Hydrotalcite can contain carbonate and nitrate ions between its layers. Magnesium can be substituted by nickel, cobalt or copper.[1]
Oxycarbonitrates containing an alkaline earth metal and cuprate and nitrate and carbonate anions in layers, form a family of superconducting materials.[2]
^Chmielarz, Lucjan; Kuśtrowski, Piotr; Rafalska-Łasocha, Alicja; Dziembaj, Roman (2002). "Influence of Cu, Co and Ni cations incorporated in brucite-type layers on thermal behaviour of hydrotalcites and reducibility of the derived mixed oxide systems". Thermochimica Acta. 395 (1–2): 225–236. doi:10.1016/S0040-6031(02)00214-9.