Preparation of functional metal nanoparticles embedded mullite composite powders by solid solution reduction

Wang Hao, Gao Le, Wang Weimin, Fu Zhengyi, Sekino Tohru, Wohn Lee Soo, Niihara Koichi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The mullite composite powders with embedded Fe and Ge nanoparticles were individually prepared through the reduction of Al5.4Fe 0.6Si2O13 and Al12Si 3.75Ge0.25O26 solid solution. The complete reduction of Fe3+ cation in solid solution is realized by hydrogen at 1200°C for 1 h. The magnetic properties of composite powders such as hysteresis loops and magnetization versus temperature were measured using SQUID. The Fe nanoparticles with the particle size around 10 nm embedded in mullite grain show the superparamagnetic behavior with the blocking temperature around 50 K. The mullite composite powders with Ge nanoparticles have strong room temperature photoluminescence (PL) at 561, 610, 676, 713 and 787 nm, respectively. The highest photoluminescence intensity was observed in the sample reduced at 500°C for 3 h. Based on the analysis of XPS and Raman spectra, it is clear that the PL phenomenon is derived from the formation of embedded Ge clusters with the average size of around 1-2 nm in mullite composite powders. It is proved that the multi-functional mullite nanocomposites with functional metal nanoparticles can be prepared through the selective reduction of designed solid solutions.

Original languageEnglish
Pages (from-to)452-456
Number of pages5
JournalJournal of the Ceramic Society of Japan
Issue number1364
Publication statusPublished - 2009 Apr
Externally publishedYes


  • Ge nanoparticles
  • Iron nanoparticles
  • Magnetic properties
  • Mullite
  • Photoluminescence
  • Solid solution

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry


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