Origin of the Large Oxygen Permeability in Praseodymium Nickel Oxides

本文从原子和电子两个层次上研究了掺杂镨氧化物镍（Pr_<0. 9>La_<0. 1>）_2（Ni_<0. 74>Cu_<0. 21>Ga_<0. 05>）O_（4+δ）中大透氧率的成因。高温中子衍射结果表明，（Pr_<0. 9>La_<0. 1>）_2（Ni_<0. 74>Cu_<0. 21>Ga_<0. 05>）O_（4+δ）中的氧离子是通过间隙位二维扩散的，这是氧离子高扩散率的原因。

Origin of the large oxygen permeability in the doped praseodymium nickel oxide(Pr_<0. 9> La_<0. 1>)_2(Ni_<0. 74> Cu_<0. 21> Ga_<0. 05>) O_<4+δ> has been investigated at atomic and electronic levels. Using the high-temperature neutron diffractometry, we found that the oxide ions in(Pr_<0. 9> La_<0. 1>)_2(Ni_<0. 74> Cu_<0. 21> Ga_<0. 05>) O_<4+δ> diffuse two dimensionally through the interstitial site, which is responsible for the high oxide-ion diffusivity.