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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >High-pressure Syntheses and Characterization of the Rare-earth Fluoride Borates RE~2(BO~3)F~3 (RE=Tb, Dy, Ho)
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High-pressure Syntheses and Characterization of the Rare-earth Fluoride Borates RE~2(BO~3)F~3 (RE=Tb, Dy, Ho)

机译:稀土硼酸盐RE〜2(BO〜3)F〜3(RE = Tb,Dy,Ho)的高压合成与表征

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摘要

The new rare-earth fluoride borates RE~2(BO~3)F ~3 (RE=Tb, Dy, Ho) were synthesized under highpressure/ high-temperature conditions of 1:5 GPa=1200 °C for Tb2(BO ~3)F~3 and 3:0 GPa=900 °C for Dy ~2(BO~3)F~3 and Ho~2(BO~3)F~3 in a Walker-type multianvil apparatus from the corresponding rareearth sesquioxides, rare-earth fluorides, and boron oxide. The single-crystal structure determinations revealed that the new compounds are isotypic to the known rare-earth fluoride borate Gd~2(BO~3)F~3. The new rare-earth fluoride borates crystallize in the monoclinic space group P21/c (Z = 8) with the lattice parameters a=16:296(3), b=6:197(2), c=8:338(2) ?, β =93:58(3)° for Tb~2(BO ~3)F~3, a= 16:225(3), b = 6:160(2), c = 8:307(2) ?, β = 93:64(3)° for Dy~2(BO~3)F ~3, and a = 16:189(3), b = 6:124(2), c = 8:282(2) ?, β = 93:69(3)° for Ho~2(BO~3)F~3. The four crystallographically different rare-earth cations (CN=9) are surrounded by oxygen and fluoride anions. All boron atoms form isolated trigonal-planar [BO~3]~(3-) groups. The six crystallographically different fluoride anions are in a nearly planar coordination by three rare-earth cations.
机译:在1:5 GPa = 1200°C的高压/高温条件下合成了新的稀土氟化硼硼酸盐RE〜2(BO〜3)F〜3(RE = Tb,Dy,Ho)在Walker型多砧装置中,由相应的稀土倍半氧化物组成的Dy〜2(BO〜3)F〜3和Ho〜2(BO〜3)F〜3的3)F〜3和3:0 GPa = 900°C ,稀土氟化物和氧化硼。单晶结构测定表明,新化合物与已知的稀土氟化硼酸盐Gd〜2(BO〜3)F〜3同型。新的稀土氟化硼硼酸盐在单斜空间群P21 / c(Z = 8)中结晶,晶格参数为a = 16:296(3),b = 6:197(2),c = 8:338(2) )?,对于Tb〜2(BO〜3)F〜3,β= 93:58(3)°,a = 16:225(3),b = 6:160(2),c = 8:307(2 )?,对于Dy〜2(BO〜3)F〜3,β= 93:64(3)°,a = 16:189(3),b = 6:124(2),c = 8:282( 2)对于Ho〜2(BO〜3)F〜3,β,β= 93∶69(3)°。四个晶体学上不同的稀土阳离子(CN = 9)被氧和氟离子包围。所有硼原子形成孤立的三角平面[BO〜3]〜(3-)基团。六个晶体学上不同的氟阴离子由三个稀土阳离子以几乎平面的方式配位。

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