TY - JOUR
T1 - Polarized Raman scattering and low frequency infrared study of hydroxyapatite
AU - Iqbal, Zafar
AU - Tomaselli, V. P.
AU - Fahrenfeld, O.
AU - Möller, K. D.
AU - Ruszala, F. A.
AU - Kostiner, E.
PY - 1977/1/1
Y1 - 1977/1/1
N2 - A detailed investigation of the polarized Raman spectrum of monoclinic hydroxyapatite (OHAp) and a careful study of the low frequency infrared spectrum of polycrystalline OHAp, is reported. Most of the spectral details of Raman scattering are consistent with the local pseudo-hexagonal C6 factor group symmetry of OHAp. However, some features, for example the absence of TO-LO splitting for particular E1 phonon geometries and the splitting of the lowest frequency Raman line, are a reflection of the centrosymmetric monoclinic lattice of OHAp. Between 0 and 50cm-1, a temperature-dependent background, having E1 symmetry, and probably associated with OH- disordering flucuations, was observed in OHAp. Both OHAp and FAp displayed low frequency Raman lines which softened with decreasing temperature. However, no evidence for a phase transition was found in either OHAp or FAp in the 12-295 K temperature range.
AB - A detailed investigation of the polarized Raman spectrum of monoclinic hydroxyapatite (OHAp) and a careful study of the low frequency infrared spectrum of polycrystalline OHAp, is reported. Most of the spectral details of Raman scattering are consistent with the local pseudo-hexagonal C6 factor group symmetry of OHAp. However, some features, for example the absence of TO-LO splitting for particular E1 phonon geometries and the splitting of the lowest frequency Raman line, are a reflection of the centrosymmetric monoclinic lattice of OHAp. Between 0 and 50cm-1, a temperature-dependent background, having E1 symmetry, and probably associated with OH- disordering flucuations, was observed in OHAp. Both OHAp and FAp displayed low frequency Raman lines which softened with decreasing temperature. However, no evidence for a phase transition was found in either OHAp or FAp in the 12-295 K temperature range.
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U2 - 10.1016/0022-3697(77)90132-9
DO - 10.1016/0022-3697(77)90132-9
M3 - Article
AN - SCOPUS:0001382656
SN - 0022-3697
VL - 38
SP - 923
EP - 927
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
IS - 8
ER -