Thermal Diffusivity & Conductivity

SBA 458 Nemesis

Simultaneous Determination of Seebeck Coefficient and Electrical Conductivity 

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.

Technical Data

Temperature range
RT to 1100°C
-125°C to 500°C
Two-heater system, integrated quality check, horizontal sample arrangement
Temperature setting range
Unlimited number of temperature steps

Inconel®-sheathed type K (NiCr/NiAl), Fixed position

Sample dimensions
Ø: 12.7 to 25.4 mm
Length x Width:
12.7... 25.4 mm x 2.0... 25.4 mm
Length x Width: 10 mm x 10 mm
Thickness: 100 nm to 3 mm depending on the thermophysical properties

Seebeck coefficient ± 7%
Electrical conductivity ± 5%

Seebeck coefficient ± 3%
Electrical conductivity ± 3%

Reducing (max. 2% H2), inert, oxidizing

10-2 mbar

Seebeck coefficient range
10...2000 μV/K

Electrical conductivity
0.05...150000 S/cm

Quality check for Seebeck measurement
Yes (before and during the measurement)


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