Abstract
The very low-temperature synthesis (20-80°C) of sub-15 nm Ba xSr1-xTiO3 (0 ≤ x ≤ 1) nanocrystals and characterization of their dielectric properties as a function of composition are reported. A series of BaxSr1-xTiO3 nanocrystals were synthesized under ultrabenign conditions (i.e., low temperatures, ambient pressure and neutral pH) using a vapor diffusion sol-gel technique, whereby water is slowly diffused into a mixture of bimetallic alkoxides to yield the solid-solution nanocrystals in quantitative yield on the gram scale. The unsintered 12 nm Ba0.69Sr0.31TiO 3 nanocrystals synthesized at 20°C possess a maximized dielectric constant (ε′ = 341 at 1 kHz) for the solid solution series, and is more than an order of magnitude greater than the dielectric constant for SrTiO3 (ε′ = 11.0 at 1 kHz). The observed non-monotonic dependence of the dielectric constant on solid solution composition for these small nanocrystals is consistent with theoretical and empirical studies for bulk BaxSr1-xTiO3 ceramics, proving this dielectric effect holds for small nanocrystals.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 5074-5079 |
| Number of pages | 6 |
| Journal | Journal of Materials Chemistry |
| Volume | 20 |
| Issue number | 24 |
| DOIs | |
| State | Published - Jun 21 2010 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Chemistry(all)
- Materials Chemistry
Cite this
Low-temperature synthesis of solid-solution BaxSr 1-xTiO3 nanocrystals. / Beier, Christopher W.; Heffern, Marie; Brutchey, Richard L.
In: Journal of Materials Chemistry, Vol. 20, No. 24, 21.06.2010, p. 5074-5079.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Low-temperature synthesis of solid-solution BaxSr 1-xTiO3 nanocrystals
AU - Beier, Christopher W.
AU - Heffern, Marie
AU - Brutchey, Richard L.
PY - 2010/6/21
Y1 - 2010/6/21
N2 - The very low-temperature synthesis (20-80°C) of sub-15 nm Ba xSr1-xTiO3 (0 ≤ x ≤ 1) nanocrystals and characterization of their dielectric properties as a function of composition are reported. A series of BaxSr1-xTiO3 nanocrystals were synthesized under ultrabenign conditions (i.e., low temperatures, ambient pressure and neutral pH) using a vapor diffusion sol-gel technique, whereby water is slowly diffused into a mixture of bimetallic alkoxides to yield the solid-solution nanocrystals in quantitative yield on the gram scale. The unsintered 12 nm Ba0.69Sr0.31TiO 3 nanocrystals synthesized at 20°C possess a maximized dielectric constant (ε′ = 341 at 1 kHz) for the solid solution series, and is more than an order of magnitude greater than the dielectric constant for SrTiO3 (ε′ = 11.0 at 1 kHz). The observed non-monotonic dependence of the dielectric constant on solid solution composition for these small nanocrystals is consistent with theoretical and empirical studies for bulk BaxSr1-xTiO3 ceramics, proving this dielectric effect holds for small nanocrystals.
AB - The very low-temperature synthesis (20-80°C) of sub-15 nm Ba xSr1-xTiO3 (0 ≤ x ≤ 1) nanocrystals and characterization of their dielectric properties as a function of composition are reported. A series of BaxSr1-xTiO3 nanocrystals were synthesized under ultrabenign conditions (i.e., low temperatures, ambient pressure and neutral pH) using a vapor diffusion sol-gel technique, whereby water is slowly diffused into a mixture of bimetallic alkoxides to yield the solid-solution nanocrystals in quantitative yield on the gram scale. The unsintered 12 nm Ba0.69Sr0.31TiO 3 nanocrystals synthesized at 20°C possess a maximized dielectric constant (ε′ = 341 at 1 kHz) for the solid solution series, and is more than an order of magnitude greater than the dielectric constant for SrTiO3 (ε′ = 11.0 at 1 kHz). The observed non-monotonic dependence of the dielectric constant on solid solution composition for these small nanocrystals is consistent with theoretical and empirical studies for bulk BaxSr1-xTiO3 ceramics, proving this dielectric effect holds for small nanocrystals.
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UR - http://www.scopus.com/inward/citedby.url?scp=77953568319&partnerID=8YFLogxK
U2 - 10.1039/c0jm00845a
DO - 10.1039/c0jm00845a
M3 - Article
AN - SCOPUS:77953568319
VL - 20
SP - 5074
EP - 5079
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
SN - 0959-9428
IS - 24
ER -