The Crystal Chemistry of the "Nickelalumite"-Group Minerals

Uvarova, Yulia; Sokolova, Elena; Hawthorne, Frank C.; Karpenko, Vladimir V.; Agakhanov, Atali A.; Pautov, Leonid A.

doi:10.2113/gscanmin.43.5.1511

Cited by 34 publications

(93 citation statements)

References 12 publications

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“…An LDH comprises two 6 ] 0.75 þ . The structure of the metal hydroxide layer was modeled in this manner using the atomic position coordinates extracted from the published structure of nickelalumite [11] (space group P2 1 /n, cell parameters: a¼ 10.305(3) Å, b¼8.911 (2) Å, c ¼17.141 (2) Å, β¼95.68 (2)1). This provided the partial structure model for the refinement.…”

Section: Structure Of the [Zn-al4-nitrate]ldhmentioning

confidence: 99%

“…Given that the nickelalumite structure has a natural affinity for anions of tetrahedral molecular symmetry [11], the [Zn-Al4-nitrate] LDH is a candidate material for green chemistry applications for efficient sorption of CrO 4 2 À ions from waste water. UV-vis spectra of the chromate intercalated LDH exhibits bands corresponding to that of free chromate indicating intercalation of chromate has occurred (SI.…”

Section: Chromate Uptake Studiesmentioning

confidence: 99%

“…The Zn 2 þ ions and vacancies were reported to be arranged alternatively along the c-crystallographic axis. Subsequently we synthesized the [Zn-Al4-sulfate] LDH starting from bayerite [10] and showed that the compound crystallized in the structure of the mineral nickelalumite [11]. In a recent paper [12], O'Hare's group have completed the refinement of the [M-Al4-nitrate] structure whose preliminary results they had reported earlier [9].…”

Section: Introductionmentioning

confidence: 97%

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Synthesis, structure refinement and chromate sorption characteristics of an Al-rich bayerite-based layered double hydroxide

Britto¹,

Kamath²

2014

Journal of Solid State Chemistry

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a b s t r a c t "Imbibition" of Zn 2 þ ions into the cation vacancies of bayerite-Al(OH) 3 and NO 3 À ions into the interlayer gallery yields an Al-rich layered double hydroxide with Al/Zn ratio $3. NO 3 À ions are intercalated with their molecular planes inclined at an angle to the plane of the metal hydroxide slab and bonded to it by hydrogen bonds. Rietveld refinement of the structure shows that the monoclinic symmetry of the precursor bayerite is preserved in the product, showing that the imbibition is topochemical in nature. The nitrate ion is labile and is quantitatively replaced by CrO 4 2 À ions from solution. The uptake of CrO 4 2 À ions follows a Langmuir adsorption isotherm, thus showing that the hydroxide is a candidate material for green chemistry applications for the removal of CrO 4 2 À ions from waste water. Rietveld refinement of the structure of the hydroxide after CrO 4 2 À inclusion reveals that the CrO 4 2 À ion is intercalated with one of its 2-fold axes parallel to the b-crystallographic axis of the crystal, also the principal 2 axis of the monoclinic cell.

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Section: Structure Of the [Zn-al4-nitrate]ldhmentioning

confidence: 99%

Section: Chromate Uptake Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Synthesis, structure refinement and chromate sorption characteristics of an Al-rich bayerite-based layered double hydroxide

Britto¹,

Kamath²

2014

Journal of Solid State Chemistry

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“…Recent work (Karpenko 2010) showed that the compositions of these crusts are very complicated. They consist of vanadates and sulfates of the chalсoalumite group (Hawthorne and Cooper 2013): alvanite (Pertlik and Dunn 1990), ankinovichite (Karpenko et al 2004a), nickelalumite (Karpenko et al 2004b;Uvarova et al 2005), kyrgyzstanite , volborthite, V-bearing phosphates, Cr-V-bearing members of the alunite subgroup, members of the pascoite family, and vanadium-bronze oxides including metahewettite. Metahewettite was collected from the old exploration trench at Hodzha-Rushnai-Mazar, 2 km east of the village of Valakish (40º10'15"N 72º 06'33"E).…”

