Journal of Nanomaterials / 2014 / Article / Tab 2

Research Article

Synthesis and Mechanism of Tetracalcium Phosphate from Nanocrystalline Precursor

Table 2

Raman shift [cm−1] of the calcinations samples by different cooling methods.

1400~1500°C  
×8 h, air quenching
1400~1500°C  
×8 h, furnace cooling
Assignments

Raman = 514.5 nm327Lattice modes (TTCP)
390, 408, 448, 481427, 444ν 2, bands, symmetric bending vibrations mode
555, 565, 577, 598, 608, 616575, 588, 605ν 4, bands, asymmetric bending vibrations mode
941, 948, 957, 963959ν 1, bands, symmetric stretching mode
992, 1010, 1027, 1046, 1075, 1095, 1122, 11351026, 1040, 1072, 1121ν 3, bands, asymmetric stretching mode
3573OH stretching vibration (in HA)
3619OH stretching vibration (in Ca(OH)2)

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