The CaO formed by complete isothermal decomposition of calcite single crystals in vacuum has surface areas that range from 127.10 m 2 g at 650°C to 60 ± 20 m 2 /g at 900°C. Surface areas are not significantly reduced by annealing at 900°C in vacuum. SEM observations and other available data show that CaO particles, which are first formed in an aggregate with relatively uniform pores, rearrange when the CaO layer thickness exceeds =10 to 50 μm.
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Powell et al. (1982) studied this question.
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