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Measurement of Seebeck effect (thermoelectric power) at high pressure up to 40 GPa |
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| Authors: | Vladimir V. Shchennikov Andrei Y. Manakov |
| Affiliation: | a High Pressure Group, Institute of Metal Physics of Russian Academy of Sciences, Urals Division, 18S. Kovalevskaya Str., GSP-170, Yekaterinburg 620041, Russia b The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Chiba, Japan c Institut de Minéralogie et de Physique des Milieux Condensés, Université Pierre et Marie Curie Paris 6—CNRS, 140 rue de Lourmel, 75015 Paris, France d A.V. Nikolaev Institute of Inorganic Chemistry of Russian Academy of Sciences, Siberian Division, Novosibirsk 630090, Russia |
| Abstract: | The paper reports details of a high-pressure thermoelectric power (Seebeck effect) technique up to 40 GPa. Several different types of high-pressure cells with anvil insets are presented. The technique was applied for measurements of pressure dependence of the thermopower of several substances including elemental metals (lead, Pb; indium, In), cerium-nickel alloy, Ce-Ni and sulphur, S. Two peculiarities in the pressure dependences of the thermopower of CeNi were found and attributed to structural transformations, near ∼5 and ∼10 GPa. These transitions were confirmed in direct X-ray diffraction studies. Sulphur compressed to 40 GPa exhibited a hole type conductivity and the thermopower value was about ∼+1 mV/K. Additionally, as an example of pressure calibration, the data on the electrical resistivity of zinc selenide, ZnSe, are given in a range of 0-23 GPa. These data suggest three possible scenarios of phase transitions from a rock salt (RS) high-pressure phase of ZnSe under decompression: RS→zinc blende (ZB), RS→cinnabar→ZB, and RS→wurtzite. |
| Keywords: | C. High pressure C. X-ray diffraction D. Electrical properties D. Phase transitions D. Transport properties |
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