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Determination of the Ca/P ratio in calcium-deficient hydroxyapatite using X-ray diffraction analysis (1993)

Ishikawa, K. ; Ducheyne, P. ; Radin, S.

Springer

Journal of materials science 4 (1993), S. 165-168

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ISSN: 1573-4838

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine , Technology

Notes: The determination of the calcium to phosphate ratio (Ca/P) in Ca-deficient hydroxyapatite [d-HAP; Ca10−x (HPO4) x (PO4)6−x (OH)2−x ] using X-ray diffraction analysis (XRD) is reported. At temperatures above 700°C HPO4 2- groups are transformed to PO4 3- groups, thereby producing β-tricalcium phosphate [β-TCP; Ca3(PO4)2]. Thus, the deviation from stoichiometry, x, can be calculated from the mass fraction of β-TCP, which in turn can be determined from quantitative XRD analyses. In this study d-HAP powders with various Ca/P ratios were prepared following several procedures. It is shown that the Ca/P ratio determined by quantitative XRD correlates well with that measured by chemical analyses.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00120386

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