Results 121 to 130 of about 3,135 (181)

Peptides at vesicle and mineral prebiotic interfaces

Cherepashuk I, Makarov M, Soucek R, Verner V, Krystufek R, Krystufek R, Hadravova R, Giacobelli VG, Fujishima K, Jordan SF, Longo LM, Hlouchova K.   +11 more
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Zirconia–Fluorapatite Materials Produced by HIP

Biomaterials, 1999
Composites of tetragonal zirconia and fluorapatite were sealed in steel tubes and hot isostatically pressed at 1200 degrees C. The phases formed in the samples were evaluated by X-ray powder diffraction. When the composites contained larger amounts of fluorapatite, the tetragonal zirconia changed gradually into the cubic phase with decreasing zirconia ...
Erik Adolfsson
exaly   +3 more sources

Mechanochemical synthesis of nanostructured fluorapatite/fluorhydroxyapatite and carbonated fluorapatite/fluorhydroxyapatite

Journal of Solid State Chemistry, 2004
Powder mixture of Ca(OH)(2)-P2O5-CaF2 were milled in planetary ball mill. A carbonated fluorhydroxyapatite, FHA Ca-10(PO4)(1-y)(CO3)(y)(PO4)(5)(OH)(2-2x1)(F)(2x1) was formed after 5 h of milling and carbonated fluoroapatite Ca-10(PO4)(1-y)(CO3)(y)(PO4)(5)(F)(2) was formed after 9 h of milling.
Nikčević, Irena, Jokanović, Vukoman, Mitrić, Miodrag, Nedić, Z, Makovec, Darko, Uskoković, Dragan   +5 more
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Thermoluminescence of fluorapatite mineral

Journal of Luminescence, 2021
Abstract Fluorapatite [Ca10(PO4)6F2] is a mineral of the apatite group of the highest occurrence in the world among phosphates. The material is known for its diverse luminescent properties, as fluorescent lamps and lasers. The thermoluminescence (TL) signal of apatite from various origins has been investigated in the past years, mainly of the Mexican
G.P.S. Silva, M.C.S. Nunes, C. Ulsen, R. Künzel, E.M. Yoshimura, N.M. Trindade   +5 more
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Fluoride Toxicity in Bioleaching of Fluorapatite

Advanced Materials Research, 2015
The use of biohydrometallurgical processes may be restricted by microbial inhibition due to inhibiting fluoride originating from the feed material. In this work, phosphorus bioleaching experiments on fluorapatite ore were conducted in a reactor using Fe-and S-oxidizing bacteria, resulting in 56 % leaching yield for P, despite abundant (800 mg l-1) F in
Kinnunen, Päivi, Arnold, Mona, Priha, Outi, Sarlin, Tuija, Mäkinen, Jarno   +5 more
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Sintering behaviour of fluorapatite–silicate composites produced from natural fluorapatite and quartz

Ceramics International, 2021
Abstract In this work, the sintering behaviour of fluorapatite (FAp)–silicate composites prepared by mixing variable amounts of natural quartz (2.5 wt% to 20 wt%) and FAp was studied. The composites were pressureless sintered in air at temperatures from 1000 °C to 1350 °C.
D. Kherifi, H. Belhouchet, S. Ramesh, K.Y. Sara Lee, A. Kenzour, S. Djoualah, M.K.G. Abbas, Y.H. Wong, S. Ramesh   +8 more
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Transformation of Hydroxyapatite to Fluorapatite

Soil Science Society of America Journal, 1972
Abstract When solid hydroxyapatite and solid calcium fluoride were equilibrated at 25C with dilute solutions of HCl, analysis of the solutions yielded an average value of 118.8 for the negative logarithm of the ion‐activity product for fluorapatite (10 pCa + 2 pF + 6 pPO 4 ).
D. R. Wier, S. H. Chien, C. A. Black
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A potential model for fluorapatite

Physics and Chemistry of Minerals, 1981
For the mineral fluorapatite, Ca10(PO4)6F2, a potential model of the polarizable ion type has been developed in order to reproduce the following physical constants: the vibrational frequencies (transverse and longitudinal), the elastic constants and the static and high frequency dielectric constants.
V. Devarajan, W. E. Klee
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The Crystallization of Fluorapatite in the Presence of Hydroxyapatite Seeds and of Hydroxyapatite in the Presence of Fluorapatite Seeds

Journal of Colloid and Interface Science, 1997
The kinetics of growth of crystals induced by hydroxyapatite (HAP) seed crystals in supersaturated solutions of fluorapatite and of fluorapatite (FAP) seed crystals in supersaturated solutions of hydroxyapatite have been studied using the constant composition method. The reactions were investigated at relative supersaturations ranging from sigmaFAP = 0.
, Liu, , Sethuraman, , Wu, , Nancollas, , Grynpas   +4 more
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Dislocation Arrangements in Fluorapatite

Journal of Applied Physics, 1969
Some observations on the microstructure of Czochralski-grown fluorapatite, Ca5F(PO4)3, single crystals are presented. From etching and x-ray topographic studies we have found that slip in this material is on (101̄0) planes, with one Burgers vector in the c direction, and another in the basal plane and probably along the [101̄0] direction.
G. M. McManus, R. H. Hopkins, W. J. Takei   +2 more
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