Combined LSR/LFA


On point

The Linseis LZT Meter represents a groundbreaking instrument, being the first commercially available device capable of determining the thermoelectric Figure of Merit ZT through a combined LaserFlash (LFA 1000) and LSR measurement, all within a single integrated system.

With this innovative system, researchers can independently measure the thermal conductivity using the flash method, along with conducting measurements of electrical resistance and the Seebeck coefficient, as known from the LSR platform. This integration offers clear advantages, including space and cost savings, making it an ideal solution for research and development applications prioritizing measurement quality and cost-efficiency. For a comprehensive ZT characterization of a sample, the unit’s single, disk-shaped geometry is entirely sufficient.

Key Benefits of the Combined Measurement:

  1. Single-sample measurement
  2. Eliminates geometry-related errors
  3. Maintains consistent stoichiometry
  4. No complications with additional sample preparation
  5. Ensures identical environmental conditions, including temperature, humidity, and atmospheric conditions
  6. Incorporates all well-known advantages of the LSR Platform
  7. Enables resistivity measurements of high-resistance samples
  8. Optional Harman measurement
  9. Camera option

The LZT Meter is available with three different furnace options:

  1. Infrared furnace for precise temperature control at various heating rates, both high and low.
  2. Low-temperature furnace, suitable for measurements as low as -100°C.
  3. High-temperature furnace, accommodating measurements at temperatures up to 1100°C.

Additionally, the supplied software package facilitates the user-friendly evaluation of measurement data and includes the option to utilize the integrated Harman ZT model. This comprehensive and versatile system simplifies the thermoelectric Figure of Merit ZT determination, making it a valuable tool for research and development endeavors.

Principles of measurement

The Linseis LZT enables thermoelectric measurements using the same well-established techniques and features as our trusted LSR-3 platform. Additional detailed information can be accessed here. It’s important to note that, apart from the square-shaped sample geometry shown, all measurements can also be conducted using a disc-shaped sample, offering flexibility in experimental setups.

Seebeck coefficent measurement with LZT meter
Resisitivity measurement with LZT meter
Harman method with LZT meter

Available accessories

Sample holder for disk shaped (standard) and rectangular/cylindrical samples

Sample holder for disk shaped (standard) and rectangular/cylindrical samples

While the integrated Laser is essential for thermal diffusivity measurements, which require a disc-shaped sample holder (available in 10 mm, 12.7 mm, or 25.4 mm diameters), the LZT-Meter offers versatility. It can also perform measurements of the Seebeck coefficient and resistivity using different sample geometries, such as cylindrical samples (up to ø 6 mm x 23 mm in height) or rod-shaped samples (with a footprint of up to 5 mm x 5 mm and 23 mm in height).

In the case of rod-shaped samples, it’s crucial that the sample’s footprint area is ideally smaller than or equal to the surface area of the electrodes. This ensures a one-dimensional flow of heat and electricity through the sample, maintaining measurement accuracy.

Thermoelements and Camera-Option

Standard thermocouple: for highest precision

Sheathed thermocouple: for challenging samples

Type K/S/C thermocouples: 

  • Type K for low temperature measurements
  • Type S for high temperature measurements
  • Type C for Pt-poisoning samples


  • Camera-option for probe distance measurements
  • Allows highest accuracy resistivity measurements
  • Software package included


Everything at a glance

The Linseis LZT Meter offers a comprehensive solution for complete ZT characterization, simplifying the process with a single integrated device.

Key Advantages:

  • Cost-effective and space-efficient, saving on both expenses and laboratory space.
  • The high-ohm option and variably positionable thermocouples ensure reliable resistivity measurements, even for the most challenging samples.
  • Interchangeable furnaces cover a wide temperature range, from -100°C to 1100°C, accommodating diverse experimental needs.
  • Direct ZT measurement on legs using the Harman method and on modules through impedance spectroscopy.
  • Thermal conductivity measurements facilitated by the LaserFlash method.
  • A high-speed infrared furnace option for precise temperature control during measurements and increased sample throughput.
  • A wide range of thermocouples available, catering to different temperature ranges and applications, including shrouded and freestanding designs.
  • An optional camera feature enhances the precision of resistivity measurements, contributing to the overall versatility of the system.
Model LSR-3 Part
Temperature range:  Infrared furnace: RT to 800°C/1100°C
Low temperature furnace: -100°C to 500°C
Measurement principle: Seebeck-Coeffizient: Static-DC method / Slope-method
Resistance measurement: Four-Terminal method
Atmospheres: Inert, reducing, oxidizing, vacuum
Low pressure helium gas recommended
Sample holder: Vertical positioning between two electrodes
Optional adapter for foils and thin films
Sample size (cylindrical oder rectangular): 2 to 5 mm footprint and max. 23 mm long
up to 6 mm in diameter and max. 23 mm long
Sample size round (disc shape): 10, 12.7, 25.4 mm
Probe distance: 4, 6, 8 mm
Water cooling: required
Measurement range Seebeck-Coefficient: 1µV/K to 250mV/K (static dc method)
Accuracy ±7% / Reproducibility ±3,5%
Measurement range Conductivity: 0.01 to 2×105 S/cm
Accuracy ±10% / Reproducibility ±5%
Current source: Low drift current source from 0 to 160 mA
Electrode material: Nickel (-100 up to 500°C) / Platinum (-100 up to +1500°C)
Thermocouples: Type K/S/C

