Abstract
Ni12xAlx(OH)2(CO3) x/2iyH2O. 2‐ 6 The Ni ions in Ni(OH)2 occupy the octahedral holes between alternate pairs of OH planes and thus form a triangular lattice identical to that adopted by the OH ions. The two planes of OH ions, with the plane of Ni atoms between them, form a brucitelike layer of the host structure. 7 Ni(OH)2 can exist in two polymorphous crystal structures denoted as a and b. Both structures consist of brucitelike layers that are well ordered in the b phase and randomly stacked in the a phase. The interlayer spacing ~gallery! in the a phase is usually significantly larger than that in the b phase due to the large number of water molecules and anionic species that can penetrate into the galleries. 8
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