Section: Occurrencementioning

confidence: 99%

Metahewettite, Ca(V5+6O16)(H2O)3, from Hodzha-Rushnai-Mazar, southern Kirgizia: occurrence and crystal structure

Cooper¹,

Hawthorne²,

Karpenko³

et al. 2014

J. Geosci.

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Metahewettite was encountered in hypergene crusts in Paleozoic carbon-silica schists included in the carbon mélange matrix at Hodzha-Rushnai-Mazar in southern Kirgizia. Schist outcrops are marked by multicolored yellow, orange, brown and green crusts of vanadates and sulfates of chalсoalumite group, volborthite, V-bearing phosphates, Cr-V-bearing members of alunite subgroup, members of the pascoite group and vanadium-bronze oxides, including metahewettite. Metahewettite is acicular with individual crystals up to 1 mm in length, and forms radial aggregates 2-3 mm in diameter, or flattened aggregates in narrow fissures. Crystals are dark-brown to reddish-brown with a golden sheen. The crystal structure of metahewettite, Ca(V The chains and ribbons link by sharing polyhedron corners to form sheets of V polyhedra parallel to (001). These sheets are linked by interlayer Ca that occupies two interstitial Ca sites, and by (H 2 O) groups.

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“…Because silicate phases are a significant class of minerals observed for natural actinides [1][2][3][4][5][6][7][8], as exemplified by thorite (ThSiO 4 ) [1] and coffinite (USiO 4 ) [3], we are interested in developing synthetic routes from melts that can be used to extend this chemistry to the man-made heavier actinides, Np and Pu. Knowledge in this area is critical to furthering our predictive capabilities regarding the fate and transport of transuranic contaminants in the geosphere [9,10].…”

Section: Introductionmentioning

confidence: 99%

Solid-state syntheses and single-crystal characterizations of three tetravalent thorium and uranium silicates

Jin

Soderholm

2015

Journal of Solid State Chemistry

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Keywords:Thorium Uranium Silicate Solid-state syntheses Single-crystal structure Raman spectroscopy a b s t r a c t Colorless crystals of ThSiO 4 (huttonite) (1) and (Ca 0.5 Na 0.5 ) 2 NaThSi 8 O 20 (2) have been synthesized by the solid-state reactions of ThO 2 , CaSiO 3 , and Na 2 WO 4 at 1073 K. Green crystals of (Ca 0.5 Na 0.5 ) 2 NaUSi 8 O 20 (3) have been synthesized by the solid-state reactions of UO 2 , CaSiO 3 , and Na 2 WO 4 at 1003 K. All three compounds have been characterized by single-crystal X-ray diffraction. Compound 1 adopts a monazitetype three-dimensional condensed structure, which is built from edge-and corner-shared ThO 9 polyhedra and SiO 4 tetrahedra. Compounds 2 and 3 are isostructural and they crystallize in a steacyite-type structure. The structure consists of discrete pseudocubic [Si 8 O 20 ] 8 À polyanions, which are connected by An 4 þ cations into a three-dimensional framework. Each An atom coordinates to eight monodentate [Si 8 O 20 ] 8 À moieties in a square antiprismatic geometry. Na þ and Ca 2 þ ions reside in the void within the framework. Raman spectra of 1, 2, and 3 were collected on single crystal samples. 1 displays more complex vibrational bands than thorite. Raman spectra of 2 and 3 are analogous with most of vibrational bands located at almost the same regions.

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The Crystal Chemistry of the "Nickelalumite"-Group Minerals

Cited by 34 publications

References 12 publications

Synthesis, structure refinement and chromate sorption characteristics of an Al-rich bayerite-based layered double hydroxide

Synthesis, structure refinement and chromate sorption characteristics of an Al-rich bayerite-based layered double hydroxide

Metahewettite, Ca(V5+6O16)(H2O)3, from Hodzha-Rushnai-Mazar, southern Kirgizia: occurrence and crystal structure

Solid-state syntheses and single-crystal characterizations of three tetravalent thorium and uranium silicates

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