The determining factor for interstitial oxygen formation in Ruddlesden-Popper type La2NiO4-based oxides
The determining factor for interstitial oxygen formation in Ruddlesden-Popper type La2NiO4-based oxides
复制标题
DOI：
10.1039/c5cp05993c
复制
发表时间：
2016-01-21
影响因子：
3.3
通讯作者：
Amezawa, Koji
中科院分区：
文献类型：
--
作者：
Nakamura, Takashi;Oike, Ryo;Amezawa, Koji
用软X射线吸收光谱研究了La2NiO4基氧化物中间隙氧的形成机理。随着间隙氧浓度的增加，O-K边光谱的前缘峰增加，而Ni-L边光谱几乎不变。这些光谱变化强烈地表明，配体氧通过提供/接受电子电荷载流子对间隙氧的形成做出了重要贡献。O-K边积分峰强度的变化强烈地表明，间隙氧的形成是由配体氧的平衡未占据的PDO决定的。从这一假说出发，我们认为调控La2NiO4基氧化物的电子结构是控制间隙氧形成能力的关键。
The interstitial oxygen formation mechanism in La2NiO4-based oxides was studied using soft X-ray absorption spectroscopy. When the interstitial oxygen concentration increased, the pre-edge peak of O K-edge spectra increased while Ni L-edge spectra was almost invariant. These spectral changes strongly suggest the significant contribution of ligand oxygen to interstitial oxygen formation by providing/accepting electronic charge carriers. The variation of the integrated peak intensity of the O K-edge strongly suggests that interstitial oxygen formation is determined by the equilibrium unoccupied pDOS of ligand oxygen. From this hypothesis, we propose that modulating the electronic structure is the key to control the capability of interstitial oxygen formation in La2NiO4-based oxides.