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Layered double hydroxides containing Ni 2+ and Al 3+ have been synthesized by homogeneous precipitation through urea hydrolysis. The nature of the interlayer species changes according to the treatment of the samples, formation of interlayer (NH 2 )COO - species being observed immediately after precipitation, which undergo transformation to carbonate after hydrothermal treatment. Simultaneously, liberation of ammonia during decomposition under hydrothermal conditions gives rise to formation of [Ni(NH 3 ) 6 ] 2+ species in solution.
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Kloprogge et al. (2006) studied this question.
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