Thermoelectric properties of Cu-doped sodium cobaltite ceramics
Аутори
Perać, SanjaSavic, Slavica
Branković, Zorica
Vrtnik, Stanislav
Bernik, Slavko
Branković, Goran
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Layered cobalt oxide materials have lately been the subject of considerable
fundamental and practical interest as potential candidates for thermoelectric
application. The polycrystalline samples of NaCo2–xCuxO4 (x = 0, 0.01, 0.03, 0.05)
were obtained by mechanochemically assisted solid-state reaction method (MASSR)
and the citric acid complex method (CAC). Ceramic samples were prepared by
pressing into disc-shaped pellets and subsequently sintered at 880 °C for 20 h in
inert argon atmosphere. The electrical resistivity (ρ), the thermal conductivity (κ)
and the Seebeck coefficient (S) were measured and observed in two temperature
regions: low (from 0 to 300 K) and high (from 300 K to 800 K), and the effect of
small concentrations of the dopant on the thermoelectric properties was observed.
The values of κ were lower in higher temperature region, and almost independent of
Cu concentration. S was positive above 25 K, and higher for Cu-doped samples,
reaching the highest values... for both syntheses for samples with x = 0.03(145 μV/K
at 873 K for CAC sample). The highest figure of merit (ZT) at room temperature
(0.022) was obtained for x = 0.01 while at high temperature region ZT were 0.050
and 0.034 for CAC and MASSR samples, respectively. ZT values for all samples
were higher than in undoped samples, confirming that even small concentration of
Cu significantly influences the thermoelectric properties of NaCo2O4. It was found
that the samples synthesized by CAC method possess better thermoelectric
properties, confirming the fact that this type of synthesis enables obtaining fine,
homogeneous precursor powders with fine microstructures and small grains which
presents prerequisite for obtaining material with good thermoelectric performances.
Кључне речи:
Thermoelectric properties / Electrical resistivity / Sodium cobaltite / Thermal conductivity / Figure of meritИзвор:
3rd Conference of the Serbian Society for Ceramic Materials, 2015, 57-Издавач:
- Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia
Финансирање / пројекти:
- 0-3D наноструктуре за примену у електроници и обновљивим изворима енергије: синтеза, карактеризација и процесирање (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45007)
Институција/група
Institut za multidisciplinarna istraživanjaTY - CONF AU - Perać, Sanja AU - Savic, Slavica AU - Branković, Zorica AU - Vrtnik, Stanislav AU - Bernik, Slavko AU - Branković, Goran PY - 2015 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/2367 AB - Layered cobalt oxide materials have lately been the subject of considerable fundamental and practical interest as potential candidates for thermoelectric application. The polycrystalline samples of NaCo2–xCuxO4 (x = 0, 0.01, 0.03, 0.05) were obtained by mechanochemically assisted solid-state reaction method (MASSR) and the citric acid complex method (CAC). Ceramic samples were prepared by pressing into disc-shaped pellets and subsequently sintered at 880 °C for 20 h in inert argon atmosphere. The electrical resistivity (ρ), the thermal conductivity (κ) and the Seebeck coefficient (S) were measured and observed in two temperature regions: low (from 0 to 300 K) and high (from 300 K to 800 K), and the effect of small concentrations of the dopant on the thermoelectric properties was observed. The values of κ were lower in higher temperature region, and almost independent of Cu concentration. S was positive above 25 K, and higher for Cu-doped samples, reaching the highest values for both syntheses for samples with x = 0.03(145 μV/K at 873 K for CAC sample). The highest figure of merit (ZT) at room temperature (0.022) was obtained for x = 0.01 while at high temperature region ZT were 0.050 and 0.034 for CAC and MASSR samples, respectively. ZT values for all samples were higher than in undoped samples, confirming that even small concentration of Cu significantly influences the thermoelectric properties of NaCo2O4. It was found that the samples synthesized by CAC method possess better thermoelectric properties, confirming the fact that this type of synthesis enables obtaining fine, homogeneous precursor powders with fine microstructures and small grains which presents prerequisite for obtaining material with good thermoelectric performances. PB - Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia C3 - 3rd Conference of the Serbian Society for Ceramic Materials T1 - Thermoelectric properties of Cu-doped sodium cobaltite ceramics SP - 57 UR - https://hdl.handle.net/21.15107/rcub_rimsi_2367 ER -
@conference{ author = "Perać, Sanja and Savic, Slavica and Branković, Zorica and Vrtnik, Stanislav and Bernik, Slavko and Branković, Goran", year = "2015", abstract = "Layered cobalt oxide materials have lately been the subject of considerable fundamental and practical interest as potential candidates for thermoelectric application. The polycrystalline samples of NaCo2–xCuxO4 (x = 0, 0.01, 0.03, 0.05) were obtained by mechanochemically assisted solid-state reaction method (MASSR) and the citric acid complex method (CAC). Ceramic samples were prepared by pressing into disc-shaped pellets and subsequently sintered at 880 °C for 20 h in inert argon atmosphere. The electrical resistivity (ρ), the thermal conductivity (κ) and the Seebeck coefficient (S) were measured and observed in two temperature regions: low (from 0 to 300 K) and high (from 300 K to 800 K), and the effect of small concentrations of the dopant on the thermoelectric properties was observed. The values of κ were lower in higher temperature region, and almost independent of Cu concentration. S was positive above 25 K, and higher for Cu-doped samples, reaching the highest values for both syntheses for samples with x = 0.03(145 μV/K at 873 K for CAC sample). The highest figure of merit (ZT) at room temperature (0.022) was obtained for x = 0.01 while at high temperature region ZT were 0.050 and 0.034 for CAC and MASSR samples, respectively. ZT values for all samples were higher than in undoped samples, confirming that even small concentration of Cu significantly influences the thermoelectric properties of NaCo2O4. It was found that the samples synthesized by CAC method possess better thermoelectric properties, confirming the fact that this type of synthesis enables obtaining fine, homogeneous precursor powders with fine microstructures and small grains which presents prerequisite for obtaining material with good thermoelectric performances.", publisher = "Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia", journal = "3rd Conference of the Serbian Society for Ceramic Materials", title = "Thermoelectric properties of Cu-doped sodium cobaltite ceramics", pages = "57", url = "https://hdl.handle.net/21.15107/rcub_rimsi_2367" }
Perać, S., Savic, S., Branković, Z., Vrtnik, S., Bernik, S.,& Branković, G.. (2015). Thermoelectric properties of Cu-doped sodium cobaltite ceramics. in 3rd Conference of the Serbian Society for Ceramic Materials Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia., 57. https://hdl.handle.net/21.15107/rcub_rimsi_2367
Perać S, Savic S, Branković Z, Vrtnik S, Bernik S, Branković G. Thermoelectric properties of Cu-doped sodium cobaltite ceramics. in 3rd Conference of the Serbian Society for Ceramic Materials. 2015;:57. https://hdl.handle.net/21.15107/rcub_rimsi_2367 .
Perać, Sanja, Savic, Slavica, Branković, Zorica, Vrtnik, Stanislav, Bernik, Slavko, Branković, Goran, "Thermoelectric properties of Cu-doped sodium cobaltite ceramics" in 3rd Conference of the Serbian Society for Ceramic Materials (2015):57, https://hdl.handle.net/21.15107/rcub_rimsi_2367 .