Preparation of hydroxyapatite and calcium phosphate films by MOCVD

Abstract

Ca-P-O films were prepared by MOCVD using Ca(dpm)2 and (C 6H5O)3PO precursors. The crystal phase changed with changing deposition conditions of substrate temperature (Tsub), total pressure (Ptot) and molar ratio of Ca and P precursors (R Ca/P). α-tricalcium phosphate (γ-Ca3(PO 4)2) in a single phase was obtained at Ysub = 973K, RCa/P < 0.3 and Tsub = 1073K, RCa/P = 0.1 to 0.5. Hydroxyapatite (Ca10(PO4)6(OH) 2) in a single phase was first prepared by MOCVD at Tsub = 973 K, RCa/P = 0.5 and Tsub = 1073 K, RCa/P = 0.8 to 1. The maximum deposition rate of α-TCP and HAp films in a single phase were 6.0 and 4.0nms-1 at Pwt = 0.8 kPa and T sub = 1073 K, respectively. © 2007 The Japan Institute of Metals.