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Sample seat and measuring method for measuring thermoelectric properties of sample

A technology of thermoelectric properties and sample holders, which is applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc., can solve the problems of easy falling off of thermoelectric heaters, unreliable thermoelectric potential values, etc., and achieve the effect of improving reliability

Inactive Publication Date: 2014-09-24
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the Chinese utility model patent with the patent number 201220366801.6 and the invention name "Test sample holder for thermoelectric materials and its thermoelectric performance measurement device", the sample holder has only one temperature difference heater, which is fixed on the second On the pressing block, during use, especially in high temperature measurement, the thermoelectric heater is easy to fall off, and because there is only one thermoelectric heater, the measured thermoelectric potential value is not reliable enough

Method used

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  • Sample seat and measuring method for measuring thermoelectric properties of sample
  • Sample seat and measuring method for measuring thermoelectric properties of sample
  • Sample seat and measuring method for measuring thermoelectric properties of sample

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Example 1: Measure the thermoelectric potential of the constantan alloy sheet (manufactured by Omega Corporation, USA) constituting the negative electrode of the T-type thermocouple as a function of temperature in the temperature range of 100K-600K. The thickness of the constantan sheet is 0.25mm.

[0076] 1) As shown in Figure 1, two sets of T-type thermocouples 9 and 9' are fixed on both ends of the sample 8 to be tested with silver glue.

[0077] 2) As shown in FIG. 1 , use stainless steel screws 11 , ring-shaped ceramic gaskets 12 and insulating ceramic tubes 13 to assemble the base 2 of the sample holder, the insulating gasket 3 and the first pressing block 4 .

[0078] 3) Place the tested sample 8 on the first pressing block 4 of the sample seat, and fix the two ends of the tested sample 8 with two second pressing blocks 5 respectively; The three compacts 6 are respectively fixed with thermoelectric heaters 7 and 7'.

[0079] 4) Connect the sample holder with the...

Embodiment 2

[0096] Embodiment 2: Simultaneously measure the change of the resistivity and thermoelectric potential of the platinum metal sheet in the 100K-600K temperature interval

[0097] 1) As shown in Figure 1, two sets of T-type thermocouples 9 and 9' are fixed on both ends of the sample 8 to be tested with silver glue.

[0098] 2) At the outer ends of the two sets of T-type thermocouples 9 and 9', use silver glue to fix two copper wires 10 on the sample 8 to be tested respectively, as wires connected to the constant current source 43 when measuring resistance.

[0099] 3) Use stainless steel screws 11 , ring-shaped ceramic gaskets 12 and insulating ceramic tubes 13 to assemble the base 2 of the sample holder, the insulating gasket 3 and the first pressing block 4 .

[0100] 4) Place the tested sample 8 on the first pressing block 4 of the sample holder, and fix the two ends of the tested sample 8 with two second pressing blocks 5 respectively, and the two second pressing blocks 5 pass...

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Abstract

The invention provides a sample seat and measuring method for measuring thermoelectric properties of a sample. With the sample seat and measuring method, reliability of measurement of thermoelectric properties is improved. The sample seat comprises a pedestal (2), an insulating spacer (3), two first pressing blocks (4), two second pressing blocks (5), two third pressing blocks (6) and two temperature-difference heaters (7 and 7'), wherein the insulating spacer (3) is laid on the pedestal (2), the two first pressing blocks (4) are installed on the insulating spacer (3) at an interval, the two second pressing blocks (5) are respectively overlaid on the two first pressing blocks (4) at relative positions, a to-be-measured sample (8) is hung, two ends of the to-be-measured sample (8) are respectively fixed between the first pressing blocks (4) and the second pressing blocks (5), the two third pressing blocks (6) are respectively overlaid on the second pressing blocks (5) at relative positions, and the two temperature-difference heaters (7 and 7') are respectively arranged between one second pressing block (5) and one third pressing block (6).

Description

technical field [0001] The present invention relates to the field of measurement of thermoelectric materials, in particular to a sample holder and a measurement method for measuring thermoelectric properties (eg, thermoelectric potential and resistivity) of samples (eg, thermoelectric materials). Background technique [0002] Thermoelectric materials can realize the direct conversion of thermal energy and electrical energy, and have attracted more and more attention since the 1990s. The performance of thermoelectric materials can be evaluated by the thermoelectric figure of merit ZT (Thermoelectric figure of merit), and its characterization formula is: ZT=S 2 T / ρ(κ L +κ e ), where S is the thermoelectric potential (or Seebeck coefficient), T is the absolute temperature, ρ is the resistivity, κ L is the lattice thermal conductivity, κ e is the electronic thermal conductivity. Thermoelectric potential and resistivity are the two primary physical quantities to describe the...

Claims

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Application Information

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IPC IPC(8): G01N25/48G01R27/14
Inventor 王汉夫官爱强褚卫国郭延军金灏熊玉峰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA