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SM ISO690:2012 NIKOLAEVA, Albina, KONOPKO, Leonid, HUBER, Tito, TSURKAN, Ana, KOTOMAN, Tatiana. NNN 26 P Anisotropy of transport effects in Bi and Bi-Sn wires. In: Materials Science and Condensed Matter Physics, Ed. 6, 11-14 septembrie 2012, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2012, Editia 6, p. 235. ISBN 978-9975-66-290-1. |
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Materials Science and Condensed Matter Physics Editia 6, 2012 |
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Conferința "Materials Science and Condensed Matter Physics" 6, Chișinău, Moldova, 11-14 septembrie 2012 | |||||
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Pag. 235-235 | |||||
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Duet to particular interest in thin wires of bismuth for thermoelectric energy conversion [1,2], there appears the natural question of wires diameter influence on the value and dynamic development of anisotropy of transport phenomena in them under the influence of temperature, magnetic field, doping. In bulk crystals of bismuth anisotropy of this effects is determined mainly by the localization of actual energy extremes topology of isoenergetic surfaces corresponding to them and position of Fermi level. In term being more habitual for transport effects by type and concentration of the charge of carriers, value and anisotropy of their mobility [3,4]. The anisotropy of resistance and thermopower of glass insulated pure and tin-doped bismuth wiresare studied both in the absence of the magnetic field and in weak and strong magnetic fields. The wires with diameters in the range 100 nm ÷ 50 μm with standard orientatio n – (1011) along the wire axis are fabricated by liquid phase casting. The wires with trigonal orientation are fabricated by zone recrystallization with seed. The crystallographic orientation of glass insulated wires are studied by X-ray diffraction method, method of angular rotation diagrams of transverse magnetoresistance and Shubnikov de Haas oscillations [5,6]. It is shown that in pure wires of bismuth the direction and value of magnetic field have a significant influence on thermopower anisotropy. The optimal directions of magnetic field leading to increase of thermopower anisotropy were established. The doping with 0,05at%Sn leads to a significant increase of thermopower anisotropy in wires with diameter up to 0,7-1 μm in the temperature range 250-300 K, that is important for design of transverse anisotropic thermoelements. |
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