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}
- 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, Vol. 177, Issue 10; Other Information: DOI: 10.1016/j.jssc.2004.06.026; PII: S0022-4596(04)00340-8; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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