Details

Autor(en) / Beteiligte

• epelk, Vladimir
• Becker, Sebastian M
• Bergmann, Ingo
• Indris, Sylvio
• Scheuermann, Marco
• Feldhoff, Armin
• Kbel, Christian
• Bruns, Michael
• Strzl, Ninette
• Ulrich, Anne S
• Ghafari, Mohammad
• Hahn, Horst
• Grey, Clare P
• Becker, Klaus D
• Heitjans, Paul

Titel

Nonequilibrium structure of Zn2SnO4 spinel nanoparticles

Ist Teil von

• Journal of materials chemistry, 2012-01, Vol.22 (7), p.3117-3126

Erscheinungsjahr

2012

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Zinc stannate (Zn 2 SnO 4 ) nanoparticles with an average size of about 26 nm are synthesized via single-step mechanochemical processing of binary oxide precursors (ZnO and SnO 2 ) at ambient temperature, without the need for the subsequent calcination, thus making the synthesis route very simple and cost-effective. The mechanically induced phase evolution of the 2ZnO + SnO 2 mixture is followed by XRD and by a variety of spectroscopic techniques including 119 Sn MAS NMR, Raman spectroscopy, 119 Sn Mssbauer spectroscopy, and XPS. High-resolution TEM studies reveal a non-uniform structure of mechanosynthesized Zn 2 SnO 4 nanoparticles consisting of a crystalline core surrounded by a structurally disordered surface shell. Due to the ability of the applied solid-state spectroscopies to probe the local environment of Sn cations, valuable complementary insight into the nature of the local structural disorder of mechanosynthesized Zn 2 SnO 4 is obtained. The findings hint at a highly nonequilibrium state of the as-prepared stannate characterized by its partly inverse spinel structure and the presence of deformed polyhedra in the surface shell of nanoparticles. In contrast to the bulk Zn 2 SnO 4 with a fully inverse spinel structure, the mechanosynthesized Zn 2 SnO 4 nanoparticles exhibit a highly nonequilibrium state characterized by a partly inverse spinel structure and deformed polyhedra in the surface shell of nanoparticles.