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The new orthorhombic polymorph β-HgB 4 O 7  has been synthesized under high-pressure and hightemperature conditions in a Walker-type multianvil apparatus at 7.5 GPa and 600 °C. β-HgB 4 O 7  is isotypic to the known ambient pressure phases MB 4 O 7  (M = Sr, Pb, Eu) and the high-pressure phase β-CaB 4 O 7  crystallizing with two formula units in the space group Pmn2 1  with lattice parameters a = 1065.6(2), b = 438.10(9), and c = 418.72(8) pm. The relation of the crystal structure of the high-pressure phase β-HgB 4 O 7  to the normal pressure phase α-HgB 4 O 7  as well as the relation to the isotypic phases MB 4 O 7  (M = Sr, Pb, Eu) and β-CaB 4 O 7  are discussed.

High-Pressure Synthesis and Crystal Structure of the New Orthorhombic Polymorph β-HgB 4 O 7