摘要：

The basic salts of this system were prepared and their structures and physico-chemical properties were studies by electron microscopy, chemical analysis, X-ray powder diffraction, thermal analysis, i.r. absorption spectra, BET absorption, and acidity-basicity measurements. The salts were found to be new compounds analogous to hydrotalcite. They can be expressed by the formula; [M _x ²⁺ M _y ³⁺ (OH)_2(x+y))]^y+ [A _z1 ^? , A_z2^- · mH₂O]^{-(z1 + 2z2)} where M²⁺ and M³⁺ denote di- and trivalent cations, A^? and A^2? denote mono- and divalent anions, respectively, and y = z₁ + 2z₂; z₁ ? z₂.The structures consist of positively charged Cd(OH)₂-like basic layers and intermediate layers formed from anions and water molecules with the solid solution of divalent cation (M²⁺) and trivalent cation (M³⁺) being formed in the range of 0.6 > x/(x + y) > 0.9. The anions of Cl^?, NO ₃ ^? and ClO ₄ ^? are easily substituted by CO ₃ ^2? . A large part of the NO ₃ ^? makes a monodentate-type bond and the ClO ₄ ^? a bridge-type bond.

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