Description:
<jats:p>The compounds β -RE(BO<jats:sub>2</jats:sub>)<jats:sub>3</jats:sub> [RE = Nd (neodymium meta-borate), Sm (samarium meta-borate) and Gd (gadolinium meta-borate)] were synthesized under high-pressure and high-temperature conditions in a Walker-type multianvil apparatus at 3.5 GPa (Nd), 7.5 GPa (Sm, Gd) and 1050 °C. The crystal structures were determined by single crystal X-ray diffraction data collected at r. t. (Sm, Gd) and at−73°C (Nd), respectively. The structures are isotypic with the already known ambient-pressure phases β -RE(BO<jats:sub>2</jats:sub>)<jats:sub>3</jats:sub> (RE = (Tb, Dy) and the high-pressure phases β -RE(BO<jats:sub>2</jats:sub>)<jats:sub>3</jats:sub> (RE = Ho-Lu)</jats:p>