Recent Developments in Bulk Thermoelectric Materials

Nolas, George S.; Poon, Joseph; Kanatzidis, Mercouri G.

doi:10.1557/mrs2006.45

Cited by 434 publications

(305 citation statements)

References 54 publications

Supporting

Mentioning

276

Contrasting

Unclassified

Order By: Relevance

“…The thermoelectric properties of Half-Heusler compounds have been studied 3,4 . One benefit is that the thermoelectric properties of half-Heusler compounds can be tailored by substitution on each of the three atomic positions.…”

Section: Introductionmentioning

confidence: 99%

Abinitiodetermination of crystal structures of the thermoelectric material MgAgSb

et al. 2012

View full text Add to dashboard Cite

Materials with the half-Heusler structure possess interesting electrical and magnetic properties, including potential for thermoelectric applications. MgAgSb is compositionally and structurally related to many half-Heusler materials, but has not been extensively studied. This work presents the high-temperature X-ray diffraction analysis of MgAgSb between 27 and 420°C, complemented with thermoelectric property measurements.MgAgSb is found to exist in three different crystal structures in this temperature region, taking the half-Heusler structure at high temperatures, a Cu 2 Sb-related structure at intermediate temperatures, and a previously unreported tetragonal structure at room temperature. All three structures are related by a distorted Mg-Sb rocksalt-type sublattice, differing primarily in the Ag location among the available tetrahedral sites. Transition temperatures between the three phases correlate well with discontinuities in the Seebeck coefficient and electrical conductivity; the best performance occurs with the novel room temperature phase. For application of MgAgSb as a thermoelectric material, it may be desirable to develop methods to stabilize the room temperature phase at higher temperatures.

show abstract

Section: Introductionmentioning

confidence: 99%

Abinitiodetermination of crystal structures of the thermoelectric material MgAgSb

et al. 2012

View full text Add to dashboard Cite

show abstract

“…1,2 The efficiency of such materials is determined by the thermoelectric figure of merit ZT = a 2 rT/j with a being the Seebeck coefficient, r the electrical conductivity, j the thermal conductivity, and T the absolute temperature. High ZT values can be expected neither for insulators, which show low electrical conductivity r, nor for metals with low thermopower a.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of Polycrystalline SrZn2Sb2 Prepared by Spark Plasma Sintering

Zhang

Tang

Schnelle

et al. 2010

Journal of Elec Materi

View full text Add to dashboard Cite

Compact polycrystalline samples of SrZn 2 Sb 2 [space group P3m1, a = 4.503(1) Å , c = 7.721(1) Å ] were prepared by spark plasma sintering. Thermoelectric performance, Hall effect, and magnetic properties were investigated in the temperature range from 2 K to 650 K. The thermoelectric figure of merit ZT was found to increase with temperature up to ZT = 0.15 at 650 K. At this temperature the material showed a high Seebeck coefficient of +230 lV K À1 , low thermal conductivity of 1.3 W m À1 K À1 , but rather low electrical conductivity of 54 S cm À1 , together with a complex temperature behavior. SrZn 2 Sb 2 is a diamagnetic p-type conductor with a carrier concentration of 5 9 10 18 cm À3 at 300 K. The electronic structure was calculated within the density-functional theory (DFT), revealing a low density of states (DOS) of 0.43 states eV À1 cell À1 at the Fermi level.

show abstract

“…The electrochemistry experiments and the electro-deposition were performed in aqueous electrolyte solutions containing the chemicals of interest, Sb 2 O 3 (99.99 %), CoSO 4 . 7H 2 O (> 99 %), C 6 H 7 KO 7 (potassium citrate monobasic) (> 99.5), C 6 H 8 O 7 (citric acid) (> 99.5 %) and TeO 2 (99.995 %).…”

Section: Methodsmentioning

confidence: 99%

“…This is an excellent example of the PGEC concept in which phonon scattering centers can be introduced in the unit cell to lower the lattice thermal conduc-tivity. Most of today s research focuses on reducing lattice thermal conductivity by introducing large heavy atoms into the skutterudite structure [2,4], which can be achieved by doping.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Ni and Te‐doped Cobalt Triantimonide in Citrate Solutions

et al. 2015

View full text Add to dashboard Cite

Skutterudite compounds form a new class of potential candidates for thermoelectric applications. Cobalt triantimonide (CoSb3) shows good thermoelectric properties at medium and high temperatures. Doping this system with substitution elements, for either Co or Sb or both, may result in an increase of the thermoelectric figure of merit (ZT). This work focused on the electrochemical doping and characterization of films and nanowires of Co‐Sb system in citrate solutions using gold‐coated PCTE templates. The electrodeposition was performed on gold surface that was pre‐treated electrochemically to ensure reproducible results. The electrochemical treatment acted as an annealing process for the surface, which resulted in an increase in Au(111) as demonstrated by XRD. Detailed electrochemical studies including deposition‐stripping experiments was performed in order to develop a better understanding of the co‐deposition kinetics and a better control over the composition of doped Co‐Sb system. Scanning electron microscopy (SEM/EDS) helped study the morphology and the composition of the doped and undoped Co‐Sb system. Co‐deposition of Co‐Sb showed that the amount of Co is higher in nanowires than in film or mushroom caps due to the slow Sb deposition rate dictated by slow Sb(III) complex diffusion. Doped nanowires have been also obtained. Both Ni and Te electrochemical doping of the Co‐Sb system affected the composition of the deposit but there was no effect on nanowire morphology.

show abstract

Recent Developments in Bulk Thermoelectric Materials

Cited by 434 publications

References 54 publications

Abinitiodetermination of crystal structures of the thermoelectric material MgAgSb

Abinitiodetermination of crystal structures of the thermoelectric material MgAgSb

Thermoelectric Properties of Polycrystalline SrZn2Sb2 Prepared by Spark Plasma Sintering

Electrodeposition of Ni and Te‐doped Cobalt Triantimonide in Citrate Solutions

Contact Info

Product

Resources

About