The Crystal Structure of Apatite, Ca5(PO4)3(F,OH,Cl)

Hughes, John M.; Rakovan, John

doi:10.2138/rmg.2002.48.1

Cited by 216 publications

(161 citation statements)

References 13 publications

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“…To test this hypothesis, we performed ab initio computations of interfacial FAP/CAS relationships. Using the COMPASS force field package 37 , the three structures were first constructed and verified against established crystal structure lattices 38 . Various interfacial crystallographic relationships were tested, and the [100] FAP //[100] CAS gave the best interfacial lattice matching (Fig.…”

Section: Discussionmentioning

confidence: 99%

Textured fluorapatite bonded to calcium sulphate strengthen stomatopod raptorial appendages

et al. 2014

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Stomatopods are shallow-water crustaceans that employ powerful dactyl appendages to hunt their prey. Deployed at high velocities, these hammer-like clubs or spear-like devices are able to inflict substantial impact forces. Here we demonstrate that dactyl impact surfaces consist of a finely-tuned mineral gradient, with fluorapatite substituting amorphous apatite towards the outer surface. Raman spectroscopy measurements show that calcium sulphate, previously not reported in mechanically active biotools, is co-localized with fluorapatite. Ab initio computations suggest that fluorapatite/calcium sulphate interfaces provide binding stability and promote the disordered-to-ordered transition of fluorapatite. Nanomechanical measurements show that fluorapatite crystalline orientation correlates with an anisotropic stiffness response and indicate significant differences in the fracture tolerance between the two types of appendages. Our findings shed new light on the crystallochemical and microstructural strategies allowing these intriguing biotools to optimize impact forces, providing physicochemical information that could be translated towards the synthesis of impact-resistant functional materials and coatings.

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Section: Discussionmentioning

confidence: 99%

Textured fluorapatite bonded to calcium sulphate strengthen stomatopod raptorial appendages

et al. 2014

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“…The first migration mechanism occurs via a V Ca (1) , down the c-axis by migration between four identical sites Ca(1) ? Ca(1) ?…”

Section: Cation Migrationmentioning

confidence: 99%

“…This is due to both the thermal and chemical stability of the mineral over geological timescales and the ability of apatite mineral phases to adopt a wide range of compositions and stoichiometries [1]. This allows considerable compositional flexibility and offers the potential to dissolve and immobilise radioisotopes, in the presence of halides, which are difficult to accommodate in traditional vitreous or cement type waste forms [2].…”

Section: Introductionmentioning

confidence: 99%

Divalent cation diffusion in calcium fluorapatite

et al. 2011

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The mechanisms by which calcium ions are transported through the fluorapatite lattice are investigated using computer simulations. Cation vacancy assisted pathways are considered and migration energy barriers are calculated using a nudged elastic band transition state search. Migration activation energies for a range of divalent cations, in addition to calcium are compared. Generally there is very little change in activation energy as cation radius increases. Furthermore, in all cases the lowest energy migration pathways occur parallel to the c-axis either associated with the central anion channel via Ca(2) sites or away from the channel and via Ca(1) sites.

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“…The general formula of apatite is Ca 5 (PO 4 ) 3 (OH,F,Cl) depending on the last functional group. It is referred to as hydroxy-, ﬂuoro-, or chloro-apatite (Hughes and Rakovan 2002). The most common gangue minerals in RPss are quartz, chert, clay, feldspar, mica, calcite, and dolomite (Heydarpoura et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Isolation and identification of a phosphate solubilising fungus from soil of a phosphate mine in Chaluse, Iran

et al. 2016

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Microbial solubilisation of phosphorus from insoluble phosphates is an environmental friendly and cost effective approach in sustainable soil management. Introducing the indigenous microorganisms to soil requires shorter adaptation period and causes fewer ecological distortions than exogenous microorganisms. This study was conducted to isolate and identify the indigenous fungi for phosphate solubilisation in Mazandaran, Iran. A potent phosphate solubilising fungus was isolated from an Iranian phosphate mine and selected for solubilisation of rock phosphate (RP). The identified fungus was characterised by calmodulin-based polymerase chain reaction method as Aspergillus tubingensis SANRU (Sari Agricultural Sciences and Natural Resources University). The phosphate solubilisation ability of the fungal strain was carried out in shake-flask leaching experiments containing various concentrations of RP (1%, 2%, 4%, or 8% w/v). The maximum P solubilisation rate of 347 mg/l was achieved at 1% of RP concentration on day 9. The regression analysis indicated that the P solubilised mainly through acidification. This study shows the possibility of using A. tubingensis SANRU for application in the management of P fertilisation.

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The Crystal Structure of Apatite, Ca5(PO4)3(F,OH,Cl)

Cited by 216 publications

References 13 publications

Textured fluorapatite bonded to calcium sulphate strengthen stomatopod raptorial appendages

Textured fluorapatite bonded to calcium sulphate strengthen stomatopod raptorial appendages

Divalent cation diffusion in calcium fluorapatite

Isolation and identification of a phosphate solubilising fungus from soil of a phosphate mine in Chaluse, Iran

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