* 5% for LSR incl. Camera-Option

Thermal Conductivity
Puls source: Nd:YAG Laser (25 Joule)
Puls duration: 0,01 up to 5ms
Detektor: InSb / MCT
Thermal Diffusivity
Measurement range: 0,01 up to 1000mm2/s
Addon LSR-4 Upgrade
DC Harman-method: Direct ZT-measurement on thermoelectric legs
AC Impedance-Spectroscopy: Direct ZT-measurement on thermoelectric modules (TEG/Peltier-module)
Temperature range: -100 up to +400°C
RT bis +400°C
Sample holder: Needle contacts for adiabatic measurement conditions
Sample size: 2 to 5 mm rectangular and max. 23 mm long
up to 6 mm in diameter and max. 23 mm long
Modules up to 50mm x 50mm

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Make values comparable and visible

The LINSEIS thermal analysis software, a robust Microsoft® Windows® based solution, plays a pivotal role in facilitating the preparation, execution, and evaluation of thermoanalytical experiments, working seamlessly with the hardware components.

This software package represents a comprehensive tool for programming device-specific settings, control functions, and data management, developed by LINSEIS’ in-house software specialists and application experts. It has undergone rigorous testing and continuous expansion over several years.

Key Features:

LFA Properties:

  1. Accurate pulse length correction, featuring “pulse mapping.”
  2. Heat loss correction mechanisms.
  3. Capability to analyze 2- or 3-layer systems.
  4. Measurement of contact resistance in multilayer systems.
  5. Model Wizard for selecting the optimal evaluation model.
  6. Determination of specific heat capacity.

LSR Properties:

  1. Support for cylindrical, square-shaped, and disk-shaped samples.
  2. Availability of high- and low-temperature furnaces.
  3. Barrier-free programmability.
  4. Thin film adapter for flexible and stable thin film measurements.
  5. Integrated program wizard.
  6. Determination of the Seebeck effect, electrical conductivity, and Harman-ZT.

General Properties:

  1. Automatic evaluation of the Seebeck coefficient and electrical conductivity.
  2. Automated control of sample contacting.
  3. Creation of automatic measurement programs.
  4. Generation of temperature profiles and gradients for the Seebeck measurement.
  5. Automatic evaluation of Harman measurements (optional).
  6. Real-time color rendering.
  7. Automatic and manual scaling options.
  8. Selectable representation of axes (e.g., temperature on the x-axis versus delta L on the y-axis).
  9. Mathematical calculations, including first and second derivatives.
  10. Database for archiving all measurements and evaluations.
  11. Multitasking, allowing simultaneous use of different programs.
  12. Multi-User Option with user accounts.
  13. Zoom options for curve cuts.
  14. Capacity to load and compare any number of curves.
  15. Online Help Menu.
  16. Free labeling of curves.
  17. Simplified export functions, including CTRL C.
  18. EXCEL® and ASCII export of measurement data.
  19. Capability to calculate zero curves.
  20. Statistical trend evaluation, with a mean value curve and confidence interval.
  21. Tabular presentation of data.


Application example for LSR-funtion: Tellurid

A common thermoelectric material belonging to the telluride family has been subjected to testing in a temperature range spanning from room temperature (RT) up to 200°C. The measurements include data on electric resistivity and the Seebeck coefficient at various temperatures.

Application example for LFA-function: Copper / Aluminum

In this example, we utilize pure metals, specifically Copper and Aluminum, to showcase the capabilities of the Linseis Laser Flash device. By comparing the measurement results of these two materials with values found in existing literature, we observe that the measured results closely align with the literature values, deviating by no more than 2%. This underscores the exceptional performance of the instrument.

Application example LFA-function: Pyroceram 9606

The Pyroceram 9606 serves as the standard reference material for Laser Flash testing. It is a military-grade transparent material commonly used as tops for hot plates and stirrers. Unlike metal surfaces, glass ceramic offers ease of cleaning, exceptional resistance to scratches, corrosion, and chemical exposure.

Application example LFA-function: Isotropic Graphite (AIST)

The graph illustrates Thermal Diffusivity values measured using the Linseis LFA 1000, and these values are compared to those obtained at AIST* in Japan. When we compare the measured results on the LFA 1000 with the literature values of the Isotropic Graphite sourced from AIST*, we find that the variation is less than 2%.

* AIST stands for the National Institute of Advanced Industrial Science and Technology in Japan.


LZT-Meter Product Brochure (PDF)

LSR, LZT, LFA, TF-LFA, TFA, Hall-Effect Product Brochure (PDF)

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