תיאור
A Measurement Setup for Varied Sample Geometries
The SBA 458 Nemesis® is heralded for its unique measurement setup, which accomodates more sample geometries than usually for this technique. Measurements can be carried out at temperatures up to 1100°C.
Quick Start to Measurements – Convenient Sample Change
Changing samples is accomplished quickly and easily by hand, without any tools. By using sheathed thermocouples sticking of the sample to the electrodes is avoided.
Integrated Quality Check – Outstanding Two-Heater System
The SBA 458 Nemesis® has two heavy systems that are employed in an alternating manner for each temperature step. Deviations from linearity and hysteresis due to inaccurate measurement can be immediately observed before and during the measurement.
Highly Reliable and Rugged Design – Avoiding Diffusion Problems
The thermocouples are firmly anchored and are immobilized during the measurements by a defined contact force resulting from the mass and the cold spring. Sheathing of the thermocouples prevents diffusion from cementing them to the sample.
No Distance Determination Required
Since the thermocouple positions are fixed, the cumbersome process of determining their distance before each measurement is eliminated. Eliminating this potential source of error in determining electrical conductivity increases the precision and reproducibility of the results.
Key Technical Data
(subject to change)
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Design
Two-heater system, integrated quality check, horizontal sample arrangement
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Temperature range
Room temperature to 800°C
Room temperature to 1100°C
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Temperature setting range
Unlimited number of temperature steps
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Thermocouples
Inconel®-sheathed type K (NiCr/NiAl), Fixed position
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Sample dimensions
- Ø: 12.7 to 25.4 mm
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Length x Width:
12.7… 25.4 mm x 2.0… 25.4 mm
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additionally:
Length x Width: 10 mm x 10 mm
- Thickness: 100 nm to 3 mm depending on the thermophysical properties
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Accuracy
- Seebeck coefficient ± 7%
- Electrical conductivity ± 5%
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Repeatability
- Seebeck coefficient ± 3%
- Electrical conductivity ± 3%
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Atmosphere
Reducing (max. 2% H2), inert, oxidizing
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Vacuum-tightness
10-2 mbar
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Seebeck coefficient range
10…2000 μV/K
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Electrical conductivity
0.05…150000 S/cm
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Quality check for Seebeck measurement
Yes (before and during the measurement)
