Core-shell-structure Ag-BaTiO3 composite nanopowders prepared directly by flame spray pyrolysis

Seung Ho Choi, You Na Ko, Jung Kul Lee, Byung Kyu Park, Yun Chan Kang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Core-shell-structure Ag-BaTiO3 composite nanopowders are prepared directly by flame spray pyrolysis. The single-crystalline Ag was located in the core part of the composite powder, and the Ba and Ti components are uniformly distributed in the shell part. The X-ray diffraction (XRD) patterns of the Ag-BaTiO3 composite powders have the main crystal peaks of Ag and broad peaks at around 28. The Ag-BaTiO3 pellets with low Ag contents (below 20 wt%) have a dense structure and fine grain size. Abnormal grain growth of the Ag(30 wt%)-BaTiO3 pellets occurs even at a low sintering temperature of 1000 °C. The Ag-BaTiO3 pellet had a mixed crystal structure of BaTiO3 and Ag phases. Silver is uniformly distributed in the BaTiO3 matrix without phase separation. The dielectric constants of the BaTiO3, Ag(10 wt%)-BaTiO3, and Ag(30 wt%)-BaTiO3 pellets are 830, 2130, and 4680, respectively.

Original languageEnglish
Pages (from-to)266-272
Number of pages7
JournalMaterials Chemistry and Physics
Volume140
Issue number1
DOIs
Publication statusPublished - 2013 Jun 15
Externally publishedYes

Fingerprint

Spray pyrolysis
pellets
pyrolysis
sprayers
flames
Powders
composite materials
Composite materials
Grain growth
Silver
Phase separation
Diffraction patterns
mixed crystals
Permittivity
Sintering
Crystal structure
Crystalline materials
X ray diffraction
sintering
Crystals

Keywords

  • Composite materials Chemical synthesis Dielectric properties Nanostructures

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Core-shell-structure Ag-BaTiO3 composite nanopowders prepared directly by flame spray pyrolysis. / Choi, Seung Ho; Ko, You Na; Lee, Jung Kul; Park, Byung Kyu; Kang, Yun Chan.

In: Materials Chemistry and Physics, Vol. 140, No. 1, 15.06.2013, p. 266-272.

Research output: Contribution to journalArticle

Choi, Seung Ho ; Ko, You Na ; Lee, Jung Kul ; Park, Byung Kyu ; Kang, Yun Chan. / Core-shell-structure Ag-BaTiO3 composite nanopowders prepared directly by flame spray pyrolysis. In: Materials Chemistry and Physics. 2013 ; Vol. 140, No. 1. pp. 266-272.
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