Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1570946 | Materials Characterization | 2014 | 6 Pages |
Abstract
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 20-40 nm. The NdAlO3 crystallized in rhombohedral perovskite structure with lattice parameters a = 5.3223 Ã
and c = 12.9292 Ã
. 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 4 h 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 ~ 10â 3 at 5 MHz, respectively.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Midhun Harilal, V. Manikantan Nair, P.R.S. Wariar, K.P. Padmasree, Mashitah M. Yusoff, Rajan Jose,