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Electronic conduction in La-based perovskite-type oxides

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ABSTRACT

A systematic study of La-based perovskite-type oxides from the viewpoint of their electronic conduction properties was performed. LaCo0.5Ni0.5O3±δ was found to be a promising candidate as a replacement for standard metals used in oxide electrodes and wiring that are operated at temperatures up to 1173 K in air because of its high electrical conductivity and stability at high temperatures. LaCo0.5Ni0.5O3±δ exhibits a high conductivity of 1.9 × 103 S cm−1 at room temperature (R.T.) because of a high carrier concentration n of 2.2 × 1022 cm−3 and a small effective mass m∗ of 0.10 me. Notably, LaCo0.5Ni0.5O3±δ exhibits this high electrical conductivity from R.T. to 1173 K, and little change in the oxygen content occurs under these conditions. LaCo0.5Ni0.5O3±δ is the most suitable for the fabrication of oxide electrodes and wiring, though La1−xSrxCoO3±δ and La1−xSrxMnO3±δ also exhibit high electronic conductivity at R.T., with maximum electrical conductivities of 4.4 × 103 S cm−1 for La0.5Sr0.5CoO3±δ and 1.5 × 103 S cm−1 for La0.6Sr0.4MnO3±δ because oxygen release occurs in La1−xSrxCoO3±δ as elevating temperature and the electrical conductivity of La0.6Sr0.4MnO3±δ slightly decreases at temperatures above 400 K.

No MeSH data available.


Electrical conductivity, σ, and Seebeck coefficient, S, for LaCo1−xNixO3±δ at R.T. Reprinted with permission from [8]. Copyright © 2012 American Chemical Society.
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Figure 15: Electrical conductivity, σ, and Seebeck coefficient, S, for LaCo1−xNixO3±δ at R.T. Reprinted with permission from [8]. Copyright © 2012 American Chemical Society.

Mentions: The high σ value of 1.9 × 103 S cm−3 when x = 0.50 at R.T. can be attributed to the high n value of 2.2 × 1022 cm−3 and the small m∗ value of 0.10 me for x = 0.50. This result is consistent with that observed for La1−xSrxCoO3±δ. The σ and S values for LaCo1−xNixO3±δ at R.T. are shown in figure 15. The σ value reached a maximum of 1.9 × 103 S cm−3 at x = 0.50, whereas the S value reached a maximum of 230 μV/K at x = 0.05. The S value gradually decreased as the Ni content increased, approached zero at x = 0.50, and then the sign reversed from negative to positive between 0 < x < 0.05 as a result of Ni doping. The pure LaCoO3 synthesized in this study was n-type, although the sign of LaCoO3 remains a matter of discussion, as mentioned above [17, 20, 44]. The behavior of S with x reflects the increase in n and the decrease in m∗ with. The increasing x.


Electronic conduction in La-based perovskite-type oxides
Electrical conductivity, σ, and Seebeck coefficient, S, for LaCo1−xNixO3±δ at R.T. Reprinted with permission from [8]. Copyright © 2012 American Chemical Society.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC5036473&req=5

Figure 15: Electrical conductivity, σ, and Seebeck coefficient, S, for LaCo1−xNixO3±δ at R.T. Reprinted with permission from [8]. Copyright © 2012 American Chemical Society.
Mentions: The high σ value of 1.9 × 103 S cm−3 when x = 0.50 at R.T. can be attributed to the high n value of 2.2 × 1022 cm−3 and the small m∗ value of 0.10 me for x = 0.50. This result is consistent with that observed for La1−xSrxCoO3±δ. The σ and S values for LaCo1−xNixO3±δ at R.T. are shown in figure 15. The σ value reached a maximum of 1.9 × 103 S cm−3 at x = 0.50, whereas the S value reached a maximum of 230 μV/K at x = 0.05. The S value gradually decreased as the Ni content increased, approached zero at x = 0.50, and then the sign reversed from negative to positive between 0 < x < 0.05 as a result of Ni doping. The pure LaCoO3 synthesized in this study was n-type, although the sign of LaCoO3 remains a matter of discussion, as mentioned above [17, 20, 44]. The behavior of S with x reflects the increase in n and the decrease in m∗ with. The increasing x.

View Article: PubMed Central - PubMed

ABSTRACT

A systematic study of La-based perovskite-type oxides from the viewpoint of their electronic conduction properties was performed. LaCo0.5Ni0.5O3&plusmn;&delta; was found to be a promising candidate as a replacement for standard metals used in oxide electrodes and wiring that are operated at temperatures up to 1173 K in air because of its high electrical conductivity and stability at high temperatures. LaCo0.5Ni0.5O3&plusmn;&delta; exhibits a high conductivity of 1.9 &times; 103 S cm&minus;1 at room temperature (R.T.) because of a high carrier concentration n of 2.2 &times; 1022 cm&minus;3 and a small effective mass m&lowast; of 0.10 me. Notably, LaCo0.5Ni0.5O3&plusmn;&delta; exhibits this high electrical conductivity from R.T. to 1173 K, and little change in the oxygen content occurs under these conditions. LaCo0.5Ni0.5O3&plusmn;&delta; is the most suitable for the fabrication of oxide electrodes and wiring, though La1&minus;xSrxCoO3&plusmn;&delta; and La1&minus;xSrxMnO3&plusmn;&delta; also exhibit high electronic conductivity at R.T., with maximum electrical conductivities of 4.4 &times; 103 S cm&minus;1 for La0.5Sr0.5CoO3&plusmn;&delta; and 1.5 &times; 103 S cm&minus;1 for La0.6Sr0.4MnO3&plusmn;&delta; because oxygen release occurs in La1&minus;xSrxCoO3&plusmn;&delta; as elevating temperature and the electrical conductivity of La0.6Sr0.4MnO3&plusmn;&delta; slightly decreases at temperatures above 400 K.

No MeSH data available.