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“Fundamental Building Block”-Descriptors

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High-Pressure Preparation, Crystal Structure, and Properties of RE

4

B

6

O

15

(RE = Dy, Ho) with an Extension of the

“Fundamental Building Block”-Descriptors

Hubert Huppertz

Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5Ð13 (Haus D), D-81377 München, Germany

Reprint requests to Dr. H. Huppertz. E-mail: huh@cup.uni-muenchen.de Z. Naturforsch.58 b,278Ð290 (2003); received February 11, 2003

High-pressure/high-temperature conditions of 8 GPa and 1000∞C were used to synthesize the new rare earth oxoboratesRE4B6O15(RE= Dy, Ho) in a Walker-type multianvil appara- tus. The single crystal X-ray structure determination of Ho4B6O15revealed the following data: C2/c, a= 1164.1(1), b= 436.7(1), c= 1882.5(1) pm, β= 96.71(1)∞, Z= 4, R1 = 0.0291, wR2 = 0.0505 (all data). The two isotypic compounds exhibit a new structure type built up from corrugated layers of BO4tetrahedra. In contrast to all known oxoborates the linking of the BO4tetrahedra is partially realizedviacommon edges. Regarding the “fundamental building block”-concept, we introduce a new descriptor “ ” for edge-sharing BO4tetra- hedra. Temperature-resolvedin situpowder diffraction measurements and IR/Raman-spec- troscopic investigations on Dy4B6O15are also reported.

Key words:High-Pressure, Borates, Fundamental Building Block

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