MEDICAL DEVICES BASED ON BIOINSPIRED CERAMICS - Advanced Biomaterials: Fundamentals, Processing, and Applications - page 387

TABLE 11.4. Composition of Bioactive Glasses (wt%)

N a 2 O
(wt%)

K 2 O
(wt%)

CaO
(wt%)

P 2 O 5
(wt%)

MgO
(wt%)

B 2 O 3
(wt%)

SiO 2
(wt%)

BG42 20 10 20 3 5 — 42

BG50 15 15 15 — 2 3 50

BG55 21 9 8 4 2 1 55

BG59 1 0 5 1 5 3 5 3 5 9

From [Liste, 2004b ].

Si-O-NBO

0.18

0.15

SiO (b)

ii)

0.12

SiO (s)

0.09

0.06

i)

0.03

0.00

1600 1400 1200 1000 800 600 400

Wavenumbers (cm -1 )

Figure 11.21. Typical FTIR spectra of i) bulk glass (BG50) used as ablation target and ii) the
corresponding PLD coating. From [Liste, 2004b].

2. a weak band at around 750 cm − 1 associated to the Si-O-Si bending vibra-
tion, and
3. an additional band at 900 - 950 cm − 1 , corresponding to the non-bridging
silicon - oxygen groups (Si - O - NBO).

Two important variations in the IR bands can be remarked:

1. the peak associated to the Si - O - Si stretching vibration shifts to lower
wavenumbers and its intensity increases, and
2. the band intensity assigned to the Si - O - NBO groups decreases.