Raman spectroscopy, 19F and 31P MAS-NMR of a series of fluorochloroapatites

O’Donnell, Matthew; Hill, Rosalind; Law, Robert V.; Fong, Shirley K.

doi:10.1016/j.jeurceramsoc.2008.06.011

Cited by 20 publications

(22 citation statements)

References 24 publications

(32 reference statements)

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“…Chlorapatite and fluorapatite exhibit extensive solid solution phase formation, although the substitution of chlorine and fluorine in the lattice may not be completely random. Forming a mixed fluor/chlorapatite should enable the solubility of the apatite to be controlled.…”

Section: Introductionmentioning

confidence: 99%

Chlorapatite Glass‐Ceramics

Chen

Hill

Karpukhina

2014

Int J of Appl Glass Sci

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Apatite glass‐ceramics are attractive for medical and dental applications, and fluorapatite glass‐ceramics based on aluminosilicate glasses have been extensively studied. This study is the first study of chlorapatite glass‐ceramics based on calcium chloride‐containing Q2 bioactive phosphosilicate glasses. The crystallization behavior of oxychloride glasses is examined and compared with mixed oxychloride/fluoride and oxyfluoride glasses. The glass transition temperature decreased for all three series with increasing halogen content. On increasing the halogen content, there was an increasing tendency of the glasses to crystallize. The halogen‐free glass surface crystallized to pseudowollastonite and an apatite. On incorporating a halide, the glasses exhibited largely bulk crystallization to a haloapatite. In the case of chloride, the glasses crystallized to chlorapatite. This is the first time to our knowledge that chlorapatite has been shown to crystallize from a glass. Chlorapatite is very attractive for medical applications because it converts to hydroxyapatite the mineral phase of tooth and bone on immersion in water.

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Section: Introductionmentioning

confidence: 99%

Chlorapatite Glass‐Ceramics

Chen

Hill

Karpukhina

2014

Int J of Appl Glass Sci

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“…The most intensive vibration of apatite structure in the range 959-965 cm −1 corresponds to the ν 1 vibration of tetrahedron (PO 4 ) 3− . The position of vibration ν 1 of (PO 4 ) 3− in fluorine-rich samples (ApCore, ApRim and ApFib1-2) is at higher wavenumbers of ~962 cm −1 while in chlorine and hydroxyl-enriched samples, it is shifted to ~ 959 cm −1 ; the amount of this shift is proportional to the hydroxyl and chlorine contents at the X anion site (Penel et al 1997;O'Donnell et al 2009). In a similar way, the band position is influenced by the degree of (CO 3 ) 2− substitution for phosphorus (Awonusi et al 2007).…”

Section: Photoluminescence and Raman Spectroscopy Studymentioning

confidence: 99%

“…In the range of ~ 428-450 cm −1 , ν 2 vibration modes of (PO 4 ) 3− are observed in all samples. Shifts from ~ 450 cm −1 to lower wavenumbers of ~440 cm −1 are observable in chlorine-enriched samples ApFib3, ApFib4 and ApFib5 with increasing chlorine content (Penel et al 1997;O'Donnell et al 2009). The most significant shifts of Raman bands influenced by variations in chemical composition at X site and also with increasing carbonate content are found in the range of ~1020-1080 cm −1 which corresponds to ν 3 vibration modes of (PO 4 ) 3− (Penel et al 1998;Awonusi et al 2007;O´Donnell et al 2009).…”

Section: Photoluminescence and Raman Spectroscopy Studymentioning

confidence: 99%

Hydrothermal-to-metasomatic overprint of the neovolcanic rocks evidenced by composite apatite crystals: a case study from the Maglovec Hill, Slanské vrchy Mountains, Slovakia

