The Effect of Impurities on the Thermoelectric Properties of Bi, Te, and Se at Phase Transitions

Abstract

and Bi doped (1 and 1.5 wto/) Bi, Te, and Se is investigated over a large temperature range using solid as well as liquid samples (for Se the amorphous state is also included). The dopants Zn, Ga, In, and Sn strongly affect the thermo e.m.f. of solid but not of liquid Bi. Liquid Te and Se are found to show semiconductor properties determined strongly by impurities, especially for se. The change in the sign of the thermo e.m.f. of liquid Se is explained by the existence of oxygen atoms acting as acceptors.

“Four Birds with One Stone”: Synthesis of Nanostructures of ZnTe, Te, ZnAl2O4, and Te/ZnAl2O4 from a Single‐Source Precursor

“…ZnTe is one of the most important II/VI‐type compound semiconductors, a class of materials that is of considerable interest for potential applications in the fields of sensor technology12 and light‐emitting diodes 13. Trigonal elemental tellurium crystallizes in a noncentrosymmetric space group and shows several interesting properties, for instance, photoconductivity,14a thermoelectricity,14b and piezoelectricity 14c. The zinc spinel ZnAl 2 O 4 is widely used as a catalyst for cracking, dehydration, hydrogenation, and dehydrogenation 15.…”

“Vier auf einen Streich”: Synthese von Nanostrukturen von ZnTe, Te, ZnAl2O4 und Te/ZnAl2O4 aus einer Einkomponentenvorstufe

“…ZnTe ist einer der bedeutendsten II‐VI‐Verbindungshalbleiter, einer Materialklasse, die große Bedeutung für die Sensor‐Technologie12 und LEDs (light emitting diodes)13 aufweist. Trigonales elementares Tellur kristallisiert in einer nicht‐zentrosymmetrischen Raumgruppe und zeigt eine Vielzahl interessanter Eigenschaften wie Photoleitfähigkeit,14a Thermoelektrizität14b und Piezoelektrizität 14c. Der Zinkspinell ZnAl 2 O 4 findet hingegen als Katalysator beim Cracking sowie für Dehydratation, Hydrierung und Dehydrierung Verwendung 15.…”