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Synthesis and crystal structure of the new high-pressure phase CdB2O4

机译:新型高压相CdB2O4的合成与晶体结构

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The use of high-pressure/high-temperature conditions (7.5 GPa and 11.00 degrees C; Walker-type multianvil apparatus) led to the synthesis of a new cadmium borate CdB2O4, starting from stoichiometric mixtures of the oxides. The crystal structure was determined on the basis of single crystal Xray diffraction data, to reveal the hexagonal space group P6(3) with a = 885.2(2), c=716.72(8) pm, Z=8, R-1=0.0178, and wR(2)=0.0388 (all data). CdB2O4 is built up from interconnected layers of BO4-tetrahedra and exhibits for the first time the basic structure of a family of compounds, represented by BaGa2O4, KAlSiO4, KGeAlO4, KCoPO4, CaP2N4 and the recently discovered SrP2N4. The lack of superstructure ordering in CdB2O4 was confirmed by electron diffraction. Additionally, a B-O-B angle of 180 degrees was found in this borate for the first time.
机译:高压/高温条件(7.5 GPa和11.00摄氏度; Walker型多砧装置)的使用从氧化物的化学计量混合物开始,合成了新的硼酸镉CdB2O4。根据单晶X射线衍射数据确定晶体结构,以揭示六边形空间群P6(3),其中a = 885.2(2),c = 716.72(8)pm,Z = 8,R-1 = 0.0178 ,并且wR(2)= 0.0388(所有数据)。 CdB2O4由BO4-四面体的互连层构建而成,并首次展示出以BaGa2O4,KAlSiO4,KGeAlO4,KCoPO4,CaP2N4和最近发现的SrP2N4代表的一系列化合物的基本结构。通过电子衍射证实了CdB2O4中缺乏上层结构的有序性。另外,首次在该硼酸盐中发现了180度的B-O-B角。

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