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Electrical and optical properties of NdAlO3 synthesized by an optimized combustion process
Nanocrystals of neodymium aluminate (NdAlO3) are synthesized using an optimized single step auto-ignition citrate complex combustion process. The combustion product was characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy a...
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Published in: | Materials characterization 2014-04, Vol.90, p.7-12 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Nanocrystals of neodymium aluminate (NdAlO3) are synthesized using an optimized single step auto-ignition citrate complex combustion process. The combustion product was characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy and Ultraviolet–visible reflection spectroscopy. The combustion product is single phase and composed of aggregates of nanocrystals of sizes in the range 20–40nm. The NdAlO3 crystallized in rhombohedral perovskite structure with lattice parameters a=5.3223Å and c=12.9292Å. The absorption spectrum of the NdAlO3 nanocrystals shows characteristic absorption bands of the Nd atom. The polycrystalline fluffy combustion product is sintered to high density (~97%) at ~1450°C for 4h and the microstructure was characterized by scanning electron microscopy. The electrical properties of the sintered product were studied using dielectric measurements. The sintered NdAlO3 has a dielectric constant (εr) and a dielectric loss (tan δ) of 21.9 and ~10−3 at 5MHz, respectively.
•NdAlO3 nanocrystals were synthesized through a citrate combustion process.•The nanocrystals were sintered to ~97% of theoretical density.•The materials were characterized using a number of analytical techniques.•Nanostructured NdAlO3 showed crystal field splitting of Nd ions.•Dielectric properties of the sintered NdAlO3 ceramics were studied. |
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ISSN: | 1044-5803 1873-4189 |
DOI: | 10.1016/j.matchar.2014.01.011 |