoborates the linking
of the BO4 tetrahedra is partially realized via common edges. Regarding the “fundamental
building block”-concept, we introduce a new descriptor “” for edge-sharing BO4 tetrahedra.
Temperature-resolved in situ powder diffraction measurements and IR/Raman-spectroscopic
Zeitschrift für Naturforschung B is an international scientific journal which publishes original papers, microreviews, and letters from all areas of inorganic chemistry, solid state chemistry, coordination chemistry, molecular chemistry, and organic chemistry.