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New Approach to the β→α Polymorphic Transformation in Magnesium‐Substituted Tricalcium Phosphate and its Practical Implications
Author(s) -
Carrodeguas Raúl García,
De Aza Antonio H.,
Turrillas Xavier,
Pena Pilar,
De Aza Salvador
Publication year - 2008
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.1551-2916.2008.02294.x
Subject(s) - phase diagram , phase (matter) , transformation (genetics) , magnesium , solid solution , sintering , mineralogy , binary system , thermodynamics , binary number , materials science , chemistry , chemical engineering , metallurgy , physics , mathematics , organic chemistry , arithmetic , biochemistry , gene , engineering
The transformation β→α in Mg‐substituted Ca 3 (PO 4 ) 2 was studied. The results obtained showed that, contrary to common belief, there is, in the system Mg 3 (PO 4 ) 2 –Ca 3 (PO 4 ) 2 , a binary phase field where β+α‐Ca 3 (PO 4 ) 2 solid solutions coexist. This binary field lies between the single‐phase fields of β‐ and α‐Ca 3 (PO 4 ) 2 solid solution in the Ca 3 (PO 4 ) 2 ‐rich zone of the mentioned system. In the light of the results and the Palatnik–Landau's Contact Rule of Phase Regions, a corrected phase equilibrium diagram has been proposed. The practical implications of these findings with regard to the synthesis of pure α‐ and β‐ Mg‐substituted Ca 3 (PO 4 ) 2 powders and to the sintering of related bioceramics with improved mechanical properties are pointed out.