科研之友
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摘要
Layered double hydroxide (LDH) compounds are characterized by structures in which layers with a brucite-like structure carry a net positive charge, usually due to the partial substitution of trivalent octahedrally coordinated cations for divalent cations, giving a general layer formula [(M1-x2+Mx3+)(OH)(2)](x+). This positive charge is balanced by anions which are intercalated between the layers. Intercalated molecular water typically provides hydrogen bonding between the brucite layers. In addition to synthetic compounds, some of which have significant industrial applications, more than 40 mineral species conform to this description. Hydrotalcite, Mg6Al2(OH)(16)[CO3]center dot 4H(2)O, as the longest-known example, is the archetype of this supergroup of minerals. We review the history, chemistry, crystal structure, polytypic variation and status of all hydrotalcite-supergroup species reported to date. The dominant divalent cations, M2+, that have been reported in hydrotalcite supergroup minerals are Mg, Ca, Mn, Fe, Ni, Cu and Zn; the dominant trivalent cations, M3+, are Al, Mn, Fe, Co and Ni. The most common intercalated anions are (CO3)(2-), (SO4)(2-) and Cl-; and OH-, S2- and [Sb(OH)(6)](-) have also been reported. Some species contain intercalated cationic or neutral complexes such as [Na(H2O)(6)](+) or [MgSO4](0). We define eight groups within the supergroup on the basis of a combination of criteria. These are (1) the hydrotalcite group, with M2+:M3+ = 3:1 (layer spacing similar to 7.8 angstrom); (2) the quintinite group, with M2+:M3+ = 2:1 (layer spacing similar to 7.8 angstrom); (3) the fougerite group, with M2+ = Fe2+, M3+ = Fe3+ in a range of ratios, and with O2- replacing OH- in the brucite module to maintain charge balance (layer spacing similar to 7.8 angstrom); (4) the woodwardite group, with variable M2+:M3+ and interlayer [SO4](2-), leading to an expanded layer spacing of similar to 8.9 angstrom; (5) the cualstibite group, with interlayer [Sb(OH)(6)](-) and a layer spacing of similar to 9.7 angstrom; (6) the glaucocerinite group, with interlayer [SO4](2-) as in the woodwardite group, and with additional interlayer H2O molecules that further expand the layer spacing to similar to 11 angstrom; (7) the wermlandite group, with a layer spacing of similar to 11 angstrom, in which cationic complexes occur with anions between the brucite-like layers; and (8) the hydrocalumite group, with M2+ = Ca2+ and M3+ = Al, which contains brucite-like layers in which the Ca:Al ratio is 2:1 and the lame cation, Ca2+, is coordinated to a seventh ligand of 'interlayer' water. @@@ The principal mineral status changes are as follows. (1) The names manasseite, sjogrenite and barbertonite are discredited; these minerals are the 2H polytypes of hydrotalcite, pyroaurite and stichtite, respectively. Cyanophyllite is discredited as it is the 1M polytype of cualstibite. (2) The mineral formerly described as fougerite has been found to be an intimate intergrowth of two phases with distinct Fe2+:Fe3+ ratios. The phase with Fe2+:Fe3+ = 2:1 retains the name fougerite; that with Fe2+:Fe3+ = 1:2 is defined as the new species trebeurdenite. (3) The new minerals omsite (IMA2012-025), Ni2Fe3+(OH)(6)[Sb(OH)(6)], and mossbauerite (IMA2012-049), Fe63+O4(OH)(8)[CO3]center dot 3H(2)O, which are both in the hydrotalcite supergroup are included in the discussion. (4) Jamborite, carrboydite, zincaluminite, motukoreaite, natroglaucocerinite, brugnatellite and muskoxite are identified as questionable species which need further investigation in order to verify their structure and composition. (5) The ranges of compositions currently ascribed to motukoreaite and muskoxite may each represent more than one species. The same applies to the approved species hydrowoodwardite and hydrocalumite. (6) Several unnamed minerals have been reported which are likely to represent additional species within the supergroup. @@@ This report has been approved by the Commission on New Minerals, Nomenclature and Classification (CNMNC) of the International Mineralogical Association, voting proposal 12-B. @@@ We also propose a compact notation for identifying synthetic LDH phases, for use by chemists as a preferred alternative to the current widespread misuse of mineral names.
- 出版日期2012-10
