Journal
INORGANIC CHEMISTRY
Volume 56, Issue 3, Pages 1289-1299Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.6b02445
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Funding
- Council of Scientific and Industrial Research, India (CSIR) [22(612)/12/EMRII]
- CICECO-Aveiro Institute of Materials - FEDER funds through the Operational Programme Competitiveness Factors (COMPETE) [UID/CTM/50011/2013]
- Portuguese Foundation for Science and Technology
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Composites with varied proportions of beta-Ca-3(PO4)(2) and ZnO were obtained through an in situ aqueous precipitation method under slightly basic (pH approximate to 8) conditions. The formation of beta-Ca-3(PO4)(2) phase starts at an early heat-treatment stage (similar to 800 degrees C) and incorporates Zn2+ ions at both Ca2+(4) and Ca2+(5) sites of the lattice up to its occupancy saturation limit. The incorporation of Zn2+ in the beta-Ca-3(PO4)(2) lattice enhances its thermal stability delaying the allotropic beta-Ca-3(PO4)(2)->alpha-Ca-3(PO4)(2) phase transformation. The excess zinc beyond the occupancy saturation limit precipitates as Zn(OH)2 and undergoes dehydroxylation to form ZnO at elevated temperatures. The presence of ZnO in the beta-Ca-3(PO4)(2) matrix yields denser microstructures and thus improves the mechanical features of sintered composites up to an optimal ZnO concentration beyond which it tends to exert an opposite effect.
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