单斜晶系
硼
结晶学
晶体结构
氧化物
氧化硼
粉末衍射
大气温度范围
氧化钠
材料科学
化学
分析化学(期刊)
物理
冶金
热力学
有机化学
色谱法
作者
Günter Heymann,Konstantin Beyer,Hubert Huppertz
标识
DOI:10.1515/znb-2004-11-1237
摘要
Abstract The new monoclinic oxide borates Na 2 RE 2 (BO 3 ) 2 O (RE = Dy, Ho) were synthesized using standard solid-state reactions in the temperature range 900 - 950 ◦ C. They are isotypic to the known phases Na 2 RE 2 (BO 3 ) 2 O (RE = Y, La, Nd, Sm-Gd, Er). The single crystal X-ray structure determination of Na 2 Dy 2 (BO 3 ) 2 O revealed: P2 1 /c, a = 1063.9(1), b = 626.2(1), c = 1025.3(1) pm, β = 117.76(1) ◦ , Z = 4, R1 = 0.0221, wR2 = 0.0402 (all data). The corresponding lattice parameters of Na2Ho2(BO3)2O determined from powder data are a = 1061.2(5), b = 623.7(2), c = 1022.5(3) pm, and β = 117.7(1) ◦ . The structure consists of infinite sheets of REO8-polyhedra in the bc-plane, which are seperated by sodium atoms. The BO 3 -groups are isolated forming layers in the bc-plane. The results of IR-spectroscopic investigations, temperature-resolved in-situ powder-diffraction measurements, and DTA/TG measurements on Na 2 Dy 2 (BO 3 ) 2 O are also presented.
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