Fourier transform infrared spectroscopic study of hydroxylpyromorphite Pb10(PO4)6OH2–hydroxylmimetite Pb10(AsO4)6(OH)2 solid solution series

Kwaśniak-Kominek, Monika; Matusik, Jakub; Bajda, Tomasz; Manecki, Maciej; Rakovan, John; Marchlewski, T.; Szala, Barbara

doi:10.1016/j.poly.2015.07.002

Cited by 25 publications

(9 citation statements)

References 26 publications

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“…The results of wet chemical analysis presented in Table 1 are in accordance with the intended composition of products of synthesis as well as with the EDS data [27]. Dutrizac [32] do not apply here.…”

Section: Resultssupporting

confidence: 79%

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Arsenate substitution in lead hydroxyl apatites: A Raman spectroscopic study

Giera

Manecki

Bajda

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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A total of seven compounds of the hydroxylpyromorphite Pb10(PO4)6(OH)2 - hydroxylmimetite Pb10(AsO4)6(OH)2 (HPY-HMI) solid solution series were synthesized at 80°C from aqueous solutions and characterized using Raman spectroscopy. The positions of the bands in all spectra of the series depend on the content of arsenates and phosphates shifting to lower wavenumbers with substitution of (AsO4)(3-) for (PO4)(3-). This shift results from the decreasing bond strength of X-O (where X=P, As) and higher atomic mass of As than P. The position and intensity of major (PO4)(3-) and (AsO4)(3-) bands in Raman spectra exhibit linear correlation with As content, while the ratio of the intensities of these peaks shows exponential correlation. This results due to different polarizability of (PO4)(3-) and (AsO4)(3-) molecules. A small carbonate band develops with increasing As content indicating that hydroxyl lead apatites adopt the (CO3)(2-) ions, particularly at the arsenate end of the series.

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Section: Resultssupporting

confidence: 79%

“…morphology, chemical composition and XRD patterns and crystal lattice parameters) are presented elsewhere [27]. Briefly, the samples were precipitated from aqueous solutions in [27]. In addition to the EDS data presented therein, the composition of the synthetic phases was determined by wet chemical analysis.…”

Section: Methodsmentioning

confidence: 99%

Arsenate substitution in lead hydroxyl apatites: A Raman spectroscopic study

Giera

Manecki

Bajda

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…The current refinement of Pb 5 (AsO 4 ) 3 (OH) is based on the first single-crystal study and reports all atoms with anisotropic displacement parameters. The previously given unit cell parameters from room-temperature powder data are slightly larger than those of the current single-crystal study (Table 1): a = 10.154, c = 7.515 Å, V = 671.02 Å 3 [49]; a = 10.187, c = 7.523 Å, V = 676.303(13) Å 3 [22]; a = 10.14 (8), c = 7.50(1) Å, V = 669 Å 3 [50]. Unit cell parameters predicted from elemental radii using pattern recognition and artificial intelligence methods, a = 9.8939, c = 7.6039 Å, V = 644.617 Å 3 [51], are much smaller than all experimentally determined values.…”

Section: Pb 5 (Aso 4 ) 3 Ohcontrasting

confidence: 66%

Crystal Structure Refinements of the Lead(II) Oxoarsenates(V) Pb2As2O7, Pb(H2AsO4)2, Pb5(AsO4)3OH and NaPb4(AsO4)3 from Single-Crystal X-ray Data

Weil

2021

Minerals

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Single-crystals of lead(II) oxoarsenates(V) were grown from the melt (Pb2As2O7), from solution (Pb(H2AsO4)2 and Pb5(AsO4)3OH), and under hydrothermal conditions (NaPb4(AsO4)3). Crystal structure refinements from single-crystal X-ray diffraction data revealed isotypism for both Pb2As2O7 and Pb(H2AsO4)2 with the corresponding barium and phosphate phases. A quantitative comparison of the crystal structures showed a high similarity for the isotypic M2X2O7 structures (M = Pb, Ba; X = As, P), whereas for the M(H2XO4)2 structures only the pair Pb(H2AsO4)2 and Pb(H2PO4)2 is similar, but not Ba(H2AsO4)2. Pb5(AsO4)3OH adopts the apatite structure type in space group P63/m, with the hydroxyl group disordered around Wyckoff position 2 b (0, 0, 0) in the channels of the structure. NaPb4(AsO4)3 represents a lacunar apatite with two of the three metal positions occupationally disordered by Pb and Na. In contrast to a previous X-ray powder study of NaPb4(AsO4)3 that reported an apatite-type structure in space group P63/m, the current single-crystal data clearly revealed a symmetry reduction to space group P-3. Hence, NaPb4(AsO4)3 is the first lacunar apatite that comprises only tetrahedral anions and adopts the belovite structure type.

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“…Several chemical analyses of natural apatite supergroup minerals formed in the oxidation zone indicate that the elemental composition of apatites mirror the composition of the aqueous solutions from which they precipitate [18,20]. Several synthesis experiments have also shown that the composition of products can be accurately controlled by the composition of the initial solutions [11,17,[21][22][23][24][25][26][27][28]. Hence, induced apatite precipitation can be used to immobilize pollutants in contaminated soils, waste, or waters.…”

Section: Introductionmentioning

confidence: 99%

Structural Assessment of Fluorine, Chlorine, Bromine, Iodine, and Hydroxide Substitutions in Lead Arsenate Apatites (Mimetites)–Pb5(AsO4)3X

et al. 2020

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Five lead-arsenate apatites (mimetites)-Pb5(AsO4)3X—where X denotes fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and hydroxide (OH)—were synthesized via precipitation from aqueous solutions. The crystal structures were determined through Rietveld refinement of powder synchrotron X-ray data. All the compounds crystallized in the hexagonal class symmetry (space group P63/m). The Rietveld refinement indicated that mimetite-Cl, -Br, -I, and -OH had an anion deficiency at position X. Substitution of halogens in a mimetite structure brought about systematic changes in unit-cell parameters, interatomic distances, and metaprism twist angles φ, proportional to the substituted halogen’s ionic radius. Mimetite-OH did not follow the linear correlations determined within the series. Twist angle φ, a useful device for monitoring changes in apatite topology, ranged from 20.34° for mimetite-F to 11.42° for mimetite-I. The geometric method has been proposed for determining the diameter of hexagonal channels hosting halogens in apatites. A comparison of the results with halogenated pyromorphites showed similar systematic trends: the substitutions in mimetites have comparable effect on the interatomic distances as in their phosphorous analogues.

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Fourier transform infrared spectroscopic study of hydroxylpyromorphite Pb10(PO4)6OH2–hydroxylmimetite Pb10(AsO4)6(OH)2 solid solution series

Cited by 25 publications

References 26 publications

Arsenate substitution in lead hydroxyl apatites: A Raman spectroscopic study

Arsenate substitution in lead hydroxyl apatites: A Raman spectroscopic study

Crystal Structure Refinements of the Lead(II) Oxoarsenates(V) Pb2As2O7, Pb(H2AsO4)2, Pb5(AsO4)3OH and NaPb4(AsO4)3 from Single-Crystal X-ray Data

Structural Assessment of Fluorine, Chlorine, Bromine, Iodine, and Hydroxide Substitutions in Lead Arsenate Apatites (Mimetites)–Pb5(AsO4)3X

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