从P-Mo(Ⅴ)杂多化合物合成多形貌Al_(13)基钼酸盐晶体

Al_(13) Based Molybdate Crystals with Multimorphologies Synthesized from P-Mo(Ⅴ) Heteropoly Compounds

以H3PMo12O4·0nH2O、H4PMo11VO4·0nH2O和(NH4)6P2Mo18O6·2nH2O3种杂多化合物为钼源,采用直接混合后陈化的方法合成了多形貌A113基钼酸盐晶体,相应A113基钼酸盐晶体的形貌和尺寸分别是斜方三棱柱形(80μm×30μm)、星形(30μm×10μm)和叶片形(500μm×150μm)。粉末X射线衍射结果表明这3种多形貌A113基钼酸盐晶体结晶较好,在2θ为6.65°、8.00°和14.16°处都有强而尖锐的衍射峰。而以Na2MoO4·2H2O为钼源时只能制得无定形簇合物。根据ICP、FTIR和TG/DTG结果给出多形貌的Al13基钼酸盐晶体的化学简式为Na[AlO4Al12(OH)24(H2O)12][MoO4]·48H2O。初步探讨了A113基钼酸盐晶体的形成机理。

The Al13 based molybdate crystals with multimorphologies were synthesized via a direct mixing and aging method. The heteropoly compounds of H3PMo12O40·nH2O, H4PMo11VO40·nH2O and (NH4)6P2Mo18O62·nH2O (abbr. P-Mo(v) heteropoly compounds) were employed as the molybdate sources. The corresponding morphology and size of the molybdate crystals is trimetrical-prismy like (80 μm × 30 μm), star-like (30 μm × 10 μm) and leaf-like (500 μm × 150 μm). XRD patterns show that the Al13 based molybdates with multimorphologies are of high crystallinity, and have strong and sharp peaks (2θ) at 6.65°, 8.00° and 14.16°. However, when Na2MoO4·2H2O was used, there were only amorphous clusters in a similar process. According to the results of ICP, FTIR and TG / DTG, the chemical formula of the Al13 based molybdate crystals is Na[AlO4Al12(OH)24(H2O)12][MoO4]4·8H2O. The probable crystal growth mechanism is proposed.