The solid solutions in the systems La2(CO3)3·8H2O–Ce2(CO3)3·8H2O and La(OH)CO3–Ce(OH)CO3 have been synthesized by the hydrolysis of the lanthanum–cerium trichloroacetates. The X-ray diffraction data of the solid solutions of La2(CO3)3·8H2O–Ce2(CO3)3·8H2O indicated a lanthanite-type structure while the data of La(OH)CO3–Ce(OH)CO3 indicated a bastnaesite-type structure. The correlations between lanthanite, bastnaesite, and calkinsite, and the lanthanite-bastnaesite transformation are discussed.
An interaction between aluminate and silicate ions in highly alkaline solution was investigated by a high-resolution 27Al NMR study. The interaction greatly varied with alkali concentration, and did not occur at 1.0 mol dm−3 NaOH. At 0.10 mol dm−3 NaOH, the formation of a monomeric species with an ≡Al–O–Si≡ bond (Si/Al=1) was suggested and the formation constant was estimated to be 22.8 dm3 mol−1. At 0.015 mol dm−3 NaOH, polynuclear species with ≡Al–O–Si≡ bond was expected to be formed.
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