Ni—Zn—Fe氢氧化物的低温自发固相反应

Low-temperature Spontaneous Solid State Reaction of Ni-Zn-Fe Hydroxide

摩尔比为Ni2＋：Zn2＋：Fe3＋：0．6：0．4：2．0的水溶液与OH-在气泡液膜中进行共沉淀反应，制得0．6Ni（OH）2（H2O）0.75·（0．4-n）Zn（On）2·2（1-m—n）Fe（OH）3·mFezO3·nZnFe2O4·xH2O前驱体，微结构为大量螺旋状分子簇和少量亚晶结构，用XRD检测结果表明，前驱体在室温放置10和14个月的转化产物是Fe2O3，ZnFe2O4和Nin6Znn．Fe2O4；放置55个月的主要产物是Nin6Znn4Fe2O4。提出了分子簇演绎氢氧化物脱水，优先生成Fe2O3晶核，亚晶结构演绎新生态氧化物分子自组装的低温自发固相反应机理。

The precursor of Ni-Zn-Fe Hydroxide was prepared by the coprecipitation of aqueous solution of mole ratio Ni2＋：Zn2＋：Fe3＋ of 0.6：0.4：2.0 with OH-. The precursor was characterized by means of elemental analysis, EDS, FT1R, DSC, VSM and HRTEM. The results indicates that 0.6Ni（OH）2（H2O）075 ·（0.4-n）Zn（OH）2·2（1-m-n）Fe（OH）3 ·mFeO03· nZnFe2O4· xH2O were synthesized with the microstructure including a large amount of spiral molecular elusters and some subcrys- talline structures. X-ray diffraction pattern indicates that after storing for 10 and 14 months at room temperature, the pre- cursor transformated into Fe2O3, ZnFe2O4 and NiO6ZnO4Fe2O4, and NiO6ZnO4Fe2O4 for 55months. Reaction mechanisms in- eluding moleeular cluster interpretation hydroxide dehydration, priority generate Fe2O3 nuelei, sub-grain strueture inter- pretation of the new eco-oxide molecules spontaneous self-assembly of low-temperature solid-state were provided.