Abstract
The rare-earth fluoride borates RE4B4O11F2 (RE = Eu, Dy) were synthesized in a Walkertype multianvil apparatus from the corresponding rare-earth oxides and fluorides, and boron oxide. Eu4B4O11F2 was obtained under high-pressure/high-temperature conditions of 5 GPa and 900 °C, and Dy4B4O11F2 at 8 GPa and 1000 °C. The single-crystal structure determinations revealed that both compounds are isotypic to Gd4B4O11F2, crystallizing in the space group C2/c (Z = 4) with the parameters a = 1368.2(3), b = 465.4(1), c = 1376.6(3) pm, β = 91.2(1)°, V = 0.8765(3) nm3, R1 = 0.0232, and wR2 = 0.0539 (all data) for Eu4B4O11F2 and a = 1349.5(3), b = 460.9(1), c = 1362.5(3) pm, β = 91.3(1)°, V = 0.8472(3) nm3, R1 = 0.0353, and wR2 = 0.0729 (all data) for Dy4B4O11F2. These phases are entirely different from the recently discovered lanthanum fluoride borate La4B4O11F2, which exhibits the same constitution in another structure type with space group P21/c.
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