TY  - CONF
AU  - Perać, Sanja
AU  - Savic, Slavica
AU  - Branković, Zorica
AU  - Bernik, Slavko
AU  - Kojic, Sanja
AU  - Vasiljevic, Dragana
AU  - Branković, Goran
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2301
AB  - Ceramic samples of NaCo2-xCuxO4 (x = 0, 0.01, 0.03, 0.05) were obtained after calcination of powder precursors synthesized by a mechanochemically assisted solid-state reaction method (MASSR) and a citric acid complex method (CAC). Effects of small concentrations of Cu doping and the above-mentioned syntheses procedures on the microstructural, thermoelectric and mechanical properties were observed. The electrical resistivity (ρ), the thermal conductivity (κ) and the Seebeck coefficient (S) were measured simultaneously in the temperature gradient (ΔT) between hot and cold side of the sample, and the figure of merit (ZT) was
subsequently calculated. ZT of the CAC samples was higher compared with the MASSR samples. The highest ZT value of 0.061 at ΔT = 473 K was obtained for the sample with 5 mol% of Cu prepared by the CAC method, and it was 1.7 times higher than the highest value obtained for the MASSR sample with 3 mol% of Cu
(ZT = 0.036 at ΔT = 473 K). The CAC samples showed better mechanical properties compared to the MASSR samples due to the higher hardness of the CAC samples which is a consequence of homogeneous microstructure and higher density obtained after sintering of these samples. The results confirmed that, besides the concentration of Cu, the synthesis procedure considerably affected the microstructural, thermoelectric and mechanical properties of NaCo2O4 ceramics.
PB  - Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia
C3  - 6th Conference of the Serbian Society for Ceramic Materials
T1  - 6.	Effect of Cu dopping on microstructural, thermoelectric and mechanical properties of NaCoCuO4 ceramics
SP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2301
ER  - 

@conference{
author = "Perać, Sanja and Savic, Slavica and Branković, Zorica and Bernik, Slavko and Kojic, Sanja and Vasiljevic, Dragana and Branković, Goran",
year = "2022",
abstract = "Ceramic samples of NaCo2-xCuxO4 (x = 0, 0.01, 0.03, 0.05) were obtained after calcination of powder precursors synthesized by a mechanochemically assisted solid-state reaction method (MASSR) and a citric acid complex method (CAC). Effects of small concentrations of Cu doping and the above-mentioned syntheses procedures on the microstructural, thermoelectric and mechanical properties were observed. The electrical resistivity (ρ), the thermal conductivity (κ) and the Seebeck coefficient (S) were measured simultaneously in the temperature gradient (ΔT) between hot and cold side of the sample, and the figure of merit (ZT) was
subsequently calculated. ZT of the CAC samples was higher compared with the MASSR samples. The highest ZT value of 0.061 at ΔT = 473 K was obtained for the sample with 5 mol% of Cu prepared by the CAC method, and it was 1.7 times higher than the highest value obtained for the MASSR sample with 3 mol% of Cu
(ZT = 0.036 at ΔT = 473 K). The CAC samples showed better mechanical properties compared to the MASSR samples due to the higher hardness of the CAC samples which is a consequence of homogeneous microstructure and higher density obtained after sintering of these samples. The results confirmed that, besides the concentration of Cu, the synthesis procedure considerably affected the microstructural, thermoelectric and mechanical properties of NaCo2O4 ceramics.",
publisher = "Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia",
journal = "6th Conference of the Serbian Society for Ceramic Materials",
title = "6.	Effect of Cu dopping on microstructural, thermoelectric and mechanical properties of NaCoCuO4 ceramics",
pages = "87",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2301"
}

Perać, S., Savic, S., Branković, Z., Bernik, S., Kojic, S., Vasiljevic, D.,& Branković, G.. (2022). 6.	Effect of Cu dopping on microstructural, thermoelectric and mechanical properties of NaCoCuO4 ceramics. in 6th Conference of the Serbian Society for Ceramic Materials
Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia., 87.
https://hdl.handle.net/21.15107/rcub_rimsi_2301

Perać S, Savic S, Branković Z, Bernik S, Kojic S, Vasiljevic D, Branković G. 6.	Effect of Cu dopping on microstructural, thermoelectric and mechanical properties of NaCoCuO4 ceramics. in 6th Conference of the Serbian Society for Ceramic Materials. 2022;:87.
https://hdl.handle.net/21.15107/rcub_rimsi_2301 .

Perać, Sanja, Savic, Slavica, Branković, Zorica, Bernik, Slavko, Kojic, Sanja, Vasiljevic, Dragana, Branković, Goran, "6.	Effect of Cu dopping on microstructural, thermoelectric and mechanical properties of NaCoCuO4 ceramics" in 6th Conference of the Serbian Society for Ceramic Materials (2022):87,
https://hdl.handle.net/21.15107/rcub_rimsi_2301 .

