Crystal Chemistry of the Noncentrosymmetric Eulytites: A<sub>3</sub>Bi(XO<sub>4</sub>)<sub>3</sub> (X = V, A = Pb; X = P, A = Ca, Cd, Sr, Pb)
作者:Prangya Parimita Sahoo、T. N. Guru Row
DOI:10.1021/ic101316u
日期:2010.11.1
984(5), 9.8611(3), 10.2035(3), and 10.3722(2) Å for Ca3Bi(PO4)3, Cd3Bi(PO4)3, Sr3Bi(PO4)3, and Pb3Bi(PO4)3 respectively, and there are four formula units in the unit cell. The structure of Pb3Bi(VO4)3, a unique eulytite with vanadium substitution, is compared with all these phosphorus substituted eulytites. The A2+ and Bi3+ cations occupy the special position (16c) while the O anions occupy the general
纤锌矿化合物A 3 Bi(XO 4)3(X = P,A = Ca,Cd,Sr,Pb),属于单晶X射线测定的非中心对称空间群I 4No3 d(No. 220)衍射研究。由于化合物Pb 3 Bi(PO 4)3的熔化温度不同,这些化合物很难通过熔融冷却技术生长出来。Ca 3 Bi(PO 4)3,Cd 3 Bi(PO 4)的晶胞参数a为9.984(5),9.8611(3),10.2035(3)和10.3722(2)Å如图3所示,分别具有Sr 3 Bi(PO 4)3和Pb 3 Bi(PO 4)3,并且在单位晶格中有四个公式单元。将Pb 3 Bi(VO 4)3这种具有钒取代作用的独特的富余沸石与所有这些磷取代的富余沸石进行了比较。在晶体结构中,A 2+和Bi 3+阳离子占据特殊位置(16 c),而O阴离子占据一般Wyckoff位置(48 e)。对于Pb 3 Bi(PO 4)仅识别出一个O位置3和Pb 3