7-2
IRAffinity-1
Chapter 7 Materials for Infrared Analysis
Listed materials are used in IRAffinity-1 and their accessories. Used materials are depended on the equipment.
They are usually used as windows or ATR prisms. Selection of materials are based on wavenumber range and
physical/chemical characteristics of samples.
This section describes typical characteristics of some materials.
Some of the materials are used only rarely due to the difficulty of processing and high-cost.
Table 7.1 List of Typical Materials for Infrared Analysis
%Transmission value given are typical ones, in the wavenumber range applicable to the respective materials,
including the loss due to surface reflection.
Material
Wavenumber
range
cm
−1
(μm)
Refractive
index
1000 cm
−1
Water
solubility
at 20 °C
g/100 gH
2
O
%
transmission
(thickness)
Max. Temp.
(Melting point)
Knoop
hardness
KBr
40000~340
(0.25~29.4)
1.52 65
90
(5 mm)
300
(730)
7.0
(100 g)
NaCl
50000~600
(0.2~16.6)
1.49 36
90
(5 mm)
400
(801)
18.2
(100 g)
KCl
40000~500
(0.25~20.0)
1.46 34
90
(10 mm)
(776)
9.3
(100 g)
CsI
33000~200
(0.3~50.0)
1.74 44
90
(5 mm)
200
(621)
−
KRS-5
(TlBr+TlI)
16600~250
(0.6~40.0)
2.37 0.05
70
(2 mm)
200
(414)
40.2
ZnS
10000~725
(1.0~13.3)
2.2 Insoluble
70
(1 mm)
300
(1180
sublimate)
354
ZnSe
10000~550
(1.0~18.1)
2.4 Insoluble
65
(1 mm)
350
(1700)
250
BaF
2
50000~770
(0.2~12.9)
1.42 0.004
90
(1 mm)
500
(1280)
82
(500 g)
CaF
2
50000~1100
(0.2~9.0)
1.39 Insoluble
95
(3.6 mm)
900
(1402)
158
(500 g)
Si
8000~660
(1.25~15.1)
3.4 Insoluble
55
(2.5 mm)
300
(1420)
1150
Ge
5500~660
(1.8~16.6)
4 Insoluble
50
(2 mm)
270
(936)
24
Diamond
Type II
40000~12.5
(0.25~800)
2.38 Insoluble
70
(1 mm)
(400)
10 Mohs
scale
SiO
2
(Fused Silica)
50000~2500
(0.20~4.0)
1. 42
(3000 cm
−1
)
Insoluble
85
(1 mm)
1170 softens 500
7.1 Materials for Infrared Analysis
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