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We found an error in our previous report [Chin. Phys. Lett. 26(2009)077809] concerning the JCPDS data which was used to compare with our data. It should read as JCPDS No 21-1272 (α = 3.7850A, c = 9.5140A, c/α = 2.5140, and V = 136.30A^3),  相似文献   
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The Ag-doping effects on Ti02 nanoparticles are investigated by means of x-ray diffraction (XRD) and Raman scattering spectroscopy. XRD and Raman results indicate that Ag-doping stabilizes the rutile phase in TiO2. We find an Ag-doping induced lattice expansion in both anatase and rutile phases. The Ag-doping has different influences on the lattice distortion for anatase and rutile phases, that is, the e/a-value for the anatase phase decreases with 0.5% Ag-doping and then increases with 1~ Ag-doping while that for the rutile phase shows a gradual increase with increasing Ag-doping. We have ascribed the different variations of lattice distortion due to Ag-doping to the change of interracial interaction between the anatase and rutile phases induced by different Ag concentrations.  相似文献   
3.
吴雪炜  刘晓峻 《物理学报》2008,57(9):5500-5505
利用拉曼光谱和紫外—可见光漫反射吸收光谱研究了颗粒度为10—80 nm的钛酸锶纳米颗粒的界面层特性.研究发现,当样品颗粒度从80 nm减小至10 nm时,一阶极化TO2模的拉曼强度有显著增加,表明在样品边界层中存在由增强表面缺陷偶极子造成的微极化区.相反,一阶非极化TO3模的拉曼强度随颗粒度的减小而降低.同时,发现TO2和TO3模的频率随着颗粒度的减小而发生软化,表明Ti—O 键的键长随颗粒度减小而增加,与XRD观察到 关键词: 纳米钛酸锶颗粒 微极化区 晶格扩张 表面缺陷态  相似文献   
4.
吴雪炜  吴大建  刘晓峻 《物理学报》2010,59(7):4788-4793
利用X射线衍射谱、拉曼光谱和紫外-可见光吸收光谱研究了硼(氮、氟)掺杂对TiO2纳米颗粒光学性能的影响.X射线衍射谱和拉曼光谱结果表明,掺硼(氮、氟)对TiO2纳米颗粒的锐钛矿相晶体结构无明显影响,而其锐钛矿晶格出现畸变(c/a值增大),这被归因于掺杂原子对TiO2纳米颗粒表面氧原子缺位沿晶格c轴方向的占据.另外,掺硼(氮、氟)TiO2纳米颗粒吸收带红移与TiO相似文献   
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We investigate the photoinduced effects on the electronic structure for half-metallic ferromagnet CrO2 (Tc 390 K), in which the conducting electrons are totally polarized, by using the LSDA+U method. A significant change is found for the band structure and the density of states (DOS) for CrO2 under photo-excitation, especially for the Cr 3dt2g band: disappearance of the spin-split band, suggesting collapse of the half-metallic state. We ascribe the change of electronic structure under photo-excitation to the wider one-electron band W via the strong hybridization of the down-spin Cr 3d and O 2p states. Furthermore we discuss the magnetic properties under photo-excitation.  相似文献   
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