Optical Properties and Activation Energy of A Novel System of Cdte Nanoparticles Embedded in Phosphate Glass Matrix

We report growth and optical properties of a novel system of CdTe nanoparticls doped P2O5–Na2O–ZnO– Li2O glass matrix. We have investigated the effect of concentration, annealing time and temperature on the band gap and size of the CdTe semiconductor nanoparticles. In addition the effect of adding ZnO to the glass matrix on the growing of the nanoparticles has been investigated. We found that the addition of ZnO to the glass composition is strongly affecting the growth of the nanoparticles. On the other hand, we have calcu-lated the size polydispersity index which showed narrow size distribution for the prepared nanoparticles. Furthermore, we have estimated the activation energy of diffusion for the prepared CdTe nanoparticles which gave the activation energy with low value~ 44 kJ mol-1.

压铸AlSiFeMnMgCuSc-xZr合金的组织和力学性能

在非真空条件下,采用普通卧式压铸机制备了Al-9Si-0.6Fe-0.2Mn-0.2Mg-0.6Cu-0.3Sc-x Zr(x=0,0.1,0.2,0.3,质量分数,%)合金拉伸试样,并采用金相显微镜、扫描电镜、电子探针和电子万能材料试验机等手段研究了其铸态显微组织和力学性能。结果表明,Zr的加入增强了合金的组织细化和变质效果,合金的抗拉强度、伸长率和硬度值均随Zr含量的增加呈现先升后降的趋势。当加入质量分数为0.2%的Zr时,合金中初生α-Al相细化效果最好,由花朵状转变成细小的枝晶状;共晶Si相变质效果也达到最佳,由蠕虫状转变为颗粒状相;合金的铸态抗拉强度、伸长率和硬度(HV)达到最大值,分别为289.3 MPa、4.9%和114.3,拉伸断裂方式为韧性断裂。