Powder Mixtures Based on Calcium Hydroxyapatite and Sodium Saltsстатья

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Дата последнего поиска статьи во внешних источниках: 20 мая 2019 г.

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1. IMAR726.pdf IMAR726.pdf 1,1 МБ 16 декабря 2018 [safronova]

[1] Powder mixtures based on calcium hydroxyapatite and sodium salts / T. V. Safronova, V. I. Putlyayev, A. V. Knotko et al. // Inorganic Materials: Applied Research. — 2018. — Vol. 9, no. 4. — P. 726–731. Powder mixtures based on calcium hydroxyapatite (HAP) and sodium salts in the amount corresponding to 25 mol % of Na2O in the Na2O–CaO–P2O5 system were studied by isothermal exposures in the range of 600—1200oC. According to XRD data, the phase composition of the samples of HAP/Na2CO3 after calcination included HAP, β-CaNaPO4, and CaO. The phase composition of the ceramic samples from the HAP/Na2HPO4 powder mixture after calcination contained the phases of β-CaNaPO4 and Na4P2O7. The phase composition of the ceramic samples from the powder mixture of HAP/NaH2PO4 after calcination contained Ca2P2O7, Ca10Na(PO4)7, β-CaNaPO4, CaNa2P2O7, and Na4P2O7. The presence of sodium salts in the amount corresponding to 25 mol % of Na2O in the Na2O–CaO–P2O5 system provided the occurrence of liquid-phase sintering in compact preforms from the studied powder mixtures. However, the presence of the water-soluble salt Na4P2O7 in ceramic samples of HAP/Na2HPO4 and HAP/NaH2PO4 after calcination imposes a restriction on the use of such materials in contact with an aqueous medium. And the presence of CaO in the HAP/Na2CO3 samples excludes the use of such materials as bone implants. Keywords: bioceramics, hydroxyapatite, sodium carbonate, sodium hydrogen phosphate, sodium dihydrogen phosphate, tricalcium phosphate, rhenanite, double sodium calcium pyrophosphate, sodium pyrophosphate, Na-substituted tricalcium phosphate The studies are supported by the Russian Foundation for Basic Research (grants nos. 16-08-01172, 16-53-00154, 15-03-09387, 15-38-70047, ofi-15-29-04871). [ DOI ]

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