Alumina coated tungsten evaporation boats air-disp pipette only a thicker coating is

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Alumina coated tungsten evaporation boats air-disp pipette only a thicker coating isThe alumina coated tungsten boat is a combination of the refractory metal tungsten and an alumina barrier (Al2O3) coating over the tab area. The exposed metal area comprising the bottom of the boat allows the sample to be in good thermal contact with the source. The barrier will tend to help concentrate the heat towards the centre. The alumina barrier will inhibit an evaporant (if used as a sample instead of an aperture) from creeping toward the heat

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