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Your search keyword '"Meijun, Li"' showing total 10 results
Start Over Author "Meijun, Li" Publisher american chemical society
10 results on '"Meijun, Li"'

2. Comparative study of the vanadium species in VAPO-5 and VAPSO-5 molecular sieves

Author

Jianqiang Yu, Meijun Li, Zhongmin Liu, Zhaochi Feng, Qin Xin, and Can Lim

Subjects
Raman spectroscopy -- Usage, Molecular sieves -- Research, Vanadium -- Structure, Vanadium -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

The nature and location of vanadium species between VAPO-5 and VAPSO-5 molecular sieves are comparatively studied using XRD, TG-DTA, NMR and UV resonance Raman spectroscopy. It is observed that the framework vanadium ions are formed in VAPSO-5 but are difficult to form in VAPO-5 and that the silicon ions in VAPO-5 play an important role in the formation of framework vanadium species.

Published
2002

3. UV Raman Spectroscopic study on TiO2. I. Phase transformation at the surface and in the bulkUV Raman Spectroscopic study on TiO2. I. Phase transformation at the surface and in the bulk

Author

Jing Zhang, Meijun Li, Zhaochi Feng, Jun Chen, and Can Li

Subjects
Titanium dioxide -- Thermal properties, Titanium dioxide -- Chemical properties, Raman spectroscopy -- Usage, Phase transformations (Statistical physics) -- Analysis, Chemicals, plastics and rubber industries
Abstract

Phase transformation of TiO2 from anatase to rutile is studied by UV Raman spectroscopy excited by 325 and 244 nm lasers, visible Raman spectroscopy excited by 532 nm laser, X-ray diffraction (XRD), and transmission electron microscopy (TEM). UV Raman spectroscopy is found to be more sensitive to the surface region of TiO2 than visible Raman spectroscopy and XRD because TiO2 strongly absorbs UV light.

Published
2006

4. Phase transformation in the surface region of zirconia detected by UV Raman Spectroscopy

Author

Meijun Li, Zhaochi Feng, Guang Xiong, Pinliang Ying, Qin Xin, and Can Li

Subjects
Raman spectroscopy -- Usage, Zirconium -- Research, Zirconium -- Chemical properties, Chemistry, Physical and theoretical -- Research, X-rays -- Diffraction, X-rays -- Usage, Chemicals, plastics and rubber industries
Abstract

The phase transformation of zirconia (ZrO2) using ultraviolet Raman spectroscopy (UVRS) together with visible Raman spectroscopy and XRD is studied. The results of UVRS, visible Raman spectroscopy, and XRD suggest that the phase transformation of ZrO2 from tetragonal to monoclinic takes place initially at the surface regions of ZrO2 particle.

Published
2001

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