Mészárosová¹,

Skála²,

Matoušková³

et al. 2018

Geologica Carpathica

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The apatite assemblage from Maglovec hill (Slanské vrchy Mountains near the city of Prešov) from fissures of hydrothermally altered neovolcanic rocks (andesites and related lithologies) was studied. The assemblage consists of two different morphological apatite types (apatite in cores of prismatic crystals and fibrous apatite mantling these cores). The assemblage was investigated by a multi-analytical approach to reveal its unique chemical composition and structure. Both types of apatite display zoning visible in back-scattered electron (BSE) images. Core apatite is relatively homogenous with porous rims appearing darker in the BSE images at the contact with fibrous apatite, and occasionally with darker regions along fractures. These parts are depleted in trace elements, mostly in LREE. Fibrous apatites display concentric and/or patchy zoning. Dark regions in fibrous apatite occasionally display a porous structure. In part of fibrous crystals, substitution of (CO3)2− for phosphorus is confirmed by Raman spectroscopy by the presence of a band at ~ 1071 cm−1. This method also confirmed the presence of OH in different populations in the structure of all apatite types. The three most important observed peaks are caused by vibrations of hydroxyls influenced by different adjacent anions: hydroxyl (band at ~ 3575 cm−1); fluorine (band at ~ 3535–3540 cm−1); chlorine (band at ~ 3494 cm−1). In REE-depleted parts of both apatite types, fine inclusions of monazite and rarely Th-rich silicate are observed. The acquired data suggest a hydrothermal origin of this assemblage and indicate a formation sequence of distinct apatite types. Moreover, minerals from the epidote group were identified, which have not been described from this locality before as well as vanadium-rich magnetites that form exsolution lamellae in ilmenite grains.

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“…The investigations concerned main, minor and trace [ 24 , 25 , 26 ] elements, even in the aspect of the diet [ 27 ]. The observations of role of some minor but important elements such as Mg, Sr, Na, Cl and F in the apatite matrix were conducted [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Such studies were sometimes supported by acid etching at the semimicro scale, treated as proof for the regular change in the chemical resistance of the tooth [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

“…The observations of role of some minor but important elements such as Mg, Sr, Na, Cl and F in the apatite matrix were conducted [28][29][30][31][32][33][34][35][36][37]. Such studies were sometimes supported by acid etching at the semimicro scale, treated as proof for the regular change in the chemical resistance of the tooth [38].…”

Section: Introductionmentioning

confidence: 99%

Novel Approach to Tooth Chemistry: Quantification of Human Enamel Apatite in Context for New Biomaterials and Nanomaterials Development

Kuczumow¹,

Chałas

Nowak³

et al. 2020

IJMS

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A series of linear profiles of the elements of the enamel in human molar teeth were made with the use of an electron microprobe and a Raman microscope. It is postulated that the enamel can be treated as the superposition of variable “overbuilt” enamel on the stable “core” enamel at the macro-, micro- and nanoscale level. The excessive values characterize the “overbuilt enamel”. All the profiles of excessive parameters along the enamel thickness from the enamel surface to the dentin enamel junction (DEJ) can be approximated very precisely with the use of exponential functions, where Ca, P, Cl and F spatial profiles are decaying while Mg, Na, K and CO32− ones are growing distributions. The “overbuilt” apatite formed on the boundary with DEJ, enriched in Na, Mg, OH and carbonates, reacts continuously with Ca, Cl and F, passing into an acid-resistant form of the “overbuilt” enamel. The apparent phases arriving in boundary regions of the “overbuilt enamel” were proposed. Microdiffraction measurements reveal relative variation of energy levels during enamel transformations. Our investigations are the milestones for a further new class of biomaterial and nanomaterial development for biomedical applications.

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Raman spectroscopy, 19F and 31P MAS-NMR of a series of fluorochloroapatites

Cited by 20 publications

References 24 publications

Chlorapatite Glass‐Ceramics

Chlorapatite Glass‐Ceramics

Hydrothermal-to-metasomatic overprint of the neovolcanic rocks evidenced by composite apatite crystals: a case study from the Maglovec Hill, Slanské vrchy Mountains, Slovakia

Novel Approach to Tooth Chemistry: Quantification of Human Enamel Apatite in Context for New Biomaterials and Nanomaterials Development

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