کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1329372 978907 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-pressure synthesis, crystal structure, and structural relationship of the first ytterbium fluoride borate Yb5(BO3)2F9
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
High-pressure synthesis, crystal structure, and structural relationship of the first ytterbium fluoride borate Yb5(BO3)2F9
چکیده انگلیسی

Yb5(BO3)2F9 was synthesized under high-pressure/high-temperature conditions in a Walker-type multianvil apparatus at 7.5 GPa and 1100 °C, representing the first known ytterbium fluoride borate. The compound exhibits isolated BO3-groups next to ytterbium cations and fluoride anions, showing a structure closely related to the other known rare-earth fluoride borates RE3(BO3)2F3 (RE=Sm, Eu, Gd) and Gd2(BO3)F3. Monoclinic Yb5(BO3)2F9 crystallizes in space group C2/c with the lattice parameters a=2028.2(4) pm, b=602.5(2) pm, c=820.4(2) pm, and β=100.63(3)° (Z=4). Three different ytterbium cations can be identified in the crystal structure, each coordinated by nine fluoride and oxygen anions. None of the five crystallographically independent fluoride ions is coordinated by boron atoms, solely by trigonally-planar arranged ytterbium cations. In close proximity to the above mentioned compounds RE3(BO3)2F3 (RE=Sm, Eu, Gd) and Gd2(BO3)F3, Yb5(BO3)2F9 can be described via alternating layers with the formal compositions “YbBO3” and “YbF3” in the bc-plane.

High-pressure/high-temperature synthesis (multianvil technique) led to the first ytterbium fluoride borate Yb5(BO3)2F9, built up from isolated BO3-groups. The compound shows structural relations to the known rare-earth fluoride borates RE3(BO3)2F3 (RE=Sm, Eu, Gd) and Gd2(BO3)F3.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 182, Issue 4, April 2009, Pages 888–895
نویسندگان
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