Nanocrystalline CaCu3Ti4O12 powders prepared by egg white solution route: Synthesis, characterization and its giant dielectric properties

C. Masingboon, S. Maensiri, T. Yamwong, P. L. Anderson, Supapan Seraphin

Research output: Contribution to journalArticle

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Abstract

Nanocrystalline CaCu3Ti4O12 powders with particle sizes of 50-90 nm were synthesized by a simple method using Ca(NO 3)2•4H2O, Cu(NO3) 2•4H2O, titanium(diisoproproxide) bis(2,4-pentanedionate) and freshly extracted egg white (ovalbumin) in aqueous medium. The synthesized precursor was characterized by TG-DTA to determine the thermal decomposition and crystallization temperature which was found to be at above 400 °C. The precursor was calcined at 700 and 800 °C in air for 8 h to obtain nanocrystalline powders of CaCu3Ti4O 12. The calcined CaCu3Ti4O12 powders were characterized by XRD, FTIR, SEM and TEM. Sintering of the powders was conducted in air at 1100 °C for 16 h. The XRD results indicated that all sintered samples have a typical perovskite CaCu3Ti4O 12 structure and a small amount of CuO, although the sintered sample of the 700 °C calcined powders contained some amount of CaTiO3. SEM micrographs showed the average grain sizes of 12.0±7.8 and 15.5±8.9 μm for the sintered CaCu3Ti4O 12 ceramics prepared using the CaCu3Ti4O 12 powders calcined at 700 and 800 °C, respectively. The sintered samples exhibit a giant dielectric constant, ε′ of ∼1.5-5×104. The dielectric behavior of both samples exhibits Debye-like relaxation, and can be explained based on a Maxwell-Wagner model.

Original languageEnglish (US)
Pages (from-to)87-95
Number of pages9
JournalApplied Physics A: Materials Science and Processing
Volume91
Issue number1
DOIs
StatePublished - Apr 2008

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Nanocrystalline powders
eggs
Dielectric properties
Powders
dielectric properties
routes
synthesis
Scanning electron microscopy
Ovalbumin
Crystallization
Air
Titanium
Perovskite
Differential thermal analysis
scanning electron microscopy
Pyrolysis
Permittivity
Sintering
air
Particle size

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Nanocrystalline CaCu3Ti4O12 powders prepared by egg white solution route : Synthesis, characterization and its giant dielectric properties. / Masingboon, C.; Maensiri, S.; Yamwong, T.; Anderson, P. L.; Seraphin, Supapan.

In: Applied Physics A: Materials Science and Processing, Vol. 91, No. 1, 04.2008, p. 87-95.

Research output: Contribution to journalArticle

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