Combined vibrational spectra of natural wardite

Breitinger, Dietrich K.; Belz, H. H.; Hajba, László; Komlósi, Viktória; Mink, J.; Brehm, G.; Colognesi, D.; Parker, Stewart F.; Schwab, R.

doi:10.1016/j.molstruc.2004.01.039

Cited by 24 publications

(37 citation statements)

References 11 publications

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“…Vantasselite is a rare aluminum phosphate mineral with chemical formula given as Al 4 (PO 4 ) 3 (OH) 3 Á9H 2 O. The mineral crystalizes with orthorhombic symmetry, Point Group: 222, unit cell parameters are: Space Group: Pmam, Pma2 or P2 1 am; a = 10.528(4), b = 16.541 (3), c = 20.373 (6) and Z = 8. The crystals occur with lamellar habitus, elongated along 100.…”

Section: Introductionmentioning

confidence: 99%

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A vibrational spectroscopic study of the phosphate mineral vantasselite Al4(PO4)3(OH)3·9H2O

Frost

Scholz

Belotti

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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We have studied the phosphate mineral vantasselite Al₄(PO₄)₃(OH)₃·9H₂O using a combination of SEM with EDX and Raman and infrared spectroscopy. Qualitative chemical analysis shows Al, Fe and P. Raman bands at 1013 and 1027 cm(-1) are assigned to the PO₄(3-)ν₁ symmetric stretching mode. The observation of two bands suggests the non-equivalence of the phosphate units in the vantasselite structure. Raman bands at 1051, 1076 and 1090 cm(-1) are attributed to the PO₄(3-)ν₃ antisymmetric stretching vibration. A comparison is made with the spectroscopy of wardite. Strong infrared bands at 1044, 1078, 1092, 1112, 1133, 1180 and 1210 cm(-1) are attributed to the PO₄(3-)ν₃ antisymmetric stretching mode. Some of these bands may be due to δAl₂OH deformation modes. Vibrational spectroscopy offers a mechanism for the study of the molecular structure of vantasselite.

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Section: Introductionmentioning

confidence: 99%

“…These include wardite and cyrilovite. There have been some studies of the vibrational spectroscopy of wardite [6,7]. Tarte et al collected the infrared spectra of five samples of cyrilovite NaFe 3 (PO 4 ) 2 (OH) 4 Á2(H 2 O) [8] and wardite [7].…”

Section: Introductionmentioning

confidence: 99%

A vibrational spectroscopic study of the phosphate mineral vantasselite Al4(PO4)3(OH)3·9H2O

Frost

Scholz

Belotti

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Infrared bands are observed at 3421, 3228, 3019, 2852 and 2701 cm -1 are attributed to the OH stretching vibrations of c Raman spectrum of ferrostrunzite over the 700-350 cm -1 range the hydroxyl units and water stretching vibration. Breitinger et al [16] found infrared bands at 3520 (vw), 3545 (s), 3585 (sh) and 3613 cm -1 (m) for wardite. Breitinger et al states that the m(OH) modes in the two independent pairs of symmetry-correlated OH groups classify as 2a ?…”

Section: Vibrational Spectroscopymentioning

confidence: 99%

“…Breitinger et al states that the m(OH) modes in the two independent pairs of symmetry-correlated OH groups classify as 2a ? 2b; with the correlation splitting between a and b species depending on the distances in each of the pairs [16]. The m(OH) region of IR spectra of pseudolaueite c Raman spectrum of ferrostrunzite over the 350-100 cm -1 range shows two sharp bands (3241 and 3387 cm -1 ) with two weak shoulders or satellites (3470 and 3532 cm -1 ).…”

Section: Vibrational Spectroscopymentioning

confidence: 99%

A Raman and Infrared Spectroscopic Study of the Phosphate Mineral Pseudolaueite and in Comparison with Strunzite and Ferrostrunzite

2015

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The Raman spectra of pseudolaueite, strunzite, ferrostrunzite and ferristrunzite have been obtained at 298 K using Raman microscopy. These spectra are compared with their infrared spectra. The vibrational spectra of the four minerals are different, in line with differences in crystal structure and composition. Some similarity in the Raman spectra of the hydroxyl-stretching region exists, particularly but characteristic differences in the OH deformation regions are observed. Differences are also observed in the phosphate stretching and deformation regions. Graphical Abstract This paper offers new knowledge and understanding of the mineral pseudolaueite of formula Mn 2? Fe 2 3? (PO 4 ) 2 (OH) 2 Á8H 2 O,a hydrated hydroxy phosphate of ferric iron and manganese.

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“…This band is assigned to the n 1 symmetric stretching mode. Breitinger et al [23] assigned a band at 1108 cm À1 for synthetic augelites to this mode. The position is in sharp contrast to the value of 930 cm À1 published by Farmer.…”

Section: Vibrational Spectroscopymentioning

confidence: 99%

The Molecular Structure of the Phosphate Mineral Väyrynenite: A Vibrational Spectroscopic Study

Frost

López

et al. 2014

Spectroscopy Letters

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We have studied the mineral väyrynenite from the Viitaniemi pegmatite, located in the Eräjärvi area of Finland, using a combination of electron microscopy, electron microprobe, and vibrational spectroscopic techniques. Chemical analysis shows the formula of the mineral to be (Mn 0.88 ,Fe 0.08 ,Mg 0.01 ) P 0.97 Be 1.02 (PO 4 ) 1.00 (OH) 1.02 . Vibrational spectroscopy enables an assessment of the molecular structure of väyrynenite. An intense Raman band at 1004 cm À1 is to the PO 3À 4 n 1 symmetric stretching mode. The observation of multiple bands in the phosphate stretching region offers support for the concept of different phosphate units in the väyrynenite structure. Infrared spectroscopy confirms this multiplicity of vibrational bands. Multiple bands are observed in the phosphate bending region.

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Combined vibrational spectra of natural wardite

Cited by 24 publications

References 11 publications

A vibrational spectroscopic study of the phosphate mineral vantasselite Al4(PO4)3(OH)3·9H2O

A vibrational spectroscopic study of the phosphate mineral vantasselite Al4(PO4)3(OH)3·9H2O

A Raman and Infrared Spectroscopic Study of the Phosphate Mineral Pseudolaueite and in Comparison with Strunzite and Ferrostrunzite

The Molecular Structure of the Phosphate Mineral Väyrynenite: A Vibrational Spectroscopic Study

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