2八面体型スメクタイトの加熱処理による構造変化

抄録

Structural rearrangements for dioctahedral smectite after thermal treatment were investigated. The notable structural changes accompanying removal of interlayer water are contraction of basal spacing, migration of interlayer cation into silicate layer and expansion of b-parameter. The important factor affecting the migration of interlayer cation is considered to be turbostatic stacking of adjacent silicate layers. The dehydroxylated structures of octahedral sheet are similar to those of other dioctahedral clay minerals having 2:1 layer structure, that is, removal of 2OH- as H₂O and relocation of residual O^2- to the same level as that of the octahedral cations.