TY  - CONF
AU  - Radojković, Aleksandar
AU  - Branković, Goran
AU  - Branković, Zorica
AU  - Žunić, Milan
AU  - Savic, Slavica
PY  - 2012
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2344
AB  - Materials with perovskite structure based on yttrium-doped barium cerate have been widely investigated as proton conducting electrolytes for intermediate-temperature solid oxide fuel cells (IT-SOFC). The main drawback of these materials is stability in CO2 that can be further enhanced by doping with Nb. 
By the method of auto-combustion (AC) it is possible to synthesize fine ceramic nano-powders compared to classic solid-state route (SS). The aim of this work is to investigate the influence of different synthesis methods on chemical stability and electrical properties of the sintered BaCe0.9Y0.1O3–δ samples doped with various concentrations of Nb.
BaCe0.9-xNbxY0.1O3-δ (where x = 0.01, 0.03 and 0.05) powders were synthesized by the AC and SS methods. Much higher specific surface areas were observed for the samples synthesized by the AC method. The dense electrolyte pellets were obtained after sintering of the powders at 1550 ºC for 5 h.The conductivities determined by impedance measurements in temperature range of 550-750 ºC in wet hydrogen medium showed a decreasing trend with increase of Nb content. The samples synthesized by the AC method had a slightly higher conductivities compared to the same compositions obtained by the SS method. The stability in CO2 at 700 ºC for 5 h, determined by X-ray analysis, was enhanced with increase in Nb concentration and there was no significant difference in stability in respect to the synthesis method. It was found that BaCe0.87Nb0.3Y0.1O3-δ is the optimal composition that satisfies the opposite demands for electrical conductivity and chemical stabilty. Its conductivity in wet hydrogen at 650 ºC is 8.7.10-3 Scm-1 which is a bit lower than for undoped BaCe0.9Y0.1O3-δ (1.0.10-2 Scm-1).
It was concluded that application of AC method enables synthesis of fine, low-agglomerated nanopowders and further processing that results in better microstructures of the sintered electrolyte samples and consequently higher electrical conductivities.
C3  - First International Conference on Processing, characterisation and application of nanostructured materials and nanotechnology NanoBelgrade 2012
T1  - The influence of synthesis method on properties of Nb doped BaCe0.9Y0.1O3-δ as a proton conducting electrolyte for IT-SOFC
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2344
ER  - 

@conference{
author = "Radojković, Aleksandar and Branković, Goran and Branković, Zorica and Žunić, Milan and Savic, Slavica",
year = "2012",
abstract = "Materials with perovskite structure based on yttrium-doped barium cerate have been widely investigated as proton conducting electrolytes for intermediate-temperature solid oxide fuel cells (IT-SOFC). The main drawback of these materials is stability in CO2 that can be further enhanced by doping with Nb. 
By the method of auto-combustion (AC) it is possible to synthesize fine ceramic nano-powders compared to classic solid-state route (SS). The aim of this work is to investigate the influence of different synthesis methods on chemical stability and electrical properties of the sintered BaCe0.9Y0.1O3–δ samples doped with various concentrations of Nb.
BaCe0.9-xNbxY0.1O3-δ (where x = 0.01, 0.03 and 0.05) powders were synthesized by the AC and SS methods. Much higher specific surface areas were observed for the samples synthesized by the AC method. The dense electrolyte pellets were obtained after sintering of the powders at 1550 ºC for 5 h.The conductivities determined by impedance measurements in temperature range of 550-750 ºC in wet hydrogen medium showed a decreasing trend with increase of Nb content. The samples synthesized by the AC method had a slightly higher conductivities compared to the same compositions obtained by the SS method. The stability in CO2 at 700 ºC for 5 h, determined by X-ray analysis, was enhanced with increase in Nb concentration and there was no significant difference in stability in respect to the synthesis method. It was found that BaCe0.87Nb0.3Y0.1O3-δ is the optimal composition that satisfies the opposite demands for electrical conductivity and chemical stabilty. Its conductivity in wet hydrogen at 650 ºC is 8.7.10-3 Scm-1 which is a bit lower than for undoped BaCe0.9Y0.1O3-δ (1.0.10-2 Scm-1).
It was concluded that application of AC method enables synthesis of fine, low-agglomerated nanopowders and further processing that results in better microstructures of the sintered electrolyte samples and consequently higher electrical conductivities.",
journal = "First International Conference on Processing, characterisation and application of nanostructured materials and nanotechnology NanoBelgrade 2012",
title = "The influence of synthesis method on properties of Nb doped BaCe0.9Y0.1O3-δ as a proton conducting electrolyte for IT-SOFC",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2344"
}

Radojković, A., Branković, G., Branković, Z., Žunić, M.,& Savic, S.. (2012). The influence of synthesis method on properties of Nb doped BaCe0.9Y0.1O3-δ as a proton conducting electrolyte for IT-SOFC. in First International Conference on Processing, characterisation and application of nanostructured materials and nanotechnology NanoBelgrade 2012.
https://hdl.handle.net/21.15107/rcub_rimsi_2344

Radojković A, Branković G, Branković Z, Žunić M, Savic S. The influence of synthesis method on properties of Nb doped BaCe0.9Y0.1O3-δ as a proton conducting electrolyte for IT-SOFC. in First International Conference on Processing, characterisation and application of nanostructured materials and nanotechnology NanoBelgrade 2012. 2012;.
https://hdl.handle.net/21.15107/rcub_rimsi_2344 .

Radojković, Aleksandar, Branković, Goran, Branković, Zorica, Žunić, Milan, Savic, Slavica, "The influence of synthesis method on properties of Nb doped BaCe0.9Y0.1O3-δ as a proton conducting electrolyte for IT-SOFC" in First International Conference on Processing, characterisation and application of nanostructured materials and nanotechnology NanoBelgrade 2012 (2012),
https://hdl.handle.net/21.15107/rcub_rimsi_2344 .