When determining the appropriate pressure for KBr pellets, several factors must be taken into account.
The pressure required for forming KBr pellets typically ranges from 8 tons to 10 tons.
This ensures that the pellets are firm, transparent, and suitable for spectroscopic analysis such as FT-IR.
The pressure is derived from the mechanical advantage provided by the KBr Pellet Press.
This press converts hand pressure on a lever into a significantly higher compressive force on the press ram.
4 Key Factors to Consider for KBr Pellet Pressure
1. KBr Pellet Press Mechanism
The KBr Pellet Press uses a lever and a large steel cam to develop compressive force.
A hand pressure of 20 pounds on the lever can develop approximately 1000 pounds of force on the press ram.
This is thanks to a mechanical advantage ratio of about 50 to 1.
2. Typical Pressure for KBr Pellets
The standard pressure for forming KBr pellets is between 8 tons to 10 tons.
This pressure is sufficient to produce firm and transparent pellets suitable for FT-IR spectroscopy.
3. Application in FT-IR and XRF Analysis
For FT-IR analysis, a load of 10 tonnes applied through a 13 mm diameter pellet die is commonly used.
For XRF analysis, larger pellet diameters (32 mm or 40 mm) are preferred to accommodate the X-ray beam.
4. Sample/KBr Ratio and Pellet Thickness
The concentration of the sample in KBr should be between 0.2 to 1 percent.
A lower concentration is required due to the thicker nature of the pellet compared to a liquid film.
5. Plasticity of Alkali Halides
Alkali halides like KBr become plastic under pressure, allowing them to form transparent sheets suitable for infrared spectroscopy.
This property is exploited in the KBr pellet method for preparing samples for spectroscopic analysis.
By understanding these key points, a lab equipment purchaser can ensure that the appropriate pressure is applied when using a KBr Pellet Press.
This results in high-quality pellets suitable for various spectroscopic analyses.
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