High‐Pressure Synthesis and Crystal Structure of the Highly Condensed Yttrium Borate YB7O12

The yttrium borate YB7O12 was obtained in a high‐pressure/high‐temperature experiment at 10 GPa and 1573 K. The crystal structure was clarified by X‐ray single‐crystal diffraction, where the compound was found to crystallize in the orthorhombic space group Pccn (no. 56) with the lattice parameters a...

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Published inEuropean journal of inorganic chemistry Vol. 2019; no. 2; pp. 271 - 276
Main Authors Fuchs, Birgit, Schmitt, Martin K., Wurst, Klaus, Huppertz, Hubert
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 17.01.2019
Subjects
Borates
Crystal structure
Diffraction
High‐pressure chemistry
Inorganic chemistry
Lattice parameters
Oxygen atoms
Rare earths
Structure elucidation
Tetrahedra
Yttrium
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Summary:The yttrium borate YB7O12 was obtained in a high‐pressure/high‐temperature experiment at 10 GPa and 1573 K. The crystal structure was clarified by X‐ray single‐crystal diffraction, where the compound was found to crystallize in the orthorhombic space group Pccn (no. 56) with the lattice parameters a = 11.985(2), b = 6.717(6), c = 7.867(7) Å, and a volume of V = 633.0(1) Å3. Built up exclusively from BO4 tetrahedra, YB7O12 features an exceptionally high degree of condensation, which originates from the finding that every tetrahedron contains two threefold‐coordinated oxygen atoms. The compound was further characterized by X‐ray powder diffraction. YB7O12 was synthesized by a high‐pressure/high‐temperature reaction at 10 GPa and 1573 K. It crystallizes in the orthorhombic space group Pccn (no. 56) with a = 11.9846(11), b = 6.7168(6), and c = 7.8636(7) Å. The compound is built up exclusively from BO4 tetrahedra including threefold coordinated oxygen atoms exhibiting a highly condensed tetrahedral network.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.201801303