Abstract
Synthetic hydrotalcite-like samples with composition [M1 − x 2+Alx 3+(OH)2](CO3)x/2 ·nH2O, where M = Mg, Ni, x = 0.25 and 0.33, n = 2x and 1.5x, are studied by XRD, DTA, TG and IR spectroscopy after heating in the temperature interval 120–260 °C and rehydration in air and water. Structural models of the two metaphases obtained are proposed. Metahydrotalcite-D (HT-D) is formed at 140–180 °C by the reversible dehydration of the interlayer. Metahydrotacite-B (HT-B) is formed at temperatures 240–260 °C as a result of the dehydroxilation of a part of OH groups of the brucite-like layer and inclusion of two oxygenes from the CO3-group in the same layer. The HT-B has a specific crystal structure. Rehydration does not restore the initial structural state but leads to the formation of a phase (HT-B-r) characterized with increased thickness of the interlayer, high content of water and a low temperature of dehydration. The properties of HT-B depend on the ratio M2+: Al of the initial sample. The substitution Mg ↔ Ni does not influence the properties of the metaphases in the low temperature region.
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Stanimirova, T., Vergilov, I., Kirov, G. et al. Thermal decomposition products of hydrotalcite-like compounds: low-temperature metaphases. Journal of Materials Science 34, 4153–4161 (1999). https://doi.org/10.1023/A:1004673913033
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DOI: https://doi.org/10.1023/A:1004673913033