Biphasic Calcium Phosphate: Preferential Ionic Substitutions and Crystallographic Relationships at Grain Boundaries

Abstract:

Solid-state transformation of CDA at high temperature has been investigated using TEM microscopy and diffraction from sintered biphasic calcium phosphate (hydroxyapatite-HA, and beta-tricalcium phosphate-TCP). Microcrystals, between 200nm and 800nm approximately, separated by grain boundaries were found to be either HA-HA or TCP-TCP, but not HA-TCP, suggesting that heteroepitaxial growth is very unlikely between these two orthophosphates. TEM-correlated EDX elemental analysis also demonstrated a higher ionic substitution (Na, Mg) of TCP phase.

• Periodical: Key Engineering Materials (Volume 631)
• Pages: 73-77
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.631.73
• Online since: November 2014
• Authors: T. Miramond*, T. Rouillon, Guy Daculsi
• Keywords: Biphasic Calcium Phosphate, Grain Boundary, Solid Solution

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