Physicochemical studies on solid solutions of calcium phosphorus arsenic hydroxyapatites.
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概要
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Samples of arsenic hydroxyapatite and its solid solutions with calcium hydroxyapatite are synthesized in aqueous media. The samples are characterized by X-ray, infrared spectra, the assignments of phosphate, arsenate, and hydroxyl bands are recorded. The possibility of anion migration in the apatite lattice is proposed. Presence of water, adsorbed in nature, is indicated in the TGA and DTA analysis of the samples. The solubility product, <I>K</I><SUB>sp</SUB>, of the samples of arsenic hydroxyapatite Ca<SUB>10</SUB>(AsO<SUB>4</SUB>)<SUB>6</SUB>(OH)<SUB>2</SUB>, and the solid solutions, Ca<SUB>10</SUB>(PO<SUB>4</SUB>)<SUB>6−<I>x</I></SUB>(AsO<SUB>4</SUB>)<I><SUB>x</SUB></I>(OH)<SUB>2</SUB>, (<I>x</I>=1 to 5) are determined considering the formation of ion pairs [CaHAsO<SUB>4</SUB>]<SUP>0</SUP>, [CaHPO<SUB>4</SUB>]<SUP>0</SUP>, [Ca(H<SUB>2</SUB>AsO<SUB>4</SUB>)]<SUP>+</SUP>, and [Ca(H<SUB>2</SUB>PO<SUB>4</SUB>)]<SUP>+</SUP> in solution. The instability of the samples in solution is indicated from the experimental Δ<I>G</I><SUP>0</SUP><SUB>soln.</SUB> values.
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著者
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Mahapatra L.
Post-Graduate Department of Chemistry, Khallikote College
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Mahapatra P.
Post-Graduate Department of Chemistry, Khallikote College
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Mishra Bagmi
Post-Graduate Department of Chemistry, Khallikote College