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Structural changes during crystallization of apatite and wollastonite in the eutectic glass of Ca 3 (PO 4 ) 2 ‐CaSiO 3 system
Author(s) -
MagallanesPerdomo Marlin,
De Aza Antonio H.,
Sobrados Isabel,
Sanz Jesús,
Luklinska Zofia B.,
Pena Pilar
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14943
Subject(s) - wollastonite , materials science , crystallization , apatite , nucleation , amorphous solid , mineralogy , eutectic system , microstructure , magic angle spinning , glass ceramic , scanning electron microscope , chemical engineering , transmission electron microscopy , anorthite , analytical chemistry (journal) , crystallography , ceramic , composite material , chemistry , nanotechnology , nuclear magnetic resonance spectroscopy , raw material , organic chemistry , chromatography , engineering
In this study, a bioactive glass of eutectic composition based on Ca 3 (PO 4 ) 2 ‐CaSiO 3 system was prepared and investigated. It was found that by controlling the nucleation and growth of crystals, a glass‐ceramics free from cracks, containing one or two crystalline phases, and of controlled nano‐ to microscale microstructure can be obtained. Heat treatment of the parent glass produces various calcium phosphates (Ca‐deficient apatite and α‐tricalcium phosphate) and calcium silicates (pseudo‐wollastonite and/or wollastonite‐2M) plus amorphous phases. By combining a number of experimental techniques like 31 P and 29 Si magic angle spinning nuclear magnetic resonance spectroscopy, scanning and transmission electron microscopy, energy‐dispersive X‐ray spectrometry, and Rietveld analysis of X‐ray diffraction patterns, a crystallization model was derived, capable of explaining the observed structural and microstructural changes. The determination of amorphous or crystalline phases enabled to produce time‐temperature‐transformation plots. The structural role on the behavior of these materials and its impact on their in vitro bioactivity are also discussed.