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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.


Stability of La1−xSrxMnO3±δ (x = 0.40, 0.67, 0.80). (a) Conductivity and (b) Seebeck coefficient. The solid line and symbols are before annealing in air at 1273 K for 100 h; the dotted line and open symbols are after annealing at 1273 K for 100 h. Reproduced from [9] by permission of The Royal Society of Chemistry.
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Figure 11: Stability of La1−xSrxMnO3±δ (x = 0.40, 0.67, 0.80). (a) Conductivity and (b) Seebeck coefficient. The solid line and symbols are before annealing in air at 1273 K for 100 h; the dotted line and open symbols are after annealing at 1273 K for 100 h. Reproduced from [9] by permission of The Royal Society of Chemistry.

Mentions: Figure 11 shows the durability of La1−xSrxMnO3±δ (x = 0.40, 0.67 and 0.80) evaluated by comparing the temperature dependence of both σ and S before and after annealing at 1273 K for 100 h in air. For each composition, annealing had a negligible effect on both σ and S. Moreover, the σ value for x = 0.67 barely changed with annealing at 1273 K for 500 h, as reported previously [9]. These data indicate that La1−xSrxMnO3±δ has a high phase stability at high temperatures in air, although it is an n-type oxide.


Electronic conduction in La-based perovskite-type oxides
Stability of La1−xSrxMnO3±δ (x = 0.40, 0.67, 0.80). (a) Conductivity and (b) Seebeck coefficient. The solid line and symbols are before annealing in air at 1273 K for 100 h; the dotted line and open symbols are after annealing at 1273 K for 100 h. Reproduced from [9] by permission of The Royal Society of Chemistry.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 11: Stability of La1−xSrxMnO3±δ (x = 0.40, 0.67, 0.80). (a) Conductivity and (b) Seebeck coefficient. The solid line and symbols are before annealing in air at 1273 K for 100 h; the dotted line and open symbols are after annealing at 1273 K for 100 h. Reproduced from [9] by permission of The Royal Society of Chemistry.
Mentions: Figure 11 shows the durability of La1−xSrxMnO3±δ (x = 0.40, 0.67 and 0.80) evaluated by comparing the temperature dependence of both σ and S before and after annealing at 1273 K for 100 h in air. For each composition, annealing had a negligible effect on both σ and S. Moreover, the σ value for x = 0.67 barely changed with annealing at 1273 K for 500 h, as reported previously [9]. These data indicate that La1−xSrxMnO3±δ has a high phase stability at high temperatures in air, although it is an n-type oxide.

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.