GROWTH AND SPECTROSCOPIC CHARACTERIZATION OF Mg:Ce:Cu:LiNbO3 CRYSTALS

2008 ◽  
Vol 22 (15) ◽  
pp. 1487-1495 ◽  
Author(s):  
YEXIA FAN ◽  
HONGTAO LI ◽  
LIANCHENG ZHAO
Keyword(s):  
Mass Spectrometry ◽  
Defect Structure ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Spectroscopic Characterization ◽  
Threshold Concentration ◽  
Ir Absorption ◽  
X Ray ◽  
Inductively Coupled

Congruent Ce (0.1 wt %): Cu (0.05 wt %): LiNbO 3 single crystals doped with 0, 1, 3, 4, 5, 6 mol% MgO respectively were grown by the Czochrolski method in air along the C direction. The inductively coupled plasma optical emission/mass spectrometry (ICP-OE/MS), the X-ray powder diffraction (XRD), the differential thermal analysis (DTA), the ultraviolet-visible (UV-Vis) absorption spectra and the infrared (IR) absorption spectrum were measured and discussed in terms of the spectroscopic characterization and the defect structure of the Mg:Ce:Cu:LiNbO 3 crystals. The results indicated that the Mg:Ce:Cu:LiNbO 3 crystal grown from the congruent composition melt showed large [ Li ]/[ Nb ] ratios, which was closer to stoichiometry, an increase in the Curie temperature and a non-linear shift in the absorption edge with MgO concentration increasing. The threshold concentration of MgO in Mg:Ce:Cu:LiNbO 3 of nearly 5.52 mol% was estimated.

scholarly journals Preparation of SAPO-34-Based Catalyst for Conversion of Fructose to 5-Hydroxymethylfurfural

2021 ◽  
Author(s):  
Yangyang Zhang ◽  
Chuan Shao ◽  
Dongling Qin ◽  
Gang Yang
Keyword(s):  
Inductively Coupled Plasma ◽  
Biomass Conversion ◽  
Maximum Yield ◽  
Optical Emission ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inductively Coupled ◽  
Acid Catalyzed ◽  
The Stability

Solid acid-catalyzed dehydration of fructose to produce 5-hydroxymethylfurfural (5-HMF) has been a hotspot in biomass conversion research in recent years. In this study, a novel SAPO‑34‑based catalyst was prepared by consecutive steps of titanium doping, sulfuric acid impregnation, and sulfonic acid functionalization. Characterization of the catalyst with X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), inductively coupled plasma optical emission spectrometer (ICP-OES), and acid-base titration revealed different pore structures and more acid content compared to SAPO‑34. The catalyst was applied to the preparation of 5-HMF by dehydration of fructose, and the maximum yield (74.0%) of 5-HMF was obtained by reacting in dimethyl sulfoxide (DMSO) at 170 °C for 50 min. In addition, the applicability of the catalytic system to other substrates and the stability of the catalyst after five cycles were investigated, which are valuable for further probing on the concerned aspects.

SYNTHESIS AND CHARACTERIZATION OF TERNARY AL-C-N COMPOUND

2002 ◽  
Vol 16 (06n07) ◽  
pp. 1132-1137 ◽  
Author(s):  
N. JIANG ◽  
S. XU ◽  
K. N. OSTRIKOV ◽  
E. L. TSAKADZE ◽  
J. D. LONG ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Flow Rate Ratio ◽  
In Situ Observation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inductively Coupled

An attempt for modification of carbon nitride material by introduction of Al to form a ternary Al-C-N compound in a thin film deposited using inductively coupled plasma (ICP) assisted DC magnetron sputtering is reported. Optical emission spectroscopy (OES) is used for in-situ observation and identification of reactive species. The films were characterized using x-ray photoelectron spectroscopy (XPS) and x-ray diffraction spectroscopy (XRD). The results indicate that C-N bond is formed in the plasma. The XPS narrow scam spectra confirm the existence of C-Al, sp2C-N and sp3C-N bonds. Elemental proportion of carbon increases with the CH4/N2 flow rate ratio, and has a tendency to saturate. The film is dominated by c-AlN (111), mixed with Al4C3 and AlCN ternary compound.

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