Journal of Nanomaterials / 2014 / Article / Tab 1

Research Article

Synthesis and Mechanism of Tetracalcium Phosphate from Nanocrystalline Precursor

Table 1

Vibrational wave numbers [cm−1] of samples.

Raman
= 514.5 nm
FT-IR
KBr
Assignments

1400~1500°C  
×8 h
327Lattice modes
390, 408, 448, 481454, 470, 501, bands in TTCP, symmetric bending vibrations mode
555, 565, 577, 598, 608, 616570, 593, 621ν 4, bands in TTCP, asymmetric bending vibrations mode
941, 948, 957, 963 938, 958ν 1, bands in TTCP, symmetric stretching mode
992, 1010, 1027, 1046,
1075, 1095, 1122, 1135
985, 1009, 1031, 1045, 1063, 1074, 1094, 1105ν 3, bands in TTCP, asymmetric stretching mode

850–1150°C  
×8 h
430, 445431, 471ν 2, bands in HA
579, 590, 607604ν 4, bands in HA
634Vibrational mode of OH
871Out-of-plane bending vibrations of
961961ν 1, bands in HA
1028, 1046, 1075, 11231025, 1091ν 3, bands in HA
1085Symmetric stretching of
1412, 1452, 1467Asymmetric stretching of
35723572OH stretching vibration (in HA)
36193643OH stretching vibration (in Ca(OH)2)

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