Characterization of the ion-plated TiN on AISI 304 stainless steel by energy filtering transmission electron microscopy

[[abstract]]The microstructure and chemistry of TiN on AISI 304 stainless steel is characterized using filtering transmission electron microscopy (TEM) equipped with an electron energy loss spectroscopy (EELS) detector. It is shown that the microstructure of the ion-plate-TiN coatings is thickness dependent. The as-prepared TiN films have a grain size ranging from 88 nm at the coating surface down to 9 nm near the TiN/steel interface. A slightly textured microstructure is observed for the surface layer TiN. Analyzed by EELs, it is obtained that the relative oxygen content increases linearly from the TiN surface to the TiN/steel interface, whereas the relative nitrogen content first decreases slowly and then drops rapidly near the interface. The presence of Ti2N, along with deficiency in nitrogen near the interface, suggests that TiN produced in early deposition may be nonstoichiometric.[[fileno]]2060134010018[[department]]工程與系統科學

The Study of the Dislocation Structure and Energy of NiO-Pt Interfaces

AbstractThe dislocation structure of Pt-(001)NiO interfaces was studied using electron microscopy and electron diffraction techniques. Specimens were produced by hot pressing polycrystalline Pt films on to thin NiO single crystals, and bulk Pt single crystals on to bulk NiO single crystals. The polycrystalline Pt specimens were used to determine the favored orientation relationships between the NiO and Pt, while the bulk NiO-Pt specimens were used to study the detailed structure of the interface. Three categories of orientation relationships were identified: exact epitaxy with (001)Pt ║ (001)NiO, [110]Pt ║ [110]NiO; small rotations away from exact epitaxy about the common [001] direction; high index planes of Pt parallel to (001) of NiO. Theoretical calculations of the expected dislocation structures of interfaces with the first two orientation relationships were made using a Bollmann-type analysis. The experimental observations and theoretical predictions were shown to be in good agreement. The energies of the interfaces having the first two orientation relationships were shown to be similar which is believed to be the reason why they both occur.</jats:p