Abstract

Surface structures of nonsinterable BeO powders have been studied on the compositions and amounts of gas desorbed from the BeO powders and the adsorption isotherms of water at 25°C. The BeO powders were derived from hydroxide. As a result of our study, following conclusions were obtained.1) The beryllium hydroxide, precipitated homogeneously from sulfate solution, contained many sulfate ions. SO and SO2 gases were desorbed from the BeO powders which had been calcined at temperature less than 1000°C, but little desorption of those occurred above 1000°C.2) Surface structures of the BeO powders, calcined lower temperature, were sensitive to outgassing temperature3) Surface structures of the BeO powders were not sensitive to calcination temperature.4) The largest amount of the chemical adsorption of water was found in the BeO powder which was calcined at 1000°C.5) Outgassing temperature affected strongly the monolayer capacities of physical adsorption of water vapor on the BeO powders which were calcined at lower temperature, but calcination temperature affected weakly them.

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