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Jin C.-G.,Wuhan University | Li Z.,Wuhan University | Zhang C.-L.,Guilin Research Institute of Geology for Mineral Resources | Huang L.-X.,CAS Fujian Institute of Research on the Structure of Matter | Xie H.,Wuhan University
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2011

The content and distribution of niobium, crystal structure and the characteristic peaks of chemical bond in the Nb: KTP crystals grown by flux and hydrothermal method were investigated by LA-ICP-MS, X-ray diffraction analysis, micro laser Raman spectroscopy. The effects of niobium doped and crystal growth methods on structure and Raman spectrum of Nb:KTP crystals were analyzed. The results show that the stoichiometry of potassium reduced as niobium doped content increasing in Nb:KTP crystals. The unit cell volume is under the control of synergistic reaction by blockage effect and expansion effect. The unit cell volume in crystals grown by flux method is bigger than those grown by hydrothermal method when the raw material mixture ratio is same, so the growth method could be distinguished by unit cell volume. The interaction of TiO 6 octahedral and PO 4 tetrahedral is changing after Nb entered crystal lattice, thus, a few of characteristic peaks are drift. Source


Yang S.-X.,JiShou University | Yuan Z.-Z.,JiShou University | Li Z.-Y.,JiShou University | Long H.,JiShou University | Tang W.-J.,Guilin Research Institute of Geology for Mineral Resources
Huanjing Kexue/Environmental Science | Year: 2012

An extensive sampling was conducted from 4 Manganese mine sites and 5 Lead/Zinc mine sites in Huayuan, Xiangxi. The total and diethylenetriaminepentaacetic (DTPA)-extractable heavy metal (Mn, Pb, Zn, Cu and Cd) concentrations were determined and the heavy metal contamination of mine soils was assessed with pollution index. A principal component analysis (PCA) was performed to identify the key parameters and a simple linear regression was employed to evaluate the relationships between the total and DTPA-extractable heavy metals. The results showed the following: (1) The mine soils were characterized by elevated levels of Mn, Pb and Cd in terms of Hunan soil background concentrations, being 8.7, 21.5 and 2.9 times of their local soil background values, respectively. According to China Environmental Quality Standard for Soils (GB 15618-1995), most Pb and Cd exceeded the threshold values of Class III. (2) Pollution index showed the mine soil was slightly polluted by Pb and moderately to severely polluted by Cd. Comprehensive pollution index indicated slight to moderate pollution for Manganese mine and moderate to severe pollution for Lead/Zinc mine, respectively. (3) The DTPA-extractable Pb and Cd concentrations were relatively high in Manganese and Lead/zinc mine soils and their fractions in comparison to the total metal concentrations exceeded 10%. A significant positive correlation was observed between DTPA-extractable and total concentrations of soil Mn, Pb, Zn and Cd (P<0.01). The principal component analysis showed the total and DTPA-extractable Mn, Pb, Zn and Cd were the key factors resulting heavy metal contamination of mine soils. Therefore, various protective measures should be taken to avoid heavy metal contamination. Source


Zhang H.,East China Institute of Technology | Cao J.,Guilin Research Institute of Geology for Mineral Resources | Sun H.,East China Institute of Technology
Dizhen Dizhi | Year: 2010

Using experimental techniques, the paper investigates the transmitted magnetic moment, the turnoff time, and the change of induced signal with the turns of the transmitter and receiver loops of multiturn small coincident configuration, respectively. Comparison is made between the two experimental methods, i. e. changing the receiver loop turns with fixed transmitter loop turns and vice versa, to find out the turns more suitable to geological response. Meanwhile, comparative test is done using the wire frame of loop length of 0. 5m × 0.5m and 1m ×1m, respectively. Through the analyses on the transmitted magnetic moment, the turn-off time, the relations of induced signal intensity with the loop turns and the length, we find the reasonable small multi-turn coincident loop configuration. The result indicates that the transmitted magnetic moment increases with the increased transmitter loop turns and length; the turn-off time increases proportionally with the transmitter loop turns, but has nothing to do with the receiver loop; and the induced signal intensity has a proportional relation with loop turns, with the receiver loop turn to be dominant, comparatively. Source


Mou X.-S.,CAS Technical Institute of Physics and Chemistry | Mou X.-S.,University of Chinese Academy of Sciences | Hu Z.-G.,CAS Technical Institute of Physics and Chemistry | Zhang C.-L.,Guilin Research Institute of Geology for Mineral Resources
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2010

CaB8O11(OH)4 crystal was synthesized within hydrothermal system of CaO-H3BO3-H2O during 280-350 °C using H3BO3 and CaO as raw materials. It was characterized by the following tests-XRD, TG-DSC, FT-IR, SHG and UV-Vis-NIR. The output of SHG equals to 1-2 times of KDP with the same size of grain and the structural aspects was discussed. The transmittance between 320 and 750 nm was up to 80%. Source


Li X.,CAS Technical Institute of Physics and Chemistry | Li X.,University of Chinese Academy of Sciences | Hu Z.,CAS Technical Institute of Physics and Chemistry | Lu T.,CAS Technical Institute of Physics and Chemistry | And 2 more authors.
Optical Engineering | Year: 2012

Potassium titanyl phosphate (KTP) is mostly used in all-solidstatelasers as a good nonlinear optical crystal. Knowledge of variations inthe weak absorption of different types of KTP crystals is important forthe application. In this study, the flux-grown KTP crystals with titanium from TiO2, TiCl 4, and Ti(OC4H9)4, respectively, and the hydrothermal grown KTP crystal were investigated. The weak absorption values of the KTP crystals were measured at 1064 nm and 532 nm by photothermal common-path interferometer. The weak absorption values of four samples were 100 ppm cm-1, 800 ppm cm-1, 45 ppm cm-1,1064 ppm cm-1 at 1064 nm, and 2.6 × 104 ppm cm-1, 1.6× 105 ppm cm-1, 1.2 × 104 ppm cm-1, 2.25 × 102 ppm cm-1 at 532 nm, respectively. The results showed that the weak absorption values of the flux-grown KTP with titanium from Ti(OC4H9)4 and the hydrothermal-grown KTP were low values at 1064 nm. In addition, the weak absorption value of the hydrothermal-grown KTP was at least two orders of magnitude lower than that of the flux-grown KTP at 532 nm. From the results, we concluded that the KTP grown by titanium from Ti(OC4H 9)4 represented a better quality than the other two flux-grown KTP crystals. The quality of the hydrothermal-grown KTP was obviously better than the flux-grown KTP. © 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). Source

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