scholarly journals Effects of Transition Metal Ions on the Colour of Blue-Green Beryl

Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 86
Author(s):  
Hui Wang ◽  
Qiyun Guan ◽  
Yuchong Liu ◽  
Ying Guo
Keyword(s):  
Charge Transfer ◽  
Transition Metal ◽  
Metal Ions ◽  
Total Content ◽  
Transition Metal Ions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Industrial Cameras ◽  
Cielab Colour

This study reports the effects of transition metal ions on the colour of blue-green beryl. Industrial cameras were used to measure colour in the CIELAB colour space. X-ray fluorescence (XRF), X-ray diffraction (XRD), infrared spectroscopy (IR), and ultraviolet-visible (UV–vis) spectroscopy were used for characterization. The d–d transition of Fe3+ with sixfold coordination, the O2−→Fe3+ charge transfer, and the charge transition of binuclear metal M–M complexes formed by [Fe2(OH)4]2+ in the channel caused a yellow tone, whereas the charge transfer of Fe2+/Fe3+ with sixfold coordination caused a blue-green tone. The chroma of blue-green beryl was negatively correlated with the ratio of Cs+Mn to Fe contents. The lightness of blue-green beryl was negatively correlated with the total content of transition metal ions.

Characterization on the Microstructures and Optical Performances of TiO2 Doped with Transition Metals

2014 ◽  
Vol 887-888 ◽  
pp. 388-394 ◽  
Author(s):  
Xin Hua Liu ◽  
Yi Deng ◽  
Yu Chuan Zhang ◽  
Yin Hang Zhou
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Photoelectron Spectroscopy ◽  
Transition Metal Ions ◽  
Ultraviolet Region ◽  
Visible Light Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Light Region ◽  
Cu Ions

The structures and optical performances of TiO2doped with 4thperiodic transition metal ions were investigated in this paper. The characterization results of X-ray photoelectron spectroscopy and X-ray diffraction showed that the transition metal ions existed in oxidative states, and composites formed because of the reaction between doped metal ions and TiO2. The absorption spectroscopy of TiO2doped with zinc was mainly in ultraviolet region, close to that of the pure TiO2. While for TiO2doped with other transition metal ions including V, Cr, Mn, Fe, Co, Ni and Cu ions, the absorption spectroscopies covered ultraviolet region and visible light region, much broader than that of the pure TiO2.

scholarly journals The migration mechanism of transition metal ions in LiNi0.5Mn1.5O4

2015 ◽  
Vol 3 (24) ◽  
pp. 13031-13038 ◽  
Author(s):  
Gui-Liang Xu ◽  
Yan Qin ◽  
Yang Ren ◽  
Lu Cai ◽  
Ke An ◽  
...  
Keyword(s):  
Transition Metal ◽  
Neutron Diffraction ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Migration Mechanism

In situ high-energy X-ray diffraction and neutron diffraction were deployed to trace the migration of transition metal ions in LiNi0.5Mn1.5O4.

Photocatalytic Activity of Zeolite Supported Transition Metal-(Co2+ and Cr2+) Doped ZnO: Comparative Study

2015 ◽  
Vol 827 ◽  
pp. 43-48
Author(s):  
Annisa Noorhidayati ◽  
Mia Putri Rahmawati ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Transition Metal ◽  
Zno Nanoparticles ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Transition Metal Ions ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation

Transition metal ions (Co and Cr) doped ZnO nanoparticles supported on natural zeolite were synthesized using co-precipitation method. The synthesized samples were characterized by means of X-ray diffraction, energy dispersive X-ray, Fourier-transform infrared absorption, and UV-visible diffuse reflectance spectroscopy. The samples were further used as photocatalyst for degradation of methyl orange and methylene blue in aqueous solutions under UV light irradiation. The results showed that zeolite supported Cr-doped ZnO nanoparticles is more efficient compared with zeolite supported Co-doped ZnO nanoparticles. It is also revealed that zeolite supported samples possessed higher photocatalytic efficiency compared to bare samples.

Synthesis, X-ray characterization, DFT calculations and Hirshfeld surface analysis of thiosemicarbazone complexes of Mn+ ions (n = 2, 3; M = Ni, Cd, Mn, Co and Cu)

CrystEngComm ◽  
2016 ◽  
Vol 18 (6) ◽  
pp. 1009-1023 ◽  
Author(s):  
Ghodrat Mahmoudi ◽  
Alfonso Castiñeiras ◽  
Piotr Garczarek ◽  
Antonio Bauzá ◽  
Arnold L. Rheingold ◽  
...  
Keyword(s):  
Transition Metal ◽  
Dft Calculations ◽  
Metal Ions ◽  
Surface Analysis ◽  
Transition Metal Ions ◽  
Hirshfeld Surface ◽  
Hirshfeld Surface Analysis ◽  
X Ray ◽  
Thiosemicarbazone Complexes

Herein we report the synthesis, X-ray characterization, DFT calculations and Hirshfeld surface analysis of seven complexes of transition metal ions with pyridine-based thiosemicarbazone ligands.

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