乙酸铵介质中金属锰与水反应制备高纯氢氧化锰

研究了乙酸铵介质中金属锰与水的反应，考察了反应过程中有关参数对反应速度的影响。研究证明，在乙酸铵介质中，金属锰可与水反应制备高纯氢氧化锰。实验结果表明：随着乙酸铵浓度的增加，反应速度加快，随着反应温度的升高反应速度反而减慢；锰粉单位表面积上的反应速度随反应时间的延长基本不变。     

Synthesis and Characterization of Quaternary Complex of Sm-CH_3C(CH_2OH)_2COOH-Phen

Asrareearthionshaveexcellentfluorescentproperty ,theirapplicationsandresearcheshavere ceivedunabatedattention .Aseriesofcomplexesofrareearthwithfluorescentpropertyhasbeensynthesized[1～ 4] .Throughorbitaltransitionofrareearthions ,UVlightabsorbedcanbechan…     

Hydrothermal synthesis of Y(OH)3, Y(OH)3:Eu3+ nanotubes and the photoluminescence of Y(OH)3:Eu3+,Y2O3:Eu3+

The phase and morphology transformation during the hydrothermal treating process of Y2O3 was evaluated with X-ray diffcrcnce (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle size and specific surface area determination.The results showed that the cubic Y2O3 did not transfer into hexagonal Y(OH)3 in pure water. Therefore, pure hexagonal Y(OH)3 with nanotube and microrod morphologies were obtained by hydrothermal treating Y2O3 at 150℃ for 12 h in 15 ml of 2 mol/L NaOH solution with and with-out PVA or PEG It was suggested that the characteristic preferential growth of Y(OH)3 was attributed to the structure anisotropy of hexahedron Y(OH)3. The addition of PVA or PEG could promote the forming process of nanotubes by selective adsorption on different crystal planes,which altered the growth rate along different directions and resulted in the diffusion limit of constructing ions in the center top of rods. Finally,Y(OH)3:Eu and Y2O3:Eu nanotubes were also synthesized by using this method, and their photoluminescence properties were evaluated.