Abstract
We herein report the effects of metal nanoinclusions (Cu, Al, and Sn) embedded at grain boundaries on the thermoelectric transport and mechanical properties of Mg2Si-based compounds. Hybrid powders of microscale Al and Bi co-doped Mg2Si (Mg1.96Al0.04Si0.97Bi0.03) and nanoscale metal particles were synthesized by a nanometal decoration technique and their nanocomposites were fabricated by a spark plasma sintering process. In compacted polycrystalline bulks, homogeneous dispersion of metal nanoparticles (~150 nm) was readily achieved at grain boundaries. The thermoelectric performance of the nanocomposites deteriorated mainly because of the reduced mobility owing to intensified electron scattering at the phase boundaries between the Mg2Si matrix and metal nanoinclusions, while the fracture toughness (~1.10 MPa m1/2, 35% improvement) was significantly enhanced on introducing Al nanoparticles.
| Original language | English |
|---|---|
| Pages (from-to) | 12979-12982 |
| Number of pages | 4 |
| Journal | Ceramics International |
| Volume | 43 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - 2017 Oct 15 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry
Cite this
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Enhanced fracture toughness of Al and Bi co-doped Mg2Si by metal nanoparticle decoration. / Kim, Gwansik; Lee, Hwijong; Kim, Jeongmin; Roh, Jong Wook; Lyo, Inwoong; Kim, Byung Wook; Lee, Kyu Hyoung; Lee, Wooyoung.
In: Ceramics International, Vol. 43, No. 15, 15.10.2017, p. 12979-12982.Research output: Contribution to journal › Article
TY - JOUR
T1 - Enhanced fracture toughness of Al and Bi co-doped Mg2Si by metal nanoparticle decoration
AU - Kim, Gwansik
AU - Lee, Hwijong
AU - Kim, Jeongmin
AU - Roh, Jong Wook
AU - Lyo, Inwoong
AU - Kim, Byung Wook
AU - Lee, Kyu Hyoung
AU - Lee, Wooyoung
PY - 2017/10/15
Y1 - 2017/10/15
N2 - We herein report the effects of metal nanoinclusions (Cu, Al, and Sn) embedded at grain boundaries on the thermoelectric transport and mechanical properties of Mg2Si-based compounds. Hybrid powders of microscale Al and Bi co-doped Mg2Si (Mg1.96Al0.04Si0.97Bi0.03) and nanoscale metal particles were synthesized by a nanometal decoration technique and their nanocomposites were fabricated by a spark plasma sintering process. In compacted polycrystalline bulks, homogeneous dispersion of metal nanoparticles (~150 nm) was readily achieved at grain boundaries. The thermoelectric performance of the nanocomposites deteriorated mainly because of the reduced mobility owing to intensified electron scattering at the phase boundaries between the Mg2Si matrix and metal nanoinclusions, while the fracture toughness (~1.10 MPa m1/2, 35% improvement) was significantly enhanced on introducing Al nanoparticles.
AB - We herein report the effects of metal nanoinclusions (Cu, Al, and Sn) embedded at grain boundaries on the thermoelectric transport and mechanical properties of Mg2Si-based compounds. Hybrid powders of microscale Al and Bi co-doped Mg2Si (Mg1.96Al0.04Si0.97Bi0.03) and nanoscale metal particles were synthesized by a nanometal decoration technique and their nanocomposites were fabricated by a spark plasma sintering process. In compacted polycrystalline bulks, homogeneous dispersion of metal nanoparticles (~150 nm) was readily achieved at grain boundaries. The thermoelectric performance of the nanocomposites deteriorated mainly because of the reduced mobility owing to intensified electron scattering at the phase boundaries between the Mg2Si matrix and metal nanoinclusions, while the fracture toughness (~1.10 MPa m1/2, 35% improvement) was significantly enhanced on introducing Al nanoparticles.
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U2 - 10.1016/j.ceramint.2017.06.002
DO - 10.1016/j.ceramint.2017.06.002
M3 - Article
AN - SCOPUS:85020118579
VL - 43
SP - 12979
EP - 12982
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 15
ER -