Surface dissolution of calcium phosphate glass ceramics in dilute acid conditions

Autor:	J. M. Villora, P. Callejas, J.O Arzabe, M. F. Barba
Rok vydání:	2003
Předmět:	Glass-ceramic Chemistry Scanning electron microscope Tetracalcium phosphate Phosphate law.invention chemistry.chemical_compound law Materials Chemistry Ceramics and Composites Inductively coupled plasma Citric acid Dissolution Ammonium acetate Nuclear chemistry
Zdroj:	Journal of the European Ceramic Society. 23:2893-2896
ISSN:	0955-2219
DOI:	10.1016/s0955-2219(03)00300-5
Popis:	Calcium phosphate glass–ceramic materials in the P2O5–CaO–SiO2–K2O system were prepared from mineral and industrial waste raw materials. They were characterized by chemical analysis, scanning electron microscopy (SEM) and X-ray diffraction (XRD). Tricalcium phosphate (α and β-Ca3(PO4)2), tetracalcium phosphate (Ca4P2O9) and glassy phases were identified in various proportions. The materials were treated in water, ammonium citrate, ammonium acetate and citric acid solutions. The mechanism of attack of the different phosphate phases in dilute acid conditions was established mainly following the P, Si, Ca, K concentrations versus time by inductively coupled plasma optical emission spectroscopy (ICP–OES). The results show that these glass–ceramic materials can be used as controlled released fertilisers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8a01bcfd43ac7d7b075f585703f42c41 https://doi.org/10.1016/s0955-2219(03)00300-5 Zobrazit plný text záznamu Full Text from ScienceDirect