Phase and melting relationships of β, α and α′-Ca3(PO4)2 polymorphs in the Ca3(PO4)2-Zn3(PO4)2 system. Issue 5 (May 2017)

• Record Type: Journal Article
• Authors: Carbajal, Leticia; Serena, Sara; Sainz, Maria Antonia; Caballero, Angel
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 5(2017)
• Page Start: 2277
• Page End: 2283
• Publication Date: 2017-05
• Subjects: Phase diagram -- Tricalcium phosphate -- Zinc -- Biomaterials; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2016.12.022
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: In order to provide an exact knowledge of the phase transitions and melting relationships of Ca3 (PO4 )2 (TCP) in the presence of zinc, a revisited version of the rich-Ca3 (PO4 )2 region of the phase diagram of the system Ca3 (PO4 )2 -Zn3 (PO4 )2 has been established in the present work. Experimental determination of this diagram was carried out by solid-state reactions of samples prepared from pure NH4 H2 PO4, CaCO3 and ZnO raw materials. X-ray Diffraction, Differential Thermal Analyses and Field Emission Scanning Electron Microscopy studies allowed to revise the α, β, α + β-TCP phase stability fields, delimitating for the first time the biphasic α + α′-TCP field and the melting relationships in the high temperature region of the system. The results allowed to determine two peritectic invariant points, at ≈1400 °C for 95 mol% Ca3 (PO4 )2 and at ≈1490 °C for ≈99.5 mol% Ca3 (PO4 )2 .