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Determination of Calcium/Phosphorus Atomic Ratio of Calcium Phosphate Apatites Using X‐ray Diffractometry
Author(s) -
Raynaud Sylvie,
Champion Eric,
BernacheAssollant Didier,
Laval JeanPaul
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00663.x
Subject(s) - calcium , phosphorus , chemistry , x ray , analytical chemistry (journal) , phosphate , chemical composition , atomic number , mineralogy , chromatography , biochemistry , physics , organic chemistry , atomic physics , quantum mechanics
The properties of calcium phosphates of biological interest depend strongly on their calcium/phosphorus atomic ratios (Ca/P). Therefore, the precision for the determination of this ratio is crucial. We have investigated the accuracy of quantitative X‐ray diffractometry (QXRD) analysis for the determination of Ca/P in compounds with Ca/P ranging from 1.5 to 2. For 1.5 < Ca/P < 1.667, a high accuracy is obtained with relative uncertainties on Ca/P values between 0.1% and 0.4%. In this domain of composition, QXRD is more accurate than classical wet methods. For 1.667 < Ca/P < 2, the precision is lower and wet chemical methods appear to be superior.