Multianvil high-pressure/high-temperature preparation, crystal structure, and properties of the new oxoborates Dy{sub 4}B{sub 6}O{sub 14}(OH){sub 2} and Ho{sub 4}B{sub 6}O{sub 14}(OH){sub 2}

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.06.026· OSTI ID:20653387

Huppertz, Hubert ^[1]

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1. Department Chemie und Biochemie, Ludwig-Maximilians-Universitaet Muenchen, Butenandtstrasse 5-13 (Haus D), 81377 Munich (Germany)

This paper reports about two new hydrogen-containing rare-earth oxoborates RE{sub 4}B{sub 6}O{sub 14}(OH){sub 2} (RE=Dy, Ho) synthesized under high-pressure/high-temperature conditions from the corresponding rare-earth oxides, boron oxide, and water using a Walker-type multianvil equipment at 8GPa and 880 deg. C. The single crystal structure determination of Dy{sub 4}B{sub 6}O{sub 14}(OH){sub 2} showed: Pbcn, a=1292.7(2), b=437.1(2), c=887.3(2)pm, Z=2, R1=0.0190, and wR2=0.0349 (all data). The isotypic holmium species revealed: Pbcn, a=1292.8(2), b=436.2(2), c=887.1(2)pm, Z=2, R1=0.0206, and wR2=0.0406 (all data). The compounds exhibit a new type of structure, which is built up from layers of condensed BO{sub 4}-tetrahedra. Between the layers, the rare-earth cations are coordinated by 7+2 oxygen atoms. Furthermore, we report about temperature-resolved in situ powder diffraction measurements, DTA/TG, and IR-spectroscopic investigations into RE{sub 4}B{sub 6}O{sub 14}(OH){sub 2} (RE=Dy, Ho)

• OSTI ID: 20653387
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 177; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BORATES
BORON OXIDES
CATIONS
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
DYSPROSIUM COMPOUNDS
HOLMIUM COMPOUNDS
LAYERS
MONOCRYSTALS