Abstract
A study was made on the compositions and amounts of gases desorbed from BeO powders in the temperature range between 200° and 1100°C and the adsorption isotherms of water at 25°C on the powders which had been pretreated at 600°, 800° and 1000°C. The BeO powders were obtained by calcination of sulfate. These measurements showed that the BeO powders were changed in the surface structure or surface state as the calcination temperature was raised and the following conclusions were obtained from the present study.1) The BeO powders, calcined at lower temperature, adsorb or absorb SO and SO2 and are disordered in their surface structure. The structure are sensitive to the pretreatments.2) The amounts of gases desorbed from S900 BeO and S1200 BeO in the temperature range between 800° and 1000°C are much more than those between 600° and 800°C. The amounts of SO and SO2 desorbed from S900 BeO and those of CO and CO2 desorbed from S1200 BeO increase from 800°C, reach maximum at about 900°C and then decrease with increasing outgassing temperature.3) The surface structures are more ordered with the calcination temperature to about 1000°C but above this temperature they become again disordered, particularly at 1200°C.4) The monolayer capacities of physisorbed water are not affected by the calcination temperature.
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