Fluoride ion conducting behavior in nonstoichiometric lanthanum oxyfluoride

Fluoride ion conducting behavior in nonstoichiometric lanthanum oxyfluoride
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非化学计量氟氧化镧中氟离子的传导行为

DOI:
10.1016/j.ceramint.2022.10.079
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发表时间:
2023
影响因子:
5.2
通讯作者:
Imanaka Nobuhito
Imanaka Nobuhito
中科院分区:
材料科学1区
文献类型:
--
作者:
Momai Mizuki;Tamura Shinji;Imanaka Nobuhito

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非化学计量的氟氧化镧LaO 1 − xF 1 +2x(0 ≤x≤ 0.5)和Sr 2+掺杂的La 1 −ySryO0.6−x−0.5yF1.8+2x(0 ≤x≤ 0.2,0 ≤y≤ 0.4)被研究作为氟离子(F−)导体的潜在候选物。虽然化学计量的LaOF已经被报道表现出在四方α-相(空间群:P4/nmm)和三方β-相(R-3 m)之间的相变,但是通过将过量的F−离子引入到氟氧化镧的晶格中,这种相变被成功地抑制了。此外,过量F−离子的引入也改善了氟氧化物晶格的导电性能。在所研究的各种样品中,观察到La0.7Sr0.3O0.4F1.9(x= 0.05,y = 0.3)的F−离子电导率最高,在300 °C时的值为2.9 × 10−4S cm− 1,约为化学计量LaOF的930倍。
Nonstoichiometric lanthanum oxyfluorides, LaO1−xF1+2x(0 ≤x≤ 0.5) and Sr2+-doped La1−ySryO0.6−x−0.5yF1.8+2x(0 ≤x≤ 0.2, 0 ≤y≤ 0.4), were investigated as potential candidates for fluoride ion (F−) conductors. Although stoichiometric LaOF has been reported to exhibit a phase transition between the tetragonal α-phase (space group:P4/nmm) and trigonal β-phase (R-3m), such a phase transition was successfully suppressed by introducing excess F−ions into the lattice of lanthanum oxyfluoride. Furthermore, the introduction of excess F−ions, also improved the-conducting properties of the oxyflouride lattice. Among the various samples investigated, it was observed that, the F−ion conductivity of La0.7Sr0.3O0.4F1.9(x= 0.05,y= 0.3) was the highest, with a value of 2.9 × 10−4S cm−1at 300 °C, approximately 930 times higher than that of stoichiometric LaOF.
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