Sintering behavior and mechanism of tungsten powders prepared by solution combustion synthesis combined with hydrogen reduction

This work reports the preparation of La2O3 uniformly doped Mo nanopowders with the particle sizes of 40–70 nm by solution combustion synthesis and subsequent hydrogen reduction (SCSHR). To reach this aim, the foam-like MoO2 precursors (20–40 nm in size) with different amounts of La2O3 were first synthesized by a solution combustion synthesis method. Next, these precursors were used to prepare La2O3 doped Mo nanopowders through hydrogen reduction. Thus, the content of La2O3 used for doping can be accurately controlled via the SCSHR route to obtain the desired loading degree. The successful doping of La2O3 into Mo nanopowders with uniform distribution were proved by X-ray photon spectroscopy and transmission electron microscopy. The preservation of the original morphology and size of the MoO2 precursor by the La2O3 doped Mo nanopowders was attributed to the pseudomorphic transport mechanism occurring at 600 °C. As shown by X-ray diffraction, the formation of Mo2C impurity, which usually occurs in the direct H2 reduction process, can be avoided by using the Ar calcination-H2 reduction process, when residual carbon is removed by the carbothermal reaction during Ar calcination at 500 °C.

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Magnetic iron nanoparticles prepared by solution combustion synthesis and hydrogen reduction

Chemical Physics Letters ◽

10.1016/j.cplett.2016.05.043 ◽

2016 ◽

Vol 657 ◽

pp. 33-38 ◽

Cited By ~ 12

Author(s):

Min Huang ◽

Mingli Qin ◽

Zhiqin Cao ◽

Baorui Jia ◽

Pengqi Chen ◽

...

Keyword(s):

Combustion Synthesis ◽

Iron Nanoparticles ◽

Hydrogen Reduction ◽

Solution Combustion Synthesis ◽

Solution Combustion

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Solution-Combustion Synthesis and Study of : γ-Fe2-xCrxO3(0.75 ≤ x ≤ 1.25) Maghemite-like Materials

10.1557/proc-1148-pp01-09 ◽

2008 ◽

Author(s):

Emilio Moran ◽

Miguel ïngel. Alario-Franco ◽

Marco L. Garcia-Guaderrama ◽

Oscar Blanco

Keyword(s):

Combustion Synthesis ◽

Solution Combustion Synthesis ◽

Solution Combustion

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A Facile Microwave-Assisted Solution Combustion Synthesis of Highly Stable Magnesium Oxide for Multicomponent Mannich Reaction

Current Catalysis ◽

10.2174/2211544711201030164 ◽

2012 ◽

Vol 1 (3) ◽

pp. 164-170 ◽

Cited By ~ 1

Author(s):

Lankela H. Reddy ◽

Gunugunuri K. Reddy ◽

Boningari Thirupathi ◽

Benjaram M. Reddy

Keyword(s):

Combustion Synthesis ◽

Magnesium Oxide ◽

Mannich Reaction ◽

Solution Combustion Synthesis ◽

Solution Combustion ◽

Microwave Assisted

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Effect of Nitric Acid Modification on LiMn2O4 Prepared by Solution Combustion Synthesis

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.80-81.332 ◽

2011 ◽

Vol 80-81 ◽

pp. 332-336 ◽

Cited By ~ 1

Author(s):

Yan Xia ◽

Mei Huang ◽

Jun Ming Guo ◽

Ying Jie Zhang

Keyword(s):

Nitric Acid ◽

Combustion Synthesis ◽

Discharge Capacity ◽

Retention Rate ◽

Solution Combustion Synthesis ◽

Manganese Acetate ◽

Solution Combustion ◽

Acid Modification ◽

Capacity Retention ◽

Liquid Combustion

Effect of nitric acid and the burning time on the liquid combustion synthesis of spinel LiMn2O4 has been studied, using lithium nitrite and Manganese acetate as raw a material. The results show that the main phases are all LiMn2O4, which can be obtained at 400-600 oC. Before modified, the impurity is Mn3O4 or Mn2O3. After modified, the impurity is only Mn3O4. The aggregation obviously reduced after adding nitric acid, it is indicated that the crystalline increased. With the increasing temperatures, the modified particle size was increased and the aggregation reduced. The initial discharge capacity and cycle stability improved at some extent too. Its first discharge capacity was 104.6, 112.8 and 117.7mAh/g synthesized at 400, 500, 600 oC, respectively, and the 30th capacity retention rate were 84.89%, 80.67% and 73.24%.

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