Results 131 to 140 of about 3,135 (181)

The surface energy of fluorapatite

Physics Letters A, 1971
Abstract Measurements are reported of the room temperature surface energy for natural crystals of fluorapatite. These were made in air using the slow cleavage method. Values of 95±25 and 480±30 erg cm 2 were obtained for the basal and prismatic planes respectively.
M. Aning, D.O. Welch, B.S.H. Royce
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Surface Charge Characteristics of Hydroxyapatite and Fluorapatite

Nature, 1972
THE crystal and solution chemistry of apatites has been studied intensively by medical, biological and earth scientists but studies of the electrochemistry of apatite surfaces have not been extensive. The few studies of the surface charge characteristics of hydroxyapatite [Ca(OH) (PO)] and fluorapatite [Ca F(PO)] show that H and OH are potential ...
Bell, L. C., Posner, A. M., Quirk, J. P.
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Poisson’s ratio of fluorapatite crystals

Molekulyarnaya Meditsina (Molecular medicine), 2023
Introduction. It is known that in the pathogenesis of caries and non-carious lesions of teeth, an important role is played by enamel resistance, which is determined by numerous factors, among which the structure and physical and mechanical properties of tooth tissues are considered to be among the most important.
S. Muslov, R. Gvetadze, S. Arutyunov
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Rheological behavior of organic suspensions of fluorapatite

Journal of Colloid and Interface Science, 2005
A fluorapatite suspension prepared in the azeotrope methyl ethyl ketone-ethyl alcohol (MEK:EtOH) in the presence of the phosphoric ester was investigated. Electrical conductivity, adsorption isotherms, and sedimentation technique showed that the amount of phosphoric ester adsorbed on the fluorapatite surface was equal to, or higher than, 1 wt%.
Kamel, Chaari, Jamel, Bouaziz, Khaled, Bouzouita   +2 more
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Immobilization of radioactive isotopes in fluorapatite matrices

MRS Proceedings, 2009
AbstractFluorapatite (Fap), Ca10(PO4)6F2, could be a potential candidate for the immobilization of radioactive isotopes thanks both to its physical-chemical properties and to the capability to incorporate mono-, di- and trivalent cations in its crystal structure.
E. Macerata, P. Innocente, MARIANI, MARIO, M. Galletta   +3 more
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Physicochemical Properties of Fluorapatite

1998
Fluoride (F) is a subject of great interest in dental caries research because F, applied in various ways, is the most effective factor in reducing caries. The cariostatic mechanisms of F are complex and have been studied extensively for several decades, and the large body of information in the literature on this subject was reviewed recently.1 ...
Laurence C. Chow, Milenko Markovic
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Internal friction of hydroxyapatite and fluorapatite

Ceramics International, 2004
Abstract Internal friction was measured by a forced torsional vibration method at 0.1–10 Hz in the temperature range of −100 to 400 °C on both hydroxyapatite (HAp) sintered at 1300 °C for 3 h under fluent H 2 O vapor and fluorapatite (FAp) sintered at 1200 °C for 3 h in the F 2 atmosphere.
Suguru Suzuki, Masahiro Sakamura, Masayuki Ichiyanagi, Masakuni Ozawa   +3 more
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Immobilization of Hafnium Surrogates in Fluorapatite

Advances in Science and Technology, 2006
To immobilize the halide and actinide ions present in four Intermediate Level Waste (ILW) waste-streams the following process has been developed at AWE. The waste streams are initially calcined with CaHPO4 to yield apatite which is then sintered with a sodium aluminophosphate glass to produce a monolithic wasteform.
Shirley K. Fong, Lee A. Gerrard, Brian L. Metcalfe, Ian W. Donald   +3 more
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Crystal chemistry of Th in fluorapatite

American Mineralogist, 2010
Through the complementary use of single-crystal X-ray diffraction and X-ray absorption spectroscopy, we present in this paper the first direct results on the site occupancy of thorium in the fluorapatite structure and the structural distortion created by its substitution.
Y. Luo, J. Rakovan, Y. Tang, M. Lupulescu, J. M. Hughes, Y. Pan   +5 more
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Studies on fluorapatite

Calcified Tissue Research, 1973
A mineral specimen from Burgess, Canada, proved upon chemical and crystallographic analyses to be an exceptionally pure sample of fluorapatite. The over-all composition corresponds to $$(Ca^{2 + } )_{9.98} (Sr^{2 + } ,Na^ + ,K^ + ,Mg^{2 + } )_{0.02} (PO_4^{3 - } )_{5.98} (HCO_3^ - ,CO_3^{2 - } )_{0.02} (F^ - )_2 $$ .
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