Biomedical Engineering Reference
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∇
Ti substrate
∇
∇
∇
* HA
∇
*
HASi100
*
**
*
**
*
*
******
HASi50
HA
20
30
40
50
θ
- 2
θ
(°)
Figure 11.20.
XRD pattern of different thin fi lms deposited by PLD in a water vapour atmo-
sphere. From [Solla, 2007].
TABLE 11.3. Quantifi ed XPS Results for the Different S i - HA Coatings Obtained by PLD in a
Water Vapour Atmosphere
Composition (at. %)
Binding energy (eV ± 0.2 eV)
Sample
Si
Ca
P
Ca/(P
+
Si)
Si
2p
Ca
2p
P
2p
HA
—
26.0
12.5
2.08
—
347.3
133.3
HASi25
1.6
25.8
11.2
2.01
100.9
347.3
133.2
HASi50
2.6
23.8
12.2
1.61
101.7
347.2
133.1
HASi75
2.8
24.7
12.3
1.63
101.4
347.5
133.5
3.4
20.7
9.8
1.57
101.5
347.4
133.3
HASi100
From [Solla, 2007 ].
increases as well, on the other hand, the quantities of Ca and P remain almost
constant within the error range, the exception being a small decrease in the
HASi100 sample.
Considering their binding energy, the energies of the Si
2p
, Ca
2p
, P
2p
and O
1s
peaks are all constant within the error range. The P
2p
peak is centered at
133,3
0.2 eV, the binding ener-
gies that can be assigned to apatite groups. The Si
2p
energies around 101.6
±
0.2 eV, and the O
1s
is at 531.1
±
0.2 eV and 532.7
±
±
0.2 eV
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