We used a suite of transmission electron microscopy (TEM) and associated electron spectroscopy methods to examine the local structure and changes in the electronic structure of LinormalNi0.8normalCo0.15normalAl0.05normalO2 positive electrode material. We found a scattered rock-salt phase near grain surfaces and grain boundaries, where Ni3+ turned to Ni2+ , deduced from relative intensity ratios and fine structures of the L2,3 white-line peaks of the transition metals. The spatial distribution of the degraded phase throughout the secondary particle was found using a scanning TEM-electron energy loss spectroscopy spectral imaging technique and multivariate analysis. The degradation process and its relationship to the surface reactions with electrolytes is discussed based on the spatial-distribution map of the degraded phases.

Transparent Si nanosheets with a thickness of 0.37 nm are produced by chemically exfoliating calcium disilicide with propylamine hydrochloride (PA⋅HCl; see picture, Ca white, Si red). The nanosheets have a two‐dimensional silicon backbone and are an order of magnitude thinner than previously reported silicon nanostructures.

The microstructural development of crystalline-oriented (K 0.5 Na 0.5 )NbO 3 (KNN)-based piezoelectric ceramics during sintering was investigated. The addition of CuO as a sintering aid was found to be effective for fabricating highly oriented and dense KNN ceramics. KNN specimens containing 0.5-1.0 mol% CuO sintered at 11001C for 1 h were found to have relative densities and pseudo-cubic {100} orientation degrees of 95% or higher. In the early stages of sintering, KNN is formed in the reaction between complementary reactants NaNbO 3 and KNbO 3 , after which oriented grain growth proceeds at a relative density of more than 90%. In addition, the results of transmission electron microscopy observation showed that textured KNN ceramics have a unique pectinate-like domain structure with domain walls consisting of {101} planes. 1951J ournal

Transparente Si‐Nanoschichten mit einer Dicke von 0.37 nm wurden durch chemische Schichtkorrosion von Calciumdisilicid mit Propylamin‐hydrochlorid (PA⋅HCl) erzeugt (siehe Bild, Ca weiß, Si rot). Die Nanoschichten haben ein zweidimensionales Siliciumrückgrat und sind eine Größenordnung dünner als bisher bekannte Siliciumnanostrukturen.

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