共查询到10条相似文献,搜索用时 62 毫秒
1.
采用非水性溶胶-凝胶法制备了Y^3+共掺杂的掺Er^3+:Al2O3粉末,Er^3+浓度为0.1和1.0mol%,Er^3+和Y^3+浓度比为1:0-10.X射线衍射和光致发光(PL)光谱结果表明:900℃烧结的掺0.1和1.0mol%Er^3+:Al2O3粉末为具有非晶化特征的γ和θ混合相结构,非晶化趋势随Y^3+共掺杂浓度增大而增加.掺0.1mol%Er^3+:Al2O3粉末,PL光谱强度和半高宽随掺Y^3+浓度增大无明显变化.掺1.0mol%Er^3+:Al2O3粉末,PL光谱强度和半高宽随掺Y^3+浓度增大而增加,10mol%Y^3+共掺杂粉末的发光强度提高50倍,约为掺0.1m01%Er^3+:Al2O3粉末的10倍,半高宽从77nm增至92nm.Y^3+共掺杂对较高浓度掺Er^3+:Al2O3粉末PL性能的增强作用归因于Y^3+对Er^3+在基体中的分散和配位结构多样性的提高. 相似文献
2.
采用溶胶-凝胶法首次合成出 MgY_(4-x-y-z)Si_3O_(13)∶Eu_z~(3+),Bi_y~(3+),Gd_x~(3+)系列发光体.其结构与ASTM 卡片记载的 MgY_4Si_3O_(13)的结构相同,属于六方晶系.在每 mol 基质中,Eu~(3+)、Bi~(3+)和 Gd~(3+)的最佳掺杂量分别为0.07,0.025和0.2mol.在发光体由非晶态向晶态的转变过程中,Eu~(3+)的发光强度和所处位置对称性都发生了显著变化.当基质以 Eu~(3+)、Bi~(3+)共掺杂时,Bi~(3+)的兰色发光和 Eu~(3+)的橙红色发光都很强,但 Bi~(3+)向 Eu~(3+)的能量传递效率很低,适量的 Gd~(3+)的加入可增强 Bi~(3+)对Eu~(3+)发光的敏化效果. 相似文献
3.
4.
The purpose of this study was to investigate the use of foam fractionation to recover valuable surfactant (SDS) and metal ion (Cd2+) in the permeate of micellar-enhanced ultrafiltration (MEUF). The effects of operating factors, such as time, air flow rate, feed flow rate, liquid height, foam height, feed surfactant concentration, ethanol concentration and temperature on separation characteristics were studied in the continuous operation. When the concentrations of surfactant (SDS) and metal ion (Cd2+) in the feed solution were 500 mg/L and 10 mg/L, an enrichment ratio of 3.1 was achieved for SDS along with 52% removal fraction, as well as 99.35% Cd2+ was removed, after optimization of different process parameters. As the optimized results, the air and liquid flow rates were 100 L/h and 5 L/h, liquid and foam heights were 45 cm and 66 cm, respectively, sparger pore size was 10 μm. The Cd2+ concentration in the effluent was lower than 0.1 mg/L which could meet the integrated wastewater discharge standard (the first grade of national discharge standards in China). 相似文献
5.
6.
7.
In3+Nb5+双取代钙钛矿型锂快离子导体Li3xLa0.67-xTiO3的研究 总被引:1,自引:0,他引:1
以Li3xLa0.67-xTiO3为母体,通过掺杂经高温固相反应制得了一系列新的锂快离子导体材料Li3xLa0.67-xInyTi1-2yNbyO3.利用X射线衍射分析和交流阻抗技术研究该系统的组成结构和电化学性能.结果表明体系合成温度降低,分解电压提高了;在x=0.10,y<0.050时,合成物为单一的钙钛矿固溶体,y≥0.050时,则存在In2O3杂相;该体系合成物在室温下有较高的电导率,可达5.81×10-4S/cm,活化能在20~30kJ/mol之间. 相似文献
8.
钇离子在P507作载体的支撑液膜中的传输 总被引:1,自引:1,他引:0
本文研究了转速、pH、P_(507)浓度,I—表面活性剂对P_(507)为载体的支撑液膜提取钇(Y~(3+))的影响,计算了P_(507)浓度增加时的各种膜阻力。 相似文献
9.
本文提出了荧光法测定强力霉素(DC)的新方法。强力霉素碱性降解后与铝离子形成强荧光的络合物,并据此进行荧光测定,其荧光强度在4.0×10~(-8)~7.0×10~(-6)mol/L 范围内与强力霉素浓度成正比,共存的其它四环素类抗菌素不干扰强力霉素的测定,测定的检测限为3.0×10~(-8)mol/L。此法用于血清和尿液中强力霉素的测定,回收率分别为93~97%和91%~99%。 相似文献