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LDHs can be seen as derived from hydroxides of divalent cations (d) with the brucite (Mg(OH) 2) layer structure [AdB AdB] n, by cation (c) replacement (Mg 2+ → Al 3+), or by cation oxidation (Fe 2+ → Fe 3+ in the case of green rust, Fe(OH) 2), in the metallic divalent (d) cation layers, so as to give them an excess positive electric charge; and intercalation of extra anion layers (Z ...
AFm phases belong to the class of layered double hydroxides (LDH). LDHs are hydroxides with a double layer structure. The main cation is divalent (M 2+) and its electrical charge is compensated by 2 OH − anions: M(OH) 2. Some M 2+ cations are replaced by a trivalent one (N 3+). This creates an excess of positive electrical charges which needs ...
Hydrotalcite, or formerly also völknerite, [6] is a layered double hydroxide (LDH) of general formula Mg 6 Al 2 CO 3 (OH) 16 ·4 H 2 O, whose name is derived from its resemblance with talc and its high water content. Multiple structures containing loosely bound carbonate ions exist.
Friedel's salt is an anion exchanger mineral belonging to the family of the layered double hydroxides (LDHs). It has affinity for anions as chloride and iodide and is capable of retaining them to a certain extent in its crystallographical structure.
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A number of mixed hydroxides are known with stoichiometry A 3 M III (OH) 6, A 2 M IV (OH) 6, and AM V (OH) 6. As the formula suggests these substances contain M(OH) 6 octahedral structural units. [46] Layered double hydroxides may be represented by the formula [M z+ 1−x M 3+ x (OH) 2] q+ (X n−) q ⁄ n ·yH 2 O.
It is the archetype of the fougèrite group in the larger hydrotalcite supergroup of naturally occurring layered double hydroxides. [4] The structure is based on brucite-like layers containing Fe 2+ and Fe 3+ cations, O 2− and OH − anions, with loosely bound [CO 3] 2− groups and H 2 O molecules between the layers.
Download as PDF; Printable version; In other projects Wikidata item; ... is an anion exchanger mineral belonging to the family of the layered double hydroxides (LDHs).