Transactions of the Materials Research Society of Japan
Online ISSN : 2188-1650
Print ISSN : 1382-3469
ISSN-L : 1382-3469
Regular Papers
Morphology and Composition of Hydroxyapatite Particles Synthesized Hydrothermally from Tricalcium Phosphates
Masanobu KamitakaharaYuki EnariNoriaki WatanabeKoji Ioku
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2011 Volume 36 Issue 3 Pages 405-408

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Abstract
Hydroxyapatite (HA) ceramics are used as artificial bones and adsorbents. The properties of HA particles are dependent on their morphology and composition. To reveal the effects of these factors, tailored HA particles are required. In the present study, HA particles with a controlled morphology and composition were prepared using the hydrothermal treatment of α- or β-tricalcium phosphate (α- or β-TCP) particles in an acidic or basic solutions at 120−240 °C. Plate-like HA particles were obtained when α-TCP was treated with the acidic solution. Rod-like HA particles were obtained when α-TCP was treated with the basic solution or when β-TCP was treated with the acidic solution. Rice-like HA particles were obtained when β-TCP was treated with the basic solution. The HA particles that were obtained under these conditions had a calcium-deficient composition, and the Ca/P molar ratio approached the stoichiometric value when the treatment temperature was increased. The morphology and composition of HA particles were controlled by selecting the starting materials and hydrothermal conditions.
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© 2011 The Materials Research Society of Japan
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