Influence of nanometric microstructural development on thermophysical properties of lanthanum-doped strontium titanate
The evolution of imperfect crystal from a highly amorphous structure to an ordered crystalline structure via sintering has demonstrated a significant development onto the thermophysical properties. Therefore, a series of La-doped strontium titanate with different morphological properties have been s...
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Main Authors: | , , , , , , , , , , |
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Format: | Article |
Language: | English English |
Published: |
Elsevier
2021
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Subjects: | |
Online Access: | http://umpir.ump.edu.my/id/eprint/32459/1/Influence%20of%20nanometric%20microstructural%20development%20on%20thermophysical%20properties%20%20.pdf http://umpir.ump.edu.my/id/eprint/32459/2/Influence%20of%20nanometric%20microstructural%20development%20on%20thermophysical%20properties_FULL.pdf http://umpir.ump.edu.my/id/eprint/32459/ https://doi.org/10.1016/j.matchemphys.2021.124867 https://doi.org/10.1016/j.matchemphys.2021.124867 |
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Institution: | Universiti Malaysia Pahang |
Language: | English English |
Summary: | The evolution of imperfect crystal from a highly amorphous structure to an ordered crystalline structure via sintering has demonstrated a significant development onto the thermophysical properties. Therefore, a series of La-doped strontium titanate with different morphological properties have been synthesized via high energy ball milling with subsequent sintering. Doping of lanthanum tends to inhibit the grain growth where a significant reduction of grain size (range from 34 nm to 0.47 μm) could be observed. A large amount of grain boundaries presence with fine grains, resulting from lanthanum doping, has enhanced phonon scattering, thus yielding a low heat propagation in La-doped SrTiO3. Besides acting as a grain growth inhibitor, lanthanum also acts as a scattering centre due to imperfection created by the doping. The scattering mechanisms significantly decrease the phonon mean free path. Consequently, the thermal diffusivity has been efficiently reduced to 1.1 mm2/s as compared to that of pure SrTiO3 which showed a value of about 3.8 mm2/s, both observed for the complete phase polycrystalline materials. The systematic development of thermophysical and morphological properties of La-doped SrTiO3 can be served as a preliminary guide to engineer thermoelectric materials with low thermal diffusivity. |
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