Details
| Original language | English |
|---|---|
| Pages (from-to) | 2518-2524 |
| Number of pages | 7 |
| Journal | Chemistry of Materials |
| Volume | 21 |
| Issue number | 12 |
| Early online date | 4 May 2009 |
| Publication status | Published - 23 Jun 2009 |
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.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Chemical Engineering(all)
- General Chemical Engineering
- Materials Science(all)
- Materials Chemistry
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In: Chemistry of Materials, Vol. 21, No. 12, 23.06.2009, p. 2518-2524.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - A one-step mechanochemical route to core-Shell Ca2SnO 4 Nanoparticles Followed by 119 Sn MAS NMR and 119 Sn Mössbauer Spectroscopy
AU - Šepelák, Vladimir
AU - Becker, Klaus Dieter
AU - Bergmann, Ingo
AU - Suzuki, Shigeru
AU - Indris, Sylvio
AU - Feldhoff, Armin
AU - Heitjans, Paul
AU - Grey, Clare P.
PY - 2009/6/23
Y1 - 2009/6/23
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=67649268151&partnerID=8YFLogxK
U2 - 10.1021/cm900590d
DO - 10.1021/cm900590d
M3 - Article
AN - SCOPUS:67649268151
VL - 21
SP - 2518
EP - 2524
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 12
ER -