LZT
9Pages

Catalog excerpts

Thermoelectricity describes the reciprocal interaction of temperature and electricity and their conversion into one another. There are three different effects—the Seebeck-Effect (Thermoelectric-Effect), the The Peltier-Effect is the inverted effect of the Seebeck-Effect. An exte- Peltier-Effect and the Thomson-Effect, which describe a reversible in- rior current produces a change of heat transport. This discovery was teraction between the both values. Nearly always these effects appear made 13 years after the Seebeck-Effect from Jean Peltier (1834). This effect appears, if two conductors...

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In recent years, thermoelectricity has been increasingly used in ap- Altenkirch (1909, 1911) showed that good thermoelectric materials plications such as portable refrigerators, beverage coolers, electronic should possess large Seebeck coefficients, high electrical conductivity component coolers, and metal alloy sorting devices. Furthermore it and low thermal conductivity. These three values define the so called is used in thermoelectric generators for waste heat recovery (for ex- ample in cars to decrease CO2 emission) and solid state cooling or peltier-elements. Thermoelectric generators...

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Measurement principle Seebeck Effect and Electric Resistivity The following picture shows the design of the measurement system. The sample is in a vertical way between the upper and the lower block. The lower block includes a secondary heater that causes a tempe- rature gradient. For the determination of the Seebeck-Coefficient the temperature difference and the thermo-electromotoric force dE (vol- With determination of the sample geometry and the distance of the tage) will be measured. The Seebeck-Coefficient can now be calcula- thermocouples the electric resistivity can be calculated. ted...

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Thermal Conductivity / Thermal Diffusivity Principal of Measurement: Laser Flash The sample is positioned on a sample holder, located in a furnace. The Correspondence with International Standards. The LINSEIS LFA and XFA furnace is then held at a predetermined temperatures. At this tempera- operate in agreement with national and international standards such ture the sample surface is then irradiated with a programmed energy pulse (laser or xenon flash). This energy pulse results in a homogeneous temperature rise at the sample surface. The resulting temperature LINSEIS is offering an...

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Measurement of a sample of the tellur family A batch of samples of the tellur family enriched with bismuth and an- tivity K in relation to temperature. The thermal diffusivity can directly be timony (BiSb)2Te3 was evaluated. As an example this can be a test measured with the LFA (Laser Flash system), and with the density (from series with changes in the chemical mixture and changes in the way the Dilatometer measurement) and the specific heat Cp (from the DSC the samples are manufactured. With the determination of the figure of measurement) the heat conductivity λ can be calculated. merit...

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Figure of Merit (calculation) above temperature of (BiSb)2Te3 0.6 A4 Figure of Merit 0.4 From the LFA and LSR measurement an calculation: ZT=

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LINSEIS GmbH Vielitzerstr. 43 95100 Selb Germany Tel.: (+49) 9287–880 - 0 Fax: (+49) 9287–70488 E-mail: info@linseis.de LINSEIS Inc. 109 North Gold Drive Robbinsville, NJ 08691 USA Tel.: (+1) 609 223 2070 Fax: (+1) 609 223 2074 E-mail: info@linseis.com LINSEIS France Bureaux Paris 52 Boulevard Sébastopol 75003 Paris Tel.: (+33) 173-028 272 www.linseis.com Products: DIL, TG, STA, DSC, HDSC, DTA, TMA, MS/FTIR, In-Situ EGA, Laser Flash, Seebeck Effect, Thin Film Analyzer, Hall-Effect Services: Service Lab, Calibration Servi

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