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Multianvil High-Pressure Synthesis and Crystal Structure of

-YbBO

3

Hubert Huppertz

Department Chemie, Ludwig-Maximilians-Universit¨at M¨unchen, Butenandtstraße 5-13 (Haus D), 81377 M¨unchen, Germany

Reprint requests to Dr. H. Huppertz. E-mail: huh@cup.uni-muenchen.de Z. Naturforsch.56 b,697–703 (2001); received April 5, 2001

Multianvil, High-Pressure Synthesis, Borates

-Ytterbium borate (-YbBO3) was synthesized under high-pressure in a Walker-type mul- tianvil apparatus at 2.2 GPa and 1400C. The title-compound crystallizes in the trigonal calcite structure, space group R¯3c. Single crystal X-ray data yielded a = 492.1(2), c = 1630.5(9) pm, wR2 = 0.0344 for 165 F2values and 11 variable parameters. Within the trigonal planar BO3

groups the B-O distance is 137.8(4) pm. The ytterbium atoms have a slightly distorted octahedral oxygen coordination (Yb-O: 224.4(2) pm).

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