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 journalArticlepeer-review

4 Citations (Scopus)


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
Issue number1
Publication statusPublished - 2013 Jun 15
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MEST) (No. 2012R1A2A2A02046367 ). This research was supported by the Converging Research Center Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( 2011-50210 ).


  • Composite materials Chemical synthesis Dielectric properties Nanostructures

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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