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1.
非均相电解Mn^2+的电极过程动力学研究   总被引:7,自引:0,他引:7  
胡万里  苏彤 《电化学》1998,4(3):273-279
选择Pb-Sb-As合金为研究电极,通过阳极极化曲线确定了非均相电解氧化Mn62+电极过程机理,即为在阳极上存在液相和固相两个反应;并确定了40%H2SO4介质中Mn/Mn体系的条件电极电势为0.886V。采用旋转圆盘电极研究得到在非均相电解MnSO4过程中电极过程控制步骤为电荷传递-浓度极化混合控制步骤,并确定了电极反应的动力学参数。  相似文献   

2.
二氧化锰中Mn^2+Mn^3+Mn4^+测定方法的研究及应用   总被引:5,自引:0,他引:5  
研究了用选择性溶解法和计算法测定二氧化锰中Mn^2+、Mn^3+、Mn^4+,进而求得二氧化锰中的氧锰摩尔比,并且对这两种方法进行了比较。选择性溶解法能方便地测定Mn^2+、Mn^3+和Mn^4+,但需要严格控制其溶解条件,计算法则通过乙酰丙酮碘量法测定Mn^3+存在下的Mn^4+,有效地消除了Mn^3+的干扰,经过计算可以得到准确的结果,两者结果均与X射线衍射法谱图相吻合,对电容器阴极材料二氧化  相似文献   

3.
4.
Eu^2+和Mn^2+在SrMgP2O7中的光致发光及其能量传递   总被引:1,自引:1,他引:0  
研究了Eu^2+、Mn^2+共激活的SrMgP2O7的发光性质、浓度与荧光性质的关系,Eu^2+和Mn^2+的发射光谱分别在400nm及670nm附近,它们是Eu^2+的5d-4f跃迁和Mn^2+的^4T1(^4G)-^6A1g(^6S)跃迁发射,实验结果表明,Eu^2+对Mn^2+的荧光发射有较强的敏化作用,Mn^2+对Eu^2+的荧光寿命和强度也有显著影响。  相似文献   

5.
Eu^2+和Mn^2+在Sr3MgSi2O8中的光致发光研究   总被引:8,自引:1,他引:7  
研究了Eu^2+和Mn^2+共激活的Sr3MgSi2O8的荧光性质。Eu^2+和Mn^2+在460nm和690nm的发射峰分别由Eu^2+的5d→4f跃迁和Mn^2+的^4T1(^4G)→^6A1g(^6S)跃迁产生。未观察到单掺杂Mn^2+的Sr3MgSi2O8的荧光发射,而掺入Eu^2+后则出现了Mn^2+的690nm光致发光峰,表明Eu^2+对Mn^2+有敏化作用。Eu^2+的荧光寿命也受M  相似文献   

6.
Ca2B2O5中Ce^3+,Mn^2+的发光与能量传递   总被引:2,自引:0,他引:2  
本文研究了Ca_2B_2O_5中Ce~(3+)、Mn~(2+)光致发光的性质与其含量的关系,并讨论了Ce~(3+)对Mn~(2+)的能量传递机理.  相似文献   

7.
Eu^2+,Mn^2+共激活碱土镁硅酸盐基红色荧光粉的发光性能   总被引:10,自引:0,他引:10  
制备了以R3MgSi2O8(R=Ba,Sr,Ca)为基,Eu^2 ,Mn^2 共激活的红色荧光粉并研究了其荧光性质。分别以Ba3MgSi2O8,Sr3MgSi2O8,Ca3MgSi2O8为基质时,由于晶体场环境不同,发光强度、发射峰产生相应变化。研究了以(Ba,Sr)3MgSi2O8为基的荧光粉中Ba,Sr相对量,及Eu^2 ,Mn^2 浓度对发光性质的影响并探讨了Eu^2 ,Mn^2 在基质中所处格位;结果表明,红光是由基质中处于九配位的Eu^2 将能量传递给八面体六配位的Mn^2 ,而由Mn^2 所发射的。  相似文献   

8.
In this paper, the adsorption of Ag^+ and hydrated Ag^+ cations on clean Si(111) surface were investigated by using cluster (Gaussian 03) and periodic (DMol^3) ab initio calculations. Si(111) surface was described with cluster models (Si14H17 and Si22H21) and a four-silicon layer slab with periodic boundary conditions. The effect of basis set superposition error (BSSE) was taken into account by applying the counterpoise correction. The calculated results indicated that the binding energies between hydrated Ag^+ cations and clean Si(111) surface are large, suggesting a strong interaction between hydrated Ag^+ cations and the semiconductor surface. With the increase of number, water molecules form hydrogen bond network with one another and only one water molecule binds directly to the Ag^+ cation. The Ag^+ cation in aqueous solution will safely attach to the clean Si(111) surface.  相似文献   

9.
In this paper,zinc acetate,manganese acetate and thiacetamide are used as raw materials to successfully synthesize monodispersed ZnS:Mn2+ microspheres by using hydrothermal method and taking P123 surfactant as a template. The products were characterized by XRD,STEM,FT-IR and N2 adsorption-desorption. And the results show that the diameter of this microsphere is 1.0 μm or so,which is larger than that of ZnS microsphere without Mn2+ doping,and it has monodispersion,smooth surface and uniform size. The doping of Mn2+ does not obviously change the structure of monodispersed ZnS microsphere. The photoluminescence peak lies in a wide band ranging from 450 to 650 nm,and the microspheres emit orange light; with the increase of Mn2+ concentration,fluorescence intensity of ZnS:Mn2+ microsphere changes,and when the mole ratio of Mn2+:Zn2+ is 0.3:1,the fluorescence intensity is the strongest.  相似文献   

10.
邵振忠  邵军 《化学通报》1992,(10):46-48
EPR谱学是研究含有未配对电子物质结构的强有力工具,伹很多实验的谱图较复杂和不规范,使EPR谱图有关参数不易求解和解释,而Mn升:Cao体系谱图简单规范,易用EPR基本知识和量子化学微扰及算符知识予以解析  相似文献   

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