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- W3036792958 abstract "The availability of clean and thin substrates with micron-size single crystalline areas and a low defect density is a prerequisite for meaningful in-situ TEM epitaxial nucleation and growth studies. We are now reporting two related techniques for producing such electron transparent films of α-Al 2 O 3 (sapphire). They have the added advantage of exhibiting grains of various crystallographic orientations. A 1000 Å thick film of amorphous Al 2 O 3 , obtained by electrolytic oxidation of aluminum foil and subsequent chemical separation from the metal, was mounted on a 200 mesh W grid in the hot stage of the uhv specimen chamber of a 100 KV TEM equipped for in-situ experimentation. Electron-beam flash-heating with a 5-50 μm diameter beam at several A/cm 2 current density (by removing the condenser 2 aperture and turning condenser 1 off) produced sapphire regions of 5-100 μm in size with several large grains. The size of the recrystallized areas increased with increasing duration of the flash (0.1 sec. to 1 sec.) and increasing beam current and diameter. According to Chang and our in-situ nucleation results with metal deposits, the sapphire surface is atomically clean after such high temperature treatment. The example of Fig. 1 shows recrystallization to a single grain. Thermal preheating of the amorphous film up to 800°C produced very fine polycrystalline Al 2 O 3 , but had no apparent effect on the result of subsequent e-beam recrystallization." @default.
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- W3036792958 date "1981-08-01" @default.
- W3036792958 modified "2023-09-26" @default.
- W3036792958 title "In-Situ Formation of Clean, Single Crystal, and Electron Transparent Sapphire Substrates" @default.
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- W3036792958 doi "https://doi.org/10.1017/s0424820100097442" @default.
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