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    A Calibrated Method for Crystallinity Determination of Hydroxylapatite Coatings

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    A quick and inexpensive method was developed to determine the crystallinity of hydroxylapatite coatings using X-ray diffraction for the purpose of production control.

    Crystalline hydroxylapatite powder, when sprayed onto a substrate with thermal spraying, forms a mostly two phase material consisting of crystalline hydroxylapatite and amorphous material and very likely some trace impurities. The term crystallinity of a thermal sprayed hydroxylapatite coating is defined as the weight percentage of crystalline hydroxylapatite material to the total amount of material in the coating. With X-ray diffraction of the coating, the integrated crystalline hydroxylapatite peak intensity between 25° and 40° (2⊖) is measured and divided by the same integrated intensity of a 100% crystalline hydroxylapatite standard. The ratio between both is called the crystallinity of the hydroxylapatite coating. The method is calibrated using crystallinity standards which have been made by mixing 100% crystalline hydroxylapatite powder with 100% amorphous powder in different ratios.


    crystallinity, hydroxylapatite, coatings, plasma spraying

    Author Information:

    Flach, JS
    Research Scientist, CAM Implants B.V., Leiden,

    Shimp, LA
    President, CAM Implants Inc., Arvada, Colorado

    van Blitterswijk, CA
    Associate Professor, Laboratory Otobiology and Biocompatibility, Biomaterials Research Group, Leiden,

    de Groot, K
    Professor, Biomaterials Research Group, Leiden,

    Committee/Subcommittee: F04.13

    DOI: 10.1520/STP25180S