Preparation, characterization, electrical properties and giant dielectric response in (In plus Nb) co-doped TiO2 ceramics synthesized by a urea chemical-combustion method. Nachaithong, T. & Thongbai, P. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, 28(15):10914-10920, AUG, 2017.
doi  abstract   bibtex   
Pure rutile phase of nanocrystalline (In + Nb) co-doped TiO2 (INTO) ceramics were prepared by a chemical combustion method using urea as fuel. Dense ceramic microstructure can be obtained by sintering INTO nanocrystalline powders. Good dispersion of In3+ and Nb5+ co-doping ions in the microstructure is observed. Notably, high dielectric permittivity (ae20,674) and low loss tangent (ae0.054) at a low frequency and 30 A degrees C are achieved in the (In1/2Nb1/2)(0.015)Ti0.985O2 ceramic. Using an impedance spectroscopy, the INTO ceramics are confirmed to be electrically heterogeneous, consisting of semiconducting and insulating phases. The giant dielectric response in INTO ceramics can suitably be explained by the interfacial polarization. The low value of the loss tangent of INTO ceramics is attributed to a large value of resistivity of insulating phase.
@article{ ISI:000405101700017,
Author = {Nachaithong, Theeranuch and Thongbai, Prasit},
Title = {{Preparation, characterization, electrical properties and giant
   dielectric response in (In plus Nb) co-doped TiO2 ceramics synthesized
   by a urea chemical-combustion method}},
Journal = {{JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS}},
Year = {{2017}},
Volume = {{28}},
Number = {{15}},
Pages = {{10914-10920}},
Month = {{AUG}},
Abstract = {{Pure rutile phase of nanocrystalline (In + Nb) co-doped TiO2 (INTO)
   ceramics were prepared by a chemical combustion method using urea as
   fuel. Dense ceramic microstructure can be obtained by sintering INTO
   nanocrystalline powders. Good dispersion of In3+ and Nb5+ co-doping ions
   in the microstructure is observed. Notably, high dielectric permittivity
   (ae20,674) and low loss tangent (ae0.054) at a low frequency and 30 A
   degrees C are achieved in the (In1/2Nb1/2)(0.015)Ti0.985O2 ceramic.
   Using an impedance spectroscopy, the INTO ceramics are confirmed to be
   electrically heterogeneous, consisting of semiconducting and insulating
   phases. The giant dielectric response in INTO ceramics can suitably be
   explained by the interfacial polarization. The low value of the loss
   tangent of INTO ceramics is attributed to a large value of resistivity
   of insulating phase.}},
DOI = {{10.1007/s10854-017-6871-0}},
ISSN = {{0957-4522}},
EISSN = {{1573-482X}},
Unique-ID = {{ISI:000405101700017}},
}
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