Pr{sub 4}B{sub 10}O{sub 21}: A new composition of rare-earth borates by high-pressure/high-temperature synthesis
- Department Chemie und Biochemie, Ludwig-Maximilians-Universitaet Muenchen, Butenandtstrasse 5-13, D-81377 Munich (Germany)
High-pressure chemistry led to the synthesis of the rare-earth borate Pr{sub 4}B{sub 10}O{sub 21} using a Walker-type multianvil apparatus at 3.5 GPa and 1050 deg. C. The tetra-praseodymium(III)-decaborate crystallizes monoclinicly with four formula units in the space group P2{sub 1}/n and lattice parameters of a=710.2(2), b=1948.8(4), c=951.6(2) pm, and {beta}=93.27(3){sup o}. The boron-oxygen network consists of [BO{sub 4}]{sup 5-} tetrahedra and [BO{sub 3}]{sup 3-} groups; however, the [BO{sub 4}]{sup 5-} groups represent the major part (80%) due to the high-pressure conditions during the synthesis. The praseodymium ions are coordinated by 10 and 12 oxygen atoms. Along with a detailed description of the crystal structure, temperature programmed X-ray powder diffraction data are shown, demonstrating the metastable character of this compound. - Graphical abstract: Synthesis of Pr{sub 4}B{sub 10}O{sub 21} via the multianvil high-pressure/high-temperature technique representing a new composition of rare-earth borates.
- OSTI ID:
- 21015814
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 5; Other Information: DOI: 10.1016/j.jssc.2007.02.021; PII: S0022-4596(07)00095-3; Copyright (c) 2007 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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