Combined Occupancy of Gadolinium at the Lattice Sites of beta-Ca-3(PO4)(2) and t-ZrO2 Crystal Structures
authors Kumar, PN; Kannan, S; Ferreira, JMF
nationality International
journal EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
author keywords Gadolinium; Calcium; Zirconium; Composites; Lattice structure
keywords BETA-TRICALCIUM PHOSPHATE; X-RAY-ABSORPTION; PREFERENTIAL OCCUPANCY; ZIRCONIA STABILIZATION; VIBRATIONAL PROPERTIES; PHASE-TRANSITIONS; CONTRAST AGENTS; HYDROXYAPATITE; TEMPERATURE; MECHANISMS
abstract An in situ aqueous precipitation with the aid of Gd3+ as a stabilizer has been used to attain a series of beta-Ca-3(PO4)(2)/t-ZrO2 composites. Analytical characterization techniques were used to investigate the formation of desired composite during progressive heat treatments. The transformation of calcium deficient apatite to beta-Ca-3(PO4)(2), which usually occurs at approximate to 780 degrees C for pure systems, is delayed to beyond 1100 degrees C, depending upon the concentration of Gd3+/Zr4+ used in the synthesis. Gd3+ prefers to accommodate at the lattice sites of both beta-Ca-3(PO4)(2) and t-ZrO2. Gd3+ ensures limited occupancy at the Ca2+(1), Ca2+(2), and Ca2+(3) of beta-Ca-3(PO4)(2) while t-ZrO2 consumes the excess Gd3+. Phase pure beta-Ca-3(PO4)(2)/t-ZrO2 composite mixtures devoid of any secondary phase alongside enhanced structural stability were accomplished at 1500 degrees C. The micrographs of the composite specimen revealed good sintering behaviour, and the Youngs modulus and hardness data determined from indentation displayed significant variations depending on the phase content of the individual components in the composite system.
publisher WILEY-V C H VERLAG GMBH
issn 1434-1948
isbn 1099-0682
year published 2020
volume 2020
issue 13
beginning page 1163
ending page 1171
digital object identifier (doi) 10.1002/ejic.201901208
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000514715100001
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journal impact factor 2.529
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