Reaction mechanism of lanthanum nitrate-doped Mo–La material during solid–liquid spray doping processing

At three critical temperatures which were obtained by thermo-gravimetry-differential thermal analysis–differential scanning calorimetry（TG/DTG/DSC）curves of lanthanum nitrate crystal, the air thermal decomposition experiments and solid–liquid spray doping simulation procedures of lanthanum nitrate c...

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Bibliographic Details
Published in:Rare metals 2015-11, Vol.34 (11), p.814-817
Main Authors: Feng, Peng-Fa, Yang, Qin-Li, Dang, Xiao-Ming, Xi, Sha, Wang, Ya-Qi
Format: Article
Language:English
Subjects:
Biomaterials
Calorimetry
Chemistry and Materials Science
Crystals
Doping
Energy
Lanthanum
Materials Engineering
Materials Science
Metallic Materials
Molybdenum
Nanoscale Science and Technology
Nitrates
O2
Lanthan
Physical Chemistry
processing
Mo
Solid–liquid
spray
Sprayers
Sprays
X-ray diffraction
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Summary:At three critical temperatures which were obtained by thermo-gravimetry-differential thermal analysis–differential scanning calorimetry（TG/DTG/DSC）curves of lanthanum nitrate crystal, the air thermal decomposition experiments and solid–liquid spray doping simulation procedures of lanthanum nitrate crystal were carried out, and their products were analyzed by X-ray diffraction（XRD）. Meanwhile, the spray doping processing of Mo O2–50 wt% La（NO3）3composite powder was undergone with lanthanum nitrate solution as the dopant,and doped Mo O2powder was analyzed by XRD. The results demonstrate that during the traditional solid–liquid spray doping processing, lanthanum nitrate, in the form of either crystal or aqueous solution, would be converted into La（NO3）3á4H2O by the dehydration reaction, rather than be decomposed to La2O3and NO or NO2. Therefore, it is inferred that the oxynitride gas produced from the process is attributed to the decomposition of residual HNO3in lanthanum nitrate crystal. The source of HNO3is supported by the chemical composition of lanthanum nitrate crystal.
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-014-0422-0