A one-step mechanochemical route to core-Shell Ca 2 SnO 4 Nanoparticles Followed by 119 Sn MAS NMR and 119 Sn Mössbauer Spectroscopy

Vladimir Šepelák, Klaus Dieter Becker, Ingo Bergmann, Shigeru Suzuki, Sylvio Indris, Armin Feldhoff, Paul Heitjans, Clare P. Grey

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Calcium stannate (Ca 2SnO 4) nanoparticles with an average size of about 15 nm were synthesized via single-step mechanochemical processing of binary oxide precursors at room temperature. High-resolution TEM studies revealed a nonuniform structure of mechanosynthesized Ca 2SnO 4 nanoparticles consisting of an ordered core surrounded by a disordered surface shell region. The inner core of a Ca 2SnO 4nanoparticle possesses a fully ordered orthorhombic structure, and the surface shell exhibits the thickness of about 1.5 nm. The volume fraction of surface shell regions in the nanostructured mechanosynthesized stannate is estimated to be about 50%. Because of the ability of both solid-state 119Sn MAS NMR and 119Sn Mössbauer spectroscopies to probe the local environment of Sn nuclei, valuable complementary insight into the local structural disorder in mechanosynthesized Ca 2SnO 4 was obtained. It was concluded that the near-surface layers of stannate nanoparticles are disordered because of broadly distorted geometry of SnO 6 octahedra. The octahedra are deformed in such a way that they become more regular.

Original languageEnglish
Pages (from-to)2518-2524
Number of pages7
JournalChemistry of Materials
Volume21
Issue number12
DOIs
Publication statusPublished - 2009 Jun 23

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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