MMR Technologies, Inc.

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Variable Temperature Seebeck Effect

The Seebeck effect is a phenomenon in which a temperature difference between two dissimilar electrical conductors or semiconductors produces a voltage difference between the two substances.

The voltages produced by Seebeck effect are small, usually only a few microvolts (millionths of a volt) per kelvin of temperature difference at the junction. If the temperature difference is large enough, some Seebeck-effect devices can produce a few millivolts (thousandths of a volt).

Seebeck-Schematic

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Numerous such devices can be connected in series to increase the output voltage or in parallel to increase the maximum deliverable current. Large arrays of Seebeck-effect devices can provide useful, small-scale electrical power if a large temperature difference is maintained across the junctions.

Features and Benefits

In addition to all the advantages inherent in the usage of Joule Thomson Thermal Stages as the source of temperature control in these setups, the MMR Technologies Seebeck Measurement System offers many advantages in scientific applications:

  • 50 nVolt resolution in Seebeck Measurements
  • Ease of measurement of samples ranging from metals to thin films.
  • Highly accurate and highly reproducible results.
  • Automatic operation in a single step against an internal reference material.
  • Small, compact size.
  • Wide range of operation: 70K to 730K
  • A wide range of sample types can be measured including single crystals, thin films, wires, etc.

Automation of the thermopower measurements provides the following advantages:

  • Continuous computer-controlled tuning of the experimental parameters can produce a temperature gradient with nearly constant
  • magnitude and period.
  • An order of magnitude increase in the density of collected data is readily achieved
  • A consistent data reduction process is used for each set of measurements obtained

Overall, these factors allow the MMR Technologies’ Seebeck Effect Measurement system be incredibly accurate with highly reproducible results.

Applications

Temperature dependent thermoelectric power (thermopower) measurements on electrically conductive specimens can provide information about the sign of the majority carrier, the mechanism of charge conduction, and in conjunction with appropriate theoretical models, information on the band structure of the material under investigation. Thermopower measurements are also an effective way of determining the intrinsic properties of samples having an electrical conductivity that is dominated by an extrinsic defect structure. A high sensitivity to structural change makes thermopower measurements an excellent technique for the study of structural phase conditions on the charge transport properties of a given material.

Research into thermoelectric materials is important in the fields of energy conservation and alternative energy sources. Developing better materials is of extreme importance in the industries of:

  • Automobiles and Fuel Consumption
  • Energy Efficiency
  • Alternate Energy Sources
  • Thermoelectric refrigeration
  • And many other industries and research areas - new ones every year.

These systems share many components with the Hall Effect Measurement systems - and can be sold as stand alone systems or as an upgrade.

What’s new

  • Introducing the new digital controllers: K2000 and SB1000!

    Products | 22 Nov 2013

    MMR Technologies is proud to introduce two all-new digital controller systems  for use with the turnkey Seebeck Effect Measurement Systems,  Variable Temperature  Microprobe Systems and options for Optical and Microscope Temperature Control  Systems.**

  • Visit MMR Technologies at MRS Fall 2013

    News | 18 Nov 2013

    Come and see MMR Technologies' products - booth 1001 - at the 2013 MRS Fall Meeting & Exhibit, December 1 - 6 at the Hynes Convention Center in Boston, MA!

  • Joule-Thomson Temperature Stages

    Products | 8 May 2013

    When a non-ideal gas expands from a high pressure to a low pressure, there is a temperature change even though no other work is being done by the gas. This is the Joule-Thomson expansion of gas.

  • Model K20XR-x

    Products | 8 May 2013

    The Model K20XR-x (x = 0, 2, 3, 4, 5, 6) is a compact x-ray diffractometer thermal stage designedfor variable temperature studies of solid and powder samples in a variety of x-ray diffractometersystems.

  • Bio 085 Closed-Cycle Kleemenko

    Products | 8 May 2013

    The Bio 085 Closed-Cycle Kleemenko Cooler is a low cost, zero maintenance, benchtop cryogenic refrigerator system designed for the storage of frozen tissue, cell cultures, organs and body parts.

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