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Spherulitic Growth of Apatite in a MgO─CaO─SiO 2 ─P 2 O 5 Glass
Author(s) -
Shyu JiinJyh,
Wu JennMing
Publication year - 1991
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/j.1151-2916.1991.tb07136.x
Subject(s) - apatite , materials science , crystallization , scanning electron microscope , transmission electron microscopy , phase (matter) , mineralogy , differential thermal analysis , analytical chemistry (journal) , differential scanning calorimetry , chemical engineering , crystallography , diffraction , composite material , chemistry , nanotechnology , optics , thermodynamics , physics , organic chemistry , engineering , chromatography
Differential thermal analysis, X‐ray diffraction, scanning electron microscopy with energy dispersive X‐ray analysis, and transmission electron microscopy were used to study the crystallization of a glass with a composition of 11.2 wt% MgO, 40.5 wt% CaO, 33.3 wt% SiO 2 , and 15 wt% P 2 O 5 . A two‐phase “composite,” which was composed of apatite and an intermediate phase (H‐phase), was formed under appropriate heat‐treatment conditions. The spherulitic morphology of apatite phase transformed from “open sheaf” into ellipsoidal as samples were heated to a higher temperature. These phenomena were due to the intermediate H‐phase becoming unstable at this temperature so that the retardation effect on the apatite dendritic growth disappeared.