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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.

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Temperature dependence of (a) electrical conductivity, σ, and (b) Seebeck coefficient, S, for LaCo1−xNixO3±δ. Reprinted with permission from [8]. Copyright © 2012 American Chemical Society.
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Figure 16: Temperature dependence of (a) electrical conductivity, σ, and (b) Seebeck coefficient, S, for LaCo1−xNixO3±δ. Reprinted with permission from [8]. Copyright © 2012 American Chemical Society.

Mentions: Figure 16(a) shows the σ values for LaCo1−xNixO3±δ samples measured at 373–1173 K in air. The σ value for x ≤ 0.40 exhibited semiconducting behavior below 800 K but became saturated above 800 K. In contrast, the conductivity for x = 0.50 exhibited the largest value and was metallic over the entire temperature range examined, i.e. the σ value monotonically decreased with the increasing temperature. In addition, the temperature coefficient of conductivity for x = 0.50 was smaller than that of standard metals, indicating that LaCo1−xNixO3±δ for x = 0.50 is suitable for use as an oxide electrode and as wiring at high temperatures in air.


Electronic conduction in La-based perovskite-type oxides
Temperature dependence of (a) electrical conductivity, σ, and (b) Seebeck coefficient, S, for LaCo1−xNixO3±δ. 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 16: Temperature dependence of (a) electrical conductivity, σ, and (b) Seebeck coefficient, S, for LaCo1−xNixO3±δ. Reprinted with permission from [8]. Copyright © 2012 American Chemical Society.
Mentions: Figure 16(a) shows the σ values for LaCo1−xNixO3±δ samples measured at 373–1173 K in air. The σ value for x ≤ 0.40 exhibited semiconducting behavior below 800 K but became saturated above 800 K. In contrast, the conductivity for x = 0.50 exhibited the largest value and was metallic over the entire temperature range examined, i.e. the σ value monotonically decreased with the increasing temperature. In addition, the temperature coefficient of conductivity for x = 0.50 was smaller than that of standard metals, indicating that LaCo1−xNixO3±δ for x = 0.50 is suitable for use as an oxide electrode and as wiring at high temperatures in air.

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±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.


Related in: MedlinePlus