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Multianvil High-Pressure Syntheses and Crystal Structures of the New Rare-Earth Oxoborates χ-DyBO3 and-χ-ErBO3

✍ Scribed by Hubert Huppertz; Benjamin von der Eltz; Rolf-Dieter Hoffmann; Holger Piotrowski

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 407 KB
Volume: 166
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2002.9583

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✦ Synopsis

DyBO 3 and -ErBO 3 were synthesized under high-pressure/ high-temperature conditions from Dy 2 O 3 (Er 2 O 3 ) and boron oxide B 2 O 3 in a Walker-type multianvil apparatus at 8 GPa and 1600 K. Both compounds crystallize with a pronounced subcell. Single crystal X-ray data of the normal cell yielded: P1 , a ‫)1(0.427؍‬ pm, b ‫؍‬ 901.1(1) pm, c ‫؍‬ 987.2(1) pm, ‫؍‬ 81.40(2)3 3, ‫؍‬ 85.67(2)3 3, ‫؍‬ 77.02(2)3 3, Z ‫؍‬ 12, R1 ‫؍‬ 0.0448, wR2 ‫؍‬ 0.0922 for -DyBO 3 and a ‫؍‬ 718.1(1) pm, b ‫؍‬ 897.1(1) pm, c ‫؍‬ 980.2(1) pm, ‫؍‬ 81.32(2)3 3, ‫3)2(45.58؍‬ 3, ‫؍‬ 77.11(2)3 3, Z ‫؍‬ 12, R1 ‫؍‬ 0.0452, wR2 ‫؍‬ 0.0807 for -ErBO 3 . The compounds are isotypical and contain Ln 3؉ -ions (Ln ‫؍‬ Dy, Er) as well as layers built up from the new non-cyclic [B 3 O 9 ] 9؊anions, which exhibit one trigonal BO 3 -(᭝ ᭝) and two tetrahedral BO 4 -groups (ᮀ ᮀ) according to 1᭝ ᭝2ᮀ ᮀ:᭝ ᭝2ᮀ ᮀ. Temperatureresolved X-ray powder di4raction shows the metastable character of -DyBO 3 . 2002 Elsevier Science (USA)

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