High-Pressure Synthesis of the First Ternary Melilite-Type Compound Sc1.67B3O7

Sc1.67B3O7 was synthesized in a high-pressure/high-temperature experiment at 3.5 GPa/1200 degrees C employing a Walker-type multianvil module. The compound was characterized with X-ray diffraction and vibrational spectroscopy. It crystallizes in the tetragonal, acentric space group P (4) over bar2(1)m (no. 113) with the lattice parameters a = 6.6597(4) and c = 4.4364(3) angstrom. Sc1.67B3O7 is the first ternary compound adopting the melilite-type structure and therefore the simplest representative of this manifold structure family.