Observation of absorbed NO in the gas–solid reaction process between NO and LaBaSrCu2O6-δ

Abstract

The absorption of NO onto LaBaSrCu₂O_6-δ is investigated by electron energy-loss spectroscopy and X-ray photoelectron spectroscopy. The results suggest that electron transfer from Cu–O planes to absorbed NO takes place and indicate the formation of chemisorbed states of NO^- on the oxide surface. It is shown that the NO adsorption into the layered cuprate is related to the charge-transfer type electron structure of the cuprates. Also, it is considered that formation of the NO₂^- group corresponding to adsorbed NO^- trapped by oxygen vacancies on the surface, and subsequent solution of N⁺ ions play an important role in the gas–solid reaction between NO and double-layer cuprates.