Thermo-Raman spectroscopy of selected layered double hydroxides of formula Cu6Al2(OH)16CO3 and Zn6Al2(OH)16CO3
Frost, Ray L., Soisnard, Aurore, Voyer, Nicolas, Palmer, Sara J., & Martens, Wayde N. (2009) Thermo-Raman spectroscopy of selected layered double hydroxides of formula Cu6Al2(OH)16CO3 and Zn6Al2(OH)16CO3. Journal of Raman Spectroscopy, 40(6), pp. 645-649.
Raman spectroscopy using a hot stage has been used to characterise layered double hydroxides (LDHs) of formula (Cu,Zn)6Al2(OH)16(CO3).4H2O. The spectra have been used to assess the molecular assembly of the cations in the LDH structure. The sharp band at 1058 cm-1 for the Zn6Al2(OH)16(CO3).4H2O is assigned to the ν1 CO32- symmetric stretching mode. The band shifts to higher wavenumbers and is observed at 1103 cm-1 at 600°C. It is proposed that metal carbonate species formed during the decomposition of the hydrotalcite structure is responsible for the increase in band position. The Cu-Al hydrotalcite did not show the same trend. The symmetric stretching mode of carbonate is observed at around 1110 cm-1, and at temperatures above 200 ºC a shoulder appears at around 1210 cm-1, suggested to be due to CuCO3.
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