TY - JOUR
T1 - Chemical and crystallographic characterizations of hydroxyapatite-and octacalcium phosphate-coatings on magnesium synthesized by chemical solution deposition using XPS and XRD
AU - Ohtsu, Naofumi
AU - Hiromoto, Sachiko
AU - Yamane, Misao
AU - Satoh, Kozue
AU - Tomozawa, Masanari
N1 - Funding Information:
The authors acknowledge Prof. J. Shibano from Kitami Institute of Technology for critically reviewing the manuscript. This work was partially supported by a Grant-in-Aid for Young Scientist (B)( 22760568 ) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan and by a grant from the Light Metal Educational Foundation, Japan .
PY - 2013
Y1 - 2013
N2 - Hydroxyapatite (HAp) and octacalcium phosphate (OCP) coatings deposited on a pure magnesium (Mg) substrate from an aqueous solution containing C10H12N2O8Na2Ca (Ca-EDTA) and KH2PO4 were precisely analyzed using X-ray photoelectron spectroscopy (XPS) and high-resolution X-ray diffractometry (XRD) to clarify their chemical and crystallographic characteristics. The calcium phosphate coatings comprised single-phase HAp or OCP containing small amounts of sodium (Na). The intermediate layer formed underneath the coatings consisted of Mg(OH)2 mixed with calcium phosphate. The atomic ratios of calcium to phosphorus ([Ca]/[P]) in the HAp and OCP coatings were notably smaller than those of stoichiometric compounds. The expansion along the a-axis compared to that of stoichiometric HApwas observed in XRD results. Also, we did not detect Na compounds in the coating. Therefore, it is presumed that Na existed as a substitute of Ca in the OCP and HAp structures.
AB - Hydroxyapatite (HAp) and octacalcium phosphate (OCP) coatings deposited on a pure magnesium (Mg) substrate from an aqueous solution containing C10H12N2O8Na2Ca (Ca-EDTA) and KH2PO4 were precisely analyzed using X-ray photoelectron spectroscopy (XPS) and high-resolution X-ray diffractometry (XRD) to clarify their chemical and crystallographic characteristics. The calcium phosphate coatings comprised single-phase HAp or OCP containing small amounts of sodium (Na). The intermediate layer formed underneath the coatings consisted of Mg(OH)2 mixed with calcium phosphate. The atomic ratios of calcium to phosphorus ([Ca]/[P]) in the HAp and OCP coatings were notably smaller than those of stoichiometric compounds. The expansion along the a-axis compared to that of stoichiometric HApwas observed in XRD results. Also, we did not detect Na compounds in the coating. Therefore, it is presumed that Na existed as a substitute of Ca in the OCP and HAp structures.
KW - Calcium phosphate coatings
KW - Chemical solution deposition
KW - Magnesium
KW - XPS
KW - XRD
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U2 - 10.1016/j.surfcoat.2012.12.037
DO - 10.1016/j.surfcoat.2012.12.037
M3 - Article
AN - SCOPUS:84878834594
SN - 0257-8972
VL - 218
SP - 114
EP - 118
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
IS - 1
ER -