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Ma Y.-P.,Applied Materials | Ma Y.-P.,Hainan Provincial Key Laboratory of Research on Utilization of Si Zr Ti Resources | Ma Y.-P.,Hainan University | Li F.-F.,Jilin University
Gaoya Wuli Xuebao/Chinese Journal of High Pressure Physics | Year: 2012

In-situ high-pressure Raman study of the gypsum was carried out from 0 to 35 GPa with a diamond anvil cell (DAC). The authors determined the pressure dependences of the Raman bands of gypsum. A new Raman peak 1012 cm -1 in the stretching vibration of range is found at pressure of about 4.5 GPa, and its intensity is shown to strengthen with increasing pressure. So we can determine the occurrence of pressure-induced phase transition near 4.5 GPa.


Zhou S.-W.,Hunan University | Zhou S.-W.,Hainan University | Zhou S.-W.,Hainan Provincial Key Laboratory of Research on Utilization of Si Zr Ti Resources | Peng P.,Hunan University | Tang Y.-H.,Hunan University
Gongneng Cailiao/Journal of Functional Materials | Year: 2013

Using the first-principles pseudopotential plane-wave method based on density functional theory, the lattice parameters, electronic structures, charge populations, absorption spectra, and the band edge position of anatase TiO2 before and after Bi-N co-doping were calculated. The results indicate that the lattice distortion gives rise to the octahedral dipole moments when the crystal was doped. The dipole moment of Bi-N co-doping was more slightly than that of Bi/N single doping, which was very effective for the separation of photo-excited electron-hole pairs. With the valence band and the conduction band toward the lower energy direction in Bi-N co-doping model, the valence band broadens. It was beneficial to the mobility of photo-generated carriers; on the other hand, the band edge position of co-doping anatase TiO2 changes significantly and manifests more excellent redox capacity than that Bi/N single doping. Moreover the shallow impurity energy levels of acceptor level and donor level have formed between the valence band maximum and the conduct band minimum, which can increase the responsive range of the visible light. Therefore, the co-doping of TiO2 with Bi and N can effectively improve the photo-catalytic performance of TiO2 and enhance the utilization of the solar light.


Wang X.-H.,Hainan Provincial Key Laboratory of Research on Utilization of Si Zr Ti Resources | Wang X.-H.,Nanjing University of Science and Technology | Wang X.-H.,Chinese Academy of Sciences | Cao Y.,Hainan Provincial Key Laboratory of Research on Utilization of Si Zr Ti Resources | And 3 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2013

The TiO2 films on titanium substrates were fabricated by acid and alkaline. After the samples annealed at 450 and 700°C, different crystallinity and surface morphology of TiO2 films were obtained respectively. Such samples have been dipped into simulated body fluid (SBF) electrolyte, observed the hydroxyapatite deposition in their surfaces, and further researched MG-63 cell adhesion to explore their biological evaluation. The results show the sample annealed at 450°C has the best biological activity than those annealed at 700°C and unannealed for its morphology of nanoscale structure like flower mesh, and the sample annealed at 700°C has the worst biological activity than those annealed at 450°C and unannealed for its greater nanorod diameter and closer structure.

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