REDUCED FORMS OF LANIO3 PEROVSKITE .1. EVIDENCE FOR NEW PHASES - LA2NI2O5 AND LANIO2
REDUCED FORMS OF LANIO3 PEROVSKITE .1. EVIDENCE FOR NEW PHASES - LA2NI2O5 AND LANIO2
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DOI：
10.1039/f29837901181
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发表时间：
1983-01-01
期刊：
影响因子：
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通讯作者：
GATINEAU, L
中科院分区：
文献类型：
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作者：
CRESPIN, M;LEVITZ, P;GATINEAU, L
LaNiO_3在氢气氛下低温还原，在完全还原前生成La_2Ni_2O_5和LaNiO_2等新化合物。氢消耗，X射线衍射和XANES证明这些新相的存在。LaNiO3中的Ni3+变为La2Ni2O5中的Ni2+，在LaNiO2中得到纯的一价镍相。在此阶段之后，镍作为镍金属离开结构。在完全还原之前，La2Ni2O5和LaNiO 2的可逆再氧化导致LaNiO 3钙钛矿的原始结构。
Low-temperature reduction of LaNiO3 under hydrogen leads to new compounds such as La2Ni2O5 and LaNiO2 before total reduction. Hydrogen consumption, X-ray diffraction and XANES demonstrate the presence of these new phases. Ni3+ in LaNiO3 becomes Ni2+ in La2Ni2O5, and a pure monovalent nickel phase is obtained in LaNiO2. After this stage nickel leaves the structure as nickel metal. Before total reduction, reversible reoxidation of La2Ni2O5 and LaNiO2 leads to the original structure of the LaNiO3 perovskite.