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- W1972028963 abstract "Des copre´cipite´s de phosphates de calcium, magne´sium onte´te´pre´pare´s par copre´cipitation rapide en milieu eau-e´thanol. Ils onte´te´examine´s par analyse chimique, diffraction des rayons X, microdiffractione´lectronique, spectroscopie infrarouge, microscopiee´lectronique en transmission (STEM), analyse pare´nergie dispersive des rayons X (EDAX), spectroscopie photoe´lectronique (ESCA). On constate que lorsque le rapport atomiqueMg(Ca + Mg), de´signe´parRc, dans les copre´cipite´s est compris entre 6 et 44%, ces derniers pre´sentent un rapport atomique(Ca + Mg)P constant ete´gala`1,23. Les diffe´rentes techniques d'analyse montrent que le magne´sium n'est pasa`la surface des copre´cipite´s de rapportRc compris entre 6 et 44%, mais inclus dans le phosphate, et qu'il s'agit de solides monophase´s. Ces compose´s se caracte´risent par leur rapport(Ca + Mg)P, leur teneur en protone´leve´e et la limite de solubilite´en magne´sium importante. Obtenusa`l'e´tat amorphe, ces compose´s subissent une cristallisation au cours du temps, et pre´sentent un diagramme de diffraction des RX et un spectre IR comparablesa`ceux de la whitlockite. Lorsque le rapportRc est supe´rieura`20%, il apparaita`coˆte´de la phase de structure PTC-β, une phase amorphe, phosphate de calcium magne´sium, riche en magne´sium. La solubilite´du magne´sium dans le phosphate de calcium diminue lorsque le syste`mee´volue vers dese´tats thermodynamiquement plus stables. Samples of calcium, magnesium phosphate were rapidly precipitated in ethanol-water solution. They were examined by chemical analysis, X-ray diffraction, electronic microdiffraction, infrared spectroscopy, transmission electronic microscopy (STEM), X-ray dispersive energy analysis (EDAX), and photoelectronic spectroscopy (ESCA). When the atomic ratioMg(Ca + Mg), Rc, in the precipitates is increased from 6 to 44%, the atomic ratio(Ca + Mg)P remains constant and equal to 1.23. Various analytical techniques show that magnesium is included in the precipitates and not at their surfaces. The precipitates forRc in the range between 6 and 44% are amorphous. Those near the upper limit are characterized by their atomic ratio(Ca + Mg)P, their high amount of proton, and their high solubility limit of magnesium. These amorphous compounds ultimately crystallize; their X-ray diffraction diagram and IR spectrum are similar to those of whitlockite. When the atomic ratioRc is greater than 20%, and close to the phase with the β-TCP structure, an amorphous phase is encountered containing considerable magnesium. The magnesium solubility in the calcium phosphate decreases when the system evolves to more stable thermodynamical states." @default.
- W1972028963 created "2016-06-24" @default.
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- W1972028963 date "1990-02-01" @default.
- W1972028963 modified "2023-09-26" @default.
- W1972028963 title "Influence de l'e´tat cristallin sur la solubilite´du magne´sium dans les orthophosphates de calcium" @default.
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- W1972028963 doi "https://doi.org/10.1016/0022-4596(90)90332-r" @default.
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