Abstract
The first praseodymium fluoride borate Pr 4B 3O 10F was synthesized under high-pressure/high-temperature conditions in a Walker-type multianvil apparatus at 3 GPa and 800 °C, starting from stoichiometric mixtures of Pr 6O 11, B 2O 3, and PrF 3. Pr 4B 3O 10F crystallizes in space group P 1 ¯ with Z = 2 and lattice parameters a = 662.8(5) pm, b = 882.5(4) pm, and c = 894.1(5) pm, with α = 106.77(4)°, β = 108.67(3)°, γ = 104.92(4)° ( R1 = 0.0235 and wR2 = 0.0537 (all data)). The crystal structure is built up exclusively from isolated BO 3-groups. One of the boron atoms is located on a split position, leading to a BO 3-group, that can be orientated in the crystal structure in two different ways. This can be interpreted as a special case of an intermediate state between a BO 3-group and a BO 4-tetrahedron. The fluoride position is occupied to a small percentage by OH − ions.
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