Enhanced thermoelectric properties of BaZn<sub>2</sub>Sb<sub>2</sub>via a synergistic optimization strategy using co-doped Na and Sr

Yan, Ruijuan; Lv, Wanyu; Wang, Ke; Guo, Kai; Yang, Xinxin; Luo, Jun; Zhao, Jing‐Tai

doi:10.1039/c6ta03012b

Cited by 21 publications

(17 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One should also recall that the α-BaCu 2 S 2 and ThCr 2 Si 2 structure types not only contain several compounds that undergo structural phase transitions but also show interesting thermoelectric properties. The α- and β-polymorphs of BaZn 2 As 2 as well as their K-doped counterparts, for instance, have been the subject of recent investigations based on each compound’s potential for thermoelectric applications. , BaZn 2 Sb 2 , crystallizing in the α-BaCu 2 S 2 structure type, has also been the subject of research efforts looking into the thermoelectric potential and doping optimization of the compound. With different crystal chemistry occurring for compounds crystallizing with Bi within their crystal structures, it is clear that the P analogues of these “1–2–2” phases are worthy of exploration based on their interesting structures and their potential for high thermoelectric merit.…”

Section: Introductionmentioning

confidence: 99%

Two Polymorphs of BaZn₂P₂: Crystal Structures, Phase Transition, and Transport Properties

et al. 2021

View full text Add to dashboard Cite

The novel α-BaZn2P2 structural polymorph has been synthesized and structurally characterized for the first time. Its structure, elucidated from single crystal X-ray diffraction, indicates that the compound crystallizes in the orthorhombic α-BaCu2S2 structure type, with unit cell parameters a = 9.7567(14) Å, b = 4.1266(6) Å, and c = 10.6000(15) Å. With β-BaZn2P2 being previously identified as belonging to the ThCr2Si2 family and with the precedent of structural phase transitions between the α-BaCu2S2 type and the ThCr2Si2 type, the potential for the pattern to be extended to the two different structural forms of BaZn2P2 was explored. Thermal analysis suggests that a