Thermoluminescence properties of MgO:Al3+,Li+ prepared by microwave-assisted solution combustion method

2020 ◽  
Vol 582 ◽  
pp. 412008 ◽  
Author(s):  
S.J. Mofokeng ◽  
L.L. Noto ◽  
D.V. Mlotswa ◽  
V.R. Orante-Barrón ◽  
M.S. Dhlamini
Keyword(s):  
Combustion Method ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
Microwave Assisted

scholarly journals Microwave-Assisted Synthesis of Mixed Metal-Oxide Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Akrati Verma ◽  
Reena Dwivedi ◽  
R. Prasad ◽  
K. S. Bartwal
Keyword(s):  
Oxidation State ◽  
Combustion Method ◽  
Mixed Metal Oxide ◽  
Average Particle ◽  
Particle Sizes ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
Xps Spectra ◽  
Mixed Metal ◽  
Microwave Assisted

Nanoparticles of mixed metal oxides, ZrO2, ZrTiO4, and ZrV2O7 were prepared by microwave-assisted citrate sol-gel and solution combustion method. The prepared nanoparticles were characterized for their structural details using XRD and TEM techniques. The broadening of Raman bands is ascribed to local compositional fluctuations or local positional disordering produced due to random distribution of Zr4+ and Ti4+between equivalent sites. The XPS spectra confirm the incorporation of Ti in ZrO2 and suggest Zr as well as Ti in +4 oxidation state. Gelation and fast combustion seem to be the reason for smaller particle sizes. ZrV2O7 nanocrystalline material was synthesized by microwave- assisted solution combustion method. Low angle powder XRD measurements confirm the mesoporous nature of the prepared material. The effect of calcination temperature on the phase transformation of the materials has been investigated. Among tetragonal, monoclinic, and cubic phases, the monoclinic phase is predominant at higher calcinations temperature. The XPS confirms the incorporation of V2O5 in ZrO2 and suggests that Zr and V are in the same oxidation state (+4). The average particle sizes for ZrO2, ZrTiO4, and ZrV2O7 were found to be in the ranges of 5–10 nm, 2–5 nm, and 10–50 nm, respectively.

scholarly journals Synthesis, Characterization and Catalytic Activity of Ternary Oxide Catalysts Using the Microwave-Assisted Solution Combustion Method

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4607
Author(s):  
Kawthar Frikha ◽  
Lionel Limousy ◽  
Jamel Bouaziz ◽  
Kamel Chaari ◽  
Simona Bennici
Keyword(s):  
Transition Metal ◽  
Co Oxidation ◽  
Combustion Method ◽  
Oxide Catalysts ◽  
Metal Species ◽  
Ternary Oxide ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
Oxidation Activity ◽  
Microwave Assisted

Ni−Co−Al, Ni−Cu−Al and Co−Cu−Al ternary oxide catalysts, with a fixed 5 wt% transition metal loading, were prepared by the microwave-assisted solution combustion method and tested in CO oxidation. The bulk and surface properties of the catalysts were investigated, using XRD, N2 adsorption–desorption, SEM, XPS and TEM techniques. XRD, XPS and TEM results revealed that nickel and cobalt were present as spinels on the surface and in the bulk. Differently, copper was preferentially present in “bulk-like” CuO-segregated phases. No interaction between the couples of transition metal species was detected, and the introduction of Cu-containing precursors into the Ni−Al or Co−Al combustion systems was not effective in preventing the formation of NiAl2O4 and CoAl2O4 spinels in the Ni− or Co-containing catalysts. Copper-containing catalysts were the most active, indicating that copper oxides are the effective active species for improving the CO oxidation activity.

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