Phase transitions of p-type (Pb,Sn,Ge)Te-based alloys for thermoelectric applications

Gelbstein, Yaniv; Ben-Yehuda, O.; Dashevsky, Z.; Dariel, M.P.

doi:10.1016/j.jcrysgro.2009.07.018

Cited by 14 publications

(6 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Following the 450 ∘ C hot pressing conditions, a thermal hysteresis was observed between the heating and cooling cycles while measuring both and values, with the most pronounced differences in the 100-400 ∘ C temperature range. This abnormal and temperature dependent trend can result from the second order phase transition, associated with GeTe based compounds, as was previously reported for single crystal grown Ge Pb 1− Te and Ge Sn 1− Te alloys [12]. In case that as was explained referring to the higher low temperature electrical resistivity values, associated with lower carrier mobility values, compositional inhomogeneity is apparent for this low temperature hot pressing process, compositional variations in the investigated (GeTe) (Bi 2 Te 3 ) 1− quasi-binary system, are expected to result is a decreased phase transition temperature from the low temperature rhombohedral to the high temperature cubic phases, with decreasing of the values.…”

Section: Transport Properties Following Hot Pressing Consolidationsupporting

confidence: 76%

Investigation of the Microstructural and Thermoelectric Properties of the (GeTe) _0.95(Bi2Te3) 0.05 Composition for Thermoelectric Power Generation Applications

Weintraub

Davidow

Tunbridge

et al. 2014

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

In the frame of the current research, thep-type Bi2Te3doped (GeTe)0.95(Bi2Te3)0.05alloy composed of hot pressed consolidated submicron structured powder was investigated. The influence of the process parameters (i.e., powder particles size and hot pressing conditions) on both reduction of the lattice thermal conductivity and electronic optimization is described in detail. Very high maximalZTvalues of up to∼1.6 were obtained and correlated to the microstructural characteristics. Based on the various involved mechanisms, a potential route for further enhancement of theZTvalues of the investigated composition is proposed.

show abstract

Section: Transport Properties Following Hot Pressing Consolidationsupporting

confidence: 76%

Investigation of the Microstructural and Thermoelectric Properties of the (GeTe) _0.95(Bi2Te3) 0.05 Composition for Thermoelectric Power Generation Applications

Weintraub

Davidow

Tunbridge

et al. 2014

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition to the reported high TE performance of GeTe-based materials, its phase transition deforms the lattice of GeTe from a NaCl-type face-centered cubic (β-GeTe) structure to a rhombohedral (α-GeTe) structure 59,60 at ∼ 700 K or below. 61 The subtle changes of the Seebeck coefficient and resistivity in the vicinity of the phase transition temperature have been barely discussed.…”

Section: Introductionmentioning

confidence: 99%

Electronic origin of the high thermoelectric performance of GeTe among the p-type group IV monotellurides

et al. 2017

View full text Add to dashboard Cite

PbTe and SnTe in their p-type forms have long been considered high-performance thermoelectrics, and both of them largely rely on two valence bands (the first band at L point and the second one along the Σ line) participating in the transport properties. This work focuses on the thermoelectric transport properties inherent to p-type GeTe, a member of the group IV monotellurides that is relatively less studied. Approximately 50 GeTe samples have been synthesized with different carrier concentrations spanning from 1 to 20 × 10 20 cm − 3 , enabling an insightful understanding of the electronic transport and a full carrier concentration optimization for the thermoelectric performance. When all of these three monotellurides (PbTe, SnTe and GeTe) are fully optimized in their p-type forms, GeTe shows the highest thermoelectric figure of merit (zT up to 1.8). This is due to its superior electronic performance, originating from the highly degenerated Σ band at the band edge in the low-temperature rhombohedral phase and the smallest effective masses for both the L and Σ bands in the high-temperature cubic phase. The high thermoelectric performance of GeTe that is induced by its unique electronic structure not only provides a reference substance for understanding existing research on GeTe but also opens new possibilities for the further improvement of the thermoelectric performance of this material.

show abstract

“…10,11 Pseudoternary compounds Sn 1Àx Ge x Te and Pb 1Àx Ge x Te were also designed to ensure high electrical conductivities and low thermal conductivities simultaneously, to improve TE performance. [12][13][14] Historically, pressure-induced phase transitions and TE enhancement have been reported in semiconductors. HgTe undergoes a phase transition which is accompanied by changes in thermopower when pressure is applied.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of PbTe, SnTe, and GeTe at High Pressure: an Ab Initio Study

Wang

Zheng

2011

Journal of Elec Materi

View full text Add to dashboard Cite

In this work we present an ab initio study of the transport properties of PbTe, SnTe, and GeTe crystals in the B1 structure under zero and high pressure and analyze the possibility of pressure-induced thermoelectric performance enhancement. GeTe displays higher thermoelectric coefficients in both the p-and n-doping cases at zero pressure, but with applied pressure they drop quickly. n-Type SnTe has a higher Seebeck coefficient and figure of merit (ZT) than p-type SnTe at ambient conditions. With increased pressure its thermoelectric performance is improved initially and degrades later. The highest ZT appears at about 5 GPa. p-Type PbTe possesses attractive thermoelectric properties at zero pressure. With pressure applied, the ZT of this material undergoes a decline-climb-decline variation, and the optimal ZT occurs at 8 GPa to 10 GPa. Thermoelectric properties of n-type PbTe degrade slightly with increasing pressure and improve later; the improvement can be observed for pressures up to 20 GPa. These results suggest possible enhancement of thermoelectric properties for SnTe under intermediate pressure and PbTe under high pressure.

show abstract

Phase transitions of p-type (Pb,Sn,Ge)Te-based alloys for thermoelectric applications

Cited by 14 publications

References 12 publications

Investigation of the Microstructural and Thermoelectric Properties of the (GeTe) _0.95(Bi2Te3) 0.05 Composition for Thermoelectric Power Generation Applications

Investigation of the Microstructural and Thermoelectric Properties of the (GeTe) _0.95(Bi2Te3) 0.05 Composition for Thermoelectric Power Generation Applications

Electronic origin of the high thermoelectric performance of GeTe among the p-type group IV monotellurides

Thermoelectric Properties of PbTe, SnTe, and GeTe at High Pressure: an Ab Initio Study

Contact Info

Product

Resources

About

Phase transitions of p-type (Pb,Sn,Ge)Te-based alloys for thermoelectric applications

Cited by 14 publications

References 12 publications

Investigation of the Microstructural and Thermoelectric Properties of the (GeTe) 0.95(Bi2Te3) 0.05 Composition for Thermoelectric Power Generation Applications

Investigation of the Microstructural and Thermoelectric Properties of the (GeTe) 0.95(Bi2Te3) 0.05 Composition for Thermoelectric Power Generation Applications

Electronic origin of the high thermoelectric performance of GeTe among the p-type group IV monotellurides

Thermoelectric Properties of PbTe, SnTe, and GeTe at High Pressure: an Ab Initio Study

Contact Info

Product

Resources

About

Investigation of the Microstructural and Thermoelectric Properties of the (GeTe) _0.95(Bi2Te3) 0.05 Composition for Thermoelectric Power Generation Applications

Investigation of the Microstructural and Thermoelectric Properties of the (GeTe) _0.95(Bi2Te3) 0.05 Composition for Thermoelectric Power Generation Applications