Summary
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1)
We used the adsorption method to investigate the changes in the pore structure of large-pore magnesium hydroxide during thermal treatment in vacuo.
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2)
During the transition from magnesium hydroxide to oxide at 350° the specific surface increases due to the formation of fine cracks in the primary flakes constituting the large-pore shell of magnesium hydroxide. When the sample is heated at 500° the specific surface somewhat decreases due to a fusion of these fine cracks. The structure of large capillaries does not change at 350 and 500°.
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3)
When heated at 1000° (in vacuo) magnesium oxide undergoes noticeable sintering, but the dimensions of large pores still do not decrease appreciably. At 1400° the large pores also undergo extensive constriction.
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Kiselev, A.V., Neimark, I.E., Poshkus, D.P. et al. Changes in the pore structure during the thermal treatment of magnesium hydroxide. Russ Chem Bull 8, 213–217 (1959). https://doi.org/10.1007/BF00917363
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DOI: https://doi.org/10.1007/BF00917363