Measurement of thermoelectric power using metal opposed anvil cells up to 100 kbar

Abstract

In this paper we describe the design of a simple Bridgman opposed anvil cell to measure the thermoelectric power of solids as a function of pressure up to 100 kbar. The anvils are made of EN-24 alloy steel hardened to RC55.

High-pressure Seebeck coefficients and thermoelectric behaviors of Bi and PbTe measured using a Paris-Edinburgh cell

“…The polycrystalline nature of our samples alleviates the significance of orientation; however, if any preferred orientation is introduced when pressurizing the sample, it may contribute to the variations. Although there is a significant difference in the values between our measurements and those of Ferdin et al (1995), the values shown in Figs. 7(a) and 7(b) are from separate experimental runs and thus provide evidence for consistency for our apparatus when measuring the Seebeck coefficient under the given experimental conditions.…”

“…Measurements performed by Ferdin et al (1995) show a similar trend for the Seebeck coefficient as a function of pressure. Although the trend agrees, there is a difference between the values as measured in our experiment when compared with those reported by Ferdin et al (1995). As discussed for the results of the temperature measurements, the differences between the two measurements may be attributed to different experimental conditions.…”

“…On comparing the Seebeck coefficient in our measurements at 0.8 GPa and 1.1 GPa near 300 K with the measurements performed by Ferdin et al (1995), we found a difference in absolute values. Our measurements give a value of approximately À34 AE 4 mV K À1 at 1.1 GPa and 325 K and Ferdin et al (1995) measurements yield approximately À60 mV K À1 . This difference may be contributed to by the sensitivity of the electronic properties of Bi to small impurities and the different sample forms with pelleted powder and single crystal, respectively.…”

Pressure Tuning in the Search for New and Improved Solid State Materials

“…The data are in qualitative agreement with earlier data collected by Bridgman anvil high-pressure techniques (the thermopower of bismuth is anisotropic and the sample was not aligned in a particular crystallographic orientation). 33 The phase transitions in bismuth near 2.5 and 7.7 GPa are visible.…”

Measurement of Seebeck effect (thermoelectric power) at high pressure up to 40 GPa

“…At present there are only a few types of high-pressure cells for thermopower measurement, including the large-volume compressible capsules with a liquid media [31,32], DACs with a cross temperature difference [33][34][35][36], and some others [37].…”