Nanostructures in metastable GeBi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Te<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>obtained by high-pressure synthesis and rapid quenching and their influence on physical properties

Schröder, Thorsten; Schneider, Matthias N.; Rosenthal, Tobias; Eisele, Andreas; Gold, Christian; Scheidt, Ernst‐Wilhelm; Scherer, Wolfgang; Berthold, Rico

doi:10.1103/physrevb.84.184104

Cited by 13 publications

(7 citation statements)

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“…For this reason, PCMs have become interesting as thermoelectric materials, particularly since they are known to exhibit lamellar and unusual nanostructures [47][48][49] which have the potential to further reduce thermal conductivity and thus increase ZT. 50 For example, (GeTe) 12 Sb 2 Te 3 located on the pseudobinary section of the classic IV-VI and V-VI thermoelectric materials GeTe and Sb 2 Te 3 was shown to have a ZT of 1.3 at 450 °C. 51 Similar research was carried out on some members of the (GeTe) n (Bi 2 Te 3 ) m series yielding lower ZT values in the range of 0.5 to 1.2.…”

Section: Introductionmentioning

confidence: 99%

“…51 Similar research was carried out on some members of the (GeTe) n (Bi 2 Te 3 ) m series yielding lower ZT values in the range of 0.5 to 1.2. [52][53][54][55] However, to the authoŕs best knowledge no attempts have been published to actually use any PCM and thermoelectric materials to fabricate and characterize a working and efficient thermoelectric module including, among other technical challenges, the necessary development of low-resistance electrical contacts.…”

Section: Introductionmentioning

confidence: 99%

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Thermoelectric efficiency of (1 − x)(GeTe) x(Bi₂Se_0.2Te_2.8) and implementation into highly performing thermoelectric power generators

et al. 2015

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Here we report for the first time on a complete simulation assisted "material to module" development of a high performance thermoelectric generator (TEG) based on the combination of a phase change material and established thermoelectrics yielding the compositions (1 - x)(GeTe) x(Bi(2)Se(0.2)Te(2.8)). For the generator design our approach for benchmarking thermoelectric materials is demonstrated which is not restricted to the determination of the intrinsically imprecise ZT value but includes the implementation of the material into a TEG. This approach is enabling a much more reliable benchmarking of thermoelectric materials for TEG application. Furthermore we analyzed the microstructure and performance close to in-operandi conditions for two different compositions in order to demonstrate the sensitivity of the material against processing and thermal cycling. For x = 0.038 the microstructure of the as-prepared material remains unchanged, consequently, excellent and stable thermoelectric performance as prerequisites for TEG production was obtained. For x = 0.063 we observed strain phenomena for the pristine state which are released by the formation of planar defects after thermal cycling. Consequently the thermoelectric performance degrades significantly. These findings highlight a complication for deriving the correlation of microstructure and properties of thermoelectric materials in general.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermoelectric efficiency of (1 − x)(GeTe) x(Bi₂Se_0.2Te_2.8) and implementation into highly performing thermoelectric power generators

et al. 2015

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“…for Ge 2 Bi 2 Te 5 (Matsunaga et al, 2007). Rhombohedrally distorted rocksalt-like products with average CuPt structure type were obtained by high-pressure high-temperature synthesis (Schrö der et al, 2011). Cubic samples obtained from the melt were also reported for Bi-doped GeTe with low Bi content (Abrikosov & Danilova-Dobryakova, 1972).…”

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confidence: 99%

Real structure of Ge₄Bi₂Te₇: refinement on diffuse scattering data with the 3D-ΔPDF method

2015

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Metastable Ge 4 Bi 2 Te 7 is highly disordered; the average structure corresponds to the rocksalt type. The diffraction pattern shows diffuse streaks interconnecting Bragg reflections along all cubic h111i directions. These streaks exhibit satellitelike maxima and arise from vacancy ordering in non-periodically spaced defect layers. The atom layers near these vacancy layers are displaced with respect to the average structure: they tend to form -GeTe-type double layers. The threedimensional difference pair distribution function (3D-ÁPDF) method yields quantitative information on the distribution of defect layer spacings, which peaks at a value corresponding to Ge 3 Bi 2 Te 6 building blocks. The cation distribution along with the displacement of the atom layers is refined as well, using a least-squares approach. Bi concentrates on cation positions next to the vacancy layers.

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“…Figure 6). Without annealing, a cold‐pressed pellet of melt‐spun particles would exhibit very high resistivity values caused by grain boundaries as observed for melt‐spun GeBi 2 Te 4 25. Thermal treatment at 310 °C leads to the decomposition mentioned above (cf.…”

Section: Resultsmentioning

confidence: 91%

Two Synthetic Approaches to Ag_3.4In_3.7Sb_76.4Te_16.5 Bulk Samples and their Transport Properties

Schröder

Rosenthal

Gold

et al. 2013

Zeitschrift anorg allge chemie

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Bulk samples with the chemical composition of the AIST phase-change material Ag 3.4 In 3.7 Sb 76.4 Te 16.5 were synthesized by melt spinning as well as under high-pressure conditions (12 GPa), respectively. Rietveld refinements as well as selected-area electron diffraction patterns and high-resolution transmission electron images show that both types of samples crystallize in the gray As structure type. All atoms are disordered on one Wyckoff position. The metrics of the high-pressure sample appear compressed along [001] compared to the

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Nanostructures in metastable GeBi2Te4obtained by high-pressure synthesis and rapid quenching and their influence on physical properties

Cited by 13 publications

References 30 publications

Thermoelectric efficiency of (1 − x)(GeTe) x(Bi₂Se_0.2Te_2.8) and implementation into highly performing thermoelectric power generators

Thermoelectric efficiency of (1 − x)(GeTe) x(Bi₂Se_0.2Te_2.8) and implementation into highly performing thermoelectric power generators

Real structure of Ge₄Bi₂Te₇: refinement on diffuse scattering data with the 3D-ΔPDF method

Two Synthetic Approaches to Ag_3.4In_3.7Sb_76.4Te_16.5 Bulk Samples and their Transport Properties

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Nanostructures in metastable GeBi2Te4obtained by high-pressure synthesis and rapid quenching and their influence on physical properties

Cited by 13 publications

References 30 publications

Thermoelectric efficiency of (1 − x)(GeTe) x(Bi2Se0.2Te2.8) and implementation into highly performing thermoelectric power generators

Thermoelectric efficiency of (1 − x)(GeTe) x(Bi2Se0.2Te2.8) and implementation into highly performing thermoelectric power generators

Real structure of Ge4Bi2Te7: refinement on diffuse scattering data with the 3D-ΔPDF method

Two Synthetic Approaches to Ag3.4In3.7Sb76.4Te16.5 Bulk ­Samples and their Transport Properties

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Product

Resources

About

Thermoelectric efficiency of (1 − x)(GeTe) x(Bi₂Se_0.2Te_2.8) and implementation into highly performing thermoelectric power generators

Thermoelectric efficiency of (1 − x)(GeTe) x(Bi₂Se_0.2Te_2.8) and implementation into highly performing thermoelectric power generators

Real structure of Ge₄Bi₂Te₇: refinement on diffuse scattering data with the 3D-ΔPDF method

Two Synthetic Approaches to Ag_3.4In_3.7Sb_76.4Te_16.5 Bulk Samples and their Transport Properties