Electrical and optical properties of NdAlO{sub 3} synthesized by an optimized combustion process

Journal Article · Tue Apr 01 00:00:00 EDT 2014 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2014.01.011· OSTI ID:22340342

Harilal, Midhun ^[1]; Nair, V. Manikantan; Wariar, P. R.S. ^[1]; Padmasree, K. P. ^[2]; Yusoff, Mashitah M. ^[3]; Jose, Rajan ^[3]

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1. Department of Physics, University College, University of Kerala, Trivandrum 695 101 (India)
2. CINVESTAV, Saltillo (Mexico)
3. Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, 26300 Kuantan, Pahang (Malaysia)

Nanocrystals of neodymium aluminate (NdAlO{sub 3}) 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 NdAlO{sub 3} crystallized in rhombohedral perovskite structure with lattice parameters a = 5.3223 Å and c = 12.9292 Å. The absorption spectrum of the NdAlO{sub 3} 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 NdAlO{sub 3} has a dielectric constant (ε{sub r}) and a dielectric loss (tan δ) of 21.9 and ∼ 10{sup −3} at 5 MHz, respectively. - Highlights: • NdAlO{sub 3} 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 NdAlO{sub 3} showed crystal field splitting of Nd ions. • Dielectric properties of the sintered NdAlO{sub 3} ceramics were studied.

• OSTI ID: 22340342
• Journal Information: Materials Characterization, Vol. 90; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
ABSORPTION SPECTRA
ALUMINATES
CERAMICS
COMBUSTION
DENSITY
DIELECTRIC MATERIALS
FOURIER TRANSFORM SPECTROMETERS
LATTICE PARAMETERS
NANOSTRUCTURES
NEODYMIUM COMPOUNDS
NEODYMIUM IONS
OPTICAL PROPERTIES
PERMITTIVITY
PEROVSKITE
POLYCRYSTALS
RAMAN SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION