Synthesis of gadolinium aluminate powder through citrate gel route

Nanocrystalline gadolinium aluminate (GdAlO 3) powder was prepared through citrate gel route. The thermal decomposition behavior of gadolinium–aluminium–citrate–nitrate precursor powder was studied with the help of thermo gravimetric analysis combined with differential scanning calorimetry and mass...

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Bibliographic Details
Published in:Journal of alloys and compounds 2010-07, Vol.502 (2), p.396-400
Main Authors: Sinha, Amit, Sharma, B.P., Näfe, H., Gopalan, P.
Format: Article
Language:English
Subjects:
Aluminates
Ammonia
Carbon
Citrates
Citrate–nitrate
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Evolution
Exact sciences and technology
Gadolinium
Gadolinium aluminate
GdAlO3
HT-XRD
Mass spectrometry
Materials science
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Oxidizing atmospheres
Physics
Precursors
Rietveld analysis
TG–DSC
Thermal properties of condensed matter
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Summary:Nanocrystalline gadolinium aluminate (GdAlO 3) powder was prepared through citrate gel route. The thermal decomposition behavior of gadolinium–aluminium–citrate–nitrate precursor powder was studied with the help of thermo gravimetric analysis combined with differential scanning calorimetry and mass spectroscopy. The phase evolution of the powder at different temperatures was characterized by high-temperature X-ray diffraction. The decomposition of the precursor powder in oxidizing atmosphere was found to be a three-step process: (i) evolution of water and ammonia; (ii) evolution of carbon dioxide, residual water, and ammonia; (iii) oxidation of residual carbon. Calcination of precursor powder at 800 °C under static air was found to result in GdAlO 3 phase. In the absence of oxidizing atmosphere the amorphous precursor powder only partially crystallized into GdAlO 3 phase at 1200 °C.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2010.04.179