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稀土及过渡金属替代M型钡铁氧体的磁性能韩雁冰1,王新庆21. 中国计量学院现代科技学院基础部2. 中国计量学院材料科学与工程学院摘 要:为系统研究稀土离子替代钡离子对M型钡铁氧体结构及磁性能的影响,用溶胶-凝胶法合成了稀土离子替代的Ba1-xRexFe12O19(x=0.05,Re=La3+,Pr3+,Nd3+,Sm3+,Gd3+,Dy3+,Yb3+).结果发现,样品的饱和磁化强度Ms基本上随离子半径减小而减小,而矫顽力Hc则与稀土离子轨道量子数变化趋势相同.在此基础上,为进一步改善样品磁性能,采用相同制备方法合成了Re3+Zn2+及Re3+Zn2+Mn2+复合替代M型钡铁氧体Ba1-xRexFe12-xZnxO19和Ba1-xRexFe12-xMn0.5xZn0.5xO19,研究了过渡金属离子锌离子......
Optical-transition properties of the Nd3+ ion in KLu(WO4)2 crystal王坤鹏1,王继扬21. National Center for Materials Service Safety, University of Science and Technology Beijing2. State Key Laboratory of Crystals Materials, Shandong University摘 要:Optical absorption and emission intensities of Nd3+ ion in KLu(WO4)2 crystal were investigated. Based on the Judd......
was around 250 nm.The reflection spectrum showed that there were several apparent characteristic absorption peaks and the intensity of these peaks enhanced with the increasing concentration of Nd3......
Effect of trivalent rare earth ions doping on the fluorescence properties of electron trapping materials SrS:Eu2+孙家跃,刘振兴,杜海燕College of Chemistry and Environmental Engineering,Beijing Technology and Business University摘 要:Trivalent rare-earth ions (La3+,Pr3+,Nd3+,Sm3+,Gd3+,Tb3+,Dy3+,Ho3+,Er3+,Tm3+,and Yb3+) were investigated as the codoped auxiliary......
Factors affecting afterglow properties of red-emitting phosphor MgSiO3:Mn2+,Nd3+ for luminescent fiber朱亚楠,葛明桥Key Laboratory of Eco-Textile of Ministry of Education,College of Textiles and Clothing,Jiangnan University摘 要:With stable physical properties,the rare-earth silicate phosphor of MgSiO3:Mn2+,Nd3+ is one of the suitable luminescent materials used......
attributed to the trace impurities of other luminescent lanthanide ions such as Eu3+, Nd3+and Er3+. This investigation confirmed Raman spectroscopy as a useful tool for detecting trace luminescent......
solid-state sintering method. The influences of Nd3+ substitution on the phase structure, dielectric properties,piezoelectric and ferroelectric properties of the ceramics were investigated. All the samples possess pure BaTiO3-type perovskite structure. MPB with orthorhombic and tetragonal phase coexist at around x = 0.03-0.04. Nd3+ doping decreases both Tc and TO-T to lower temperature. All......
会泽铅锌矿床环带状闪锌矿中主微量元素分布特征及其意义朱传威22. 中国科学院地球化学研究所矿床地球化学国家重点实验室摘 要:以会泽矿床中环带状闪锌矿为对象,通过EPMA和LA-ICP-MS等手段,研究环带状闪锌矿中主微量元素在单矿物尺度的空间和时间变化规律.结果表明,早期(深色)闪锌矿相对贫Cd富Fe,而晚期(浅色)闪锌矿相对富Cd贫Fe,流体中高Fe含量会抑制Cd进入闪锌矿晶格.同时,闪锌矿中Cd2+主要以直接替代Zn2+的形式进入闪锌矿中,而不需要与Fe2+耦合替代进入闪锌矿晶格.Ge和Cu具有极强的相......
应能的模拟计算,我们发现在不同的压力条件下结构水在林伍德石中的赋存机制不同.在低压条件下,V″″Si+4H*O机制最稳定,而在高压条件下,结构水更倾向于Mg空位取代机制,而这2种机制在所考虑的全部压力条件下都比反位取代机制Mg″Si+2H*O在能量上更稳定.对于在林伍德石晶格中同时存在3价离子Fe3+,Al3+,Sc3+,Lu3+,Y3+,Nd3+的情况下,含Al3+,Fe3+和Nd3+的体系中......
闪锌矿的颜色与Cd-Fe相关性的关系 邵树勋1,叶霖1,周家喜1,刘铁庚1 (1.中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵州,贵阳550002) 摘要: 闪锌矿是硫化矿床中常见重要金属矿物,是提炼锌的唯一的矿石原料.所以,人们非常重视,进行了广泛而又深入的研究.普遍认为闪锌矿颜色是其中的铁含量多少所致,但是,也有人认为是闪锌矿中多种杂质元素综合作用的结果.也有的学者提出是组成闪锌矿元素电子跳跃引起.不论那种认识是对与否. [全文内容正在添加中] ......