Cation-Exchange Characteristics of Sintered Hydroxyapatite in the Strongly Acidic Region |
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| Authors: | Suguru Suzuki Toshifumi Fuzita Toru Maruyama Minoru Takahashi Yasuo Hikichi |
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| Affiliation: | Ceramics Research Laboratory, Nagoya Institute of Technology, Asahigaoka, 10–6–29, Tajimi 507, Japan;Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso, Nagoya 466, Japan |
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| Abstract: | The ion-exchange behavior of hydroxyapatite (Ca10(PO4)6-OH)2) (HAp), fired at high temperatures, has been investigated in the strongly acidic region (pH 2 and 3). According to the present study, HAp fired above 1000°C can exchange ions from Ca2+ to Pb2+, even at pH 2, without dissolution. The molar ratios of Pb2+/Ca2+ after ion exchange are approximately unity in all cases. Ion exchange occurs in a thin layer near the surface of HAp particles fired at 1300°C. After ion exchange, Pb-Cl-apatite crystals are created in the strongly acidic region (pH 2). |
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