TY - JOUR
T1 - In situ observation of defects in hydroxyapatite up to 1200 ° C by ultraviolet Raman spectroscopy
AU - Fujimori, Hirotaka
AU - Toya, Hiroyuki
AU - Ioku, Koji
AU - Goto, Seishi
AU - Yoshimura, Masahiro
N1 - Funding Information:
The authors are thankful to Profs. M. Kakihana and M. Yashima for their help on the UV Raman system for high temperature materials. The present work has been supported partly by cooperative programs in the Materials and Structures Laboratory of Tokyo Institute of Technology.
PY - 2000/7/28
Y1 - 2000/7/28
N2 - Raman spectra of hydroxyapatite have been successfully obtained at temperatures up to 1200°C for the first time by using a new system of ultraviolet (UV) Raman spectroscopy. With increasing temperature, the intensity of a band ascribed to the stretching vibration of the OH ion continuously decreased. The total intensity of bands in the wavenumber range of 3300-3800 cm-1 did not change significantly up to about 800°C, whereas they decreased at temperatures higher than about 800°C. This result is interpreted as producing oxy-hydroxyapatite due to dehydration of hydroxyapatite over 800°C. The withdrawal of water is accompanied by the creation of defects. This consideration is strongly supported by results of thermodynamic calculations and the line width of the Raman band.
AB - Raman spectra of hydroxyapatite have been successfully obtained at temperatures up to 1200°C for the first time by using a new system of ultraviolet (UV) Raman spectroscopy. With increasing temperature, the intensity of a band ascribed to the stretching vibration of the OH ion continuously decreased. The total intensity of bands in the wavenumber range of 3300-3800 cm-1 did not change significantly up to about 800°C, whereas they decreased at temperatures higher than about 800°C. This result is interpreted as producing oxy-hydroxyapatite due to dehydration of hydroxyapatite over 800°C. The withdrawal of water is accompanied by the creation of defects. This consideration is strongly supported by results of thermodynamic calculations and the line width of the Raman band.
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U2 - 10.1016/S0009-2614(00)00695-3
DO - 10.1016/S0009-2614(00)00695-3
M3 - Article
AN - SCOPUS:0010617695
SN - 0009-2614
VL - 325
SP - 383
EP - 388
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 4
ER -