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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Huppertz, Hubert / Petrícek, Václav / Tiekink, E. R. T.

12 Issues per year


IMPACT FACTOR 2016: 3.179

CiteScore 2016: 3.30

SCImago Journal Rank (SJR) 2016: 1.097
Source Normalized Impact per Paper (SNIP) 2016: 2.592

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2196-7105
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Volume 225, Issue 11 (Nov 2010)

Issues

From phase-change materials to thermoelectrics?

Matthias N. Schneider / Tobias Rosenthal / Chrsitian Stiewe / Oliver Oeckler
Published Online: 2010-09-15 | DOI: https://doi.org/10.1524/zkri.2010.1320

Abstract

Metastable tellurides play an important role as phase-change materials in data storage media and non-vol atile RAM devices. The corresponding crystalline phases with very simple basic structures are not stable as bulk materials at ambient conditions, however, for a broad range of compositions they represent stable high-temperature phases. In the system Ge/Sb/Te, rocksalt-type high-temperature phases are characterized by a large number of vacancies randomly distributed over the cation position, which order as 2D vacancy layers upon cooling. Short-range order in quenched samples produces pronounced nanostructures by the formation of twin domains and finite intersecting vacancy layers. As phase-change materials are usually semimetals or small-bandgap semiconductors and efficient data storage requires low thermal conductivity, bulk materials with similar compositions and properties can be expected to exhibit promising thermoelectric characteristics. Nanostructuring by phase transitions that involve partial vacany ordering may enhance the efficiency of such thermoelectrics. We have shown that germanium antimony tellurides with compositions close to those used as phase-change materials in rewritable Blu-Ray Discs, e.g. (GeTe)12Sb2Te3, exhibit thermoelectric figures of merit of up to ZT = 1.3 at 450 °C if a nanodomain structure is induced by rapidly quenching the cubic high-temperature phase. Structural changes have been elucidated by X-ray diffraction and high-resolution electron microscopy.

Keywords: Thermoelectrics; Phase-change materials; Tellurides; Nanostructuring

About the article

* Correspondence address: LMU Munich, Department of Chemistry, Butenandtstraße 5-13 (Haus D), 81377 Munich,


Published Online: 2010-09-15

Published in Print: 2010-11-01


Citation Information: Zeitschrift für Kristallographie Crystalline Materials, ISSN (Print) 0044-2968, DOI: https://doi.org/10.1524/zkri.2010.1320.

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