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

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} showedmore » crystal field splitting of Nd ions. • Dielectric properties of the sintered NdAlO{sub 3} ceramics were studied.« less
Authors:
 [1] ;  [2] ; ;  [1] ;  [3] ;  [4] ;  [2] ;  [4]
  1. Department of Physics, University College, University of Kerala, Trivandrum 695 101 (India)
  2. (Malaysia)
  3. CINVESTAV, Saltillo (Mexico)
  4. Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, 26300 Kuantan, Pahang (Malaysia)
Publication Date:
OSTI Identifier:
22340342
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 90; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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