Shimadzu IRAffinity-1, Instruction Manual

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7-4
IRAffinity-1
Chapter 7 Materials for Infrared Analysis
Material Characteristics Clean-Up Harm
ZnSe
Zinc selenide Insoluble in water.
Resistant against weak acidic or alkaline
solution.
Applicable pH range: 5 to 9.
High refractive index.
Used for ATR prism.
Highly toxic H
2
Se gas may be generated if
acidic samples are run with ZnSe prisms or
windows.
acetone
water strong acidic or
alkaline solution
BaF
2
Barium fluoride
Soluble in ammonium salt solution.
Usable up to 500
° C.
Almost insoluble in water.
acetone
water acidic solution
ammonium salt
solution
CaF
2
Calcium fluoride
Soluble in ammonium salt solution.
Resistant against acidic or alkaline solution.
Hard, high mechanical strength.
Suitable for high-pressure cell
Si
Silicon Widely used as the material for
semiconductors.
Rarely used as window material.
Ge can substitute Si as window material. acetone
water HF+HNO
3
Ge
Germanium Widely used as the material for
semiconductors.
Easily processed to be lenses.
High refractive index, suitable as the
material for as ATR prism used in analysis
of high refractive samples.
Insoluble in water. toluene
water Hot sulfuric acid
Diamond Type II Harder than any other materials.
Applicable to wavelength range from UV to
far-IR, though a gradual absorption is seen
in the range from 30000 to 1500 cm
− 1
.
Natural diamond is classified as Type I and
Type II, and only Type II is used for IR
analysis.
Extremely expensive.
Recommended for the window of high-
pressure cell.
ethanol
acetone
SiO
2
(Fused Silica) Effective for analysis in the UV and visible
regions.
Though useful up to 4 nm in the IR region,
this is material ensures high stability and is
easy to process. ethanol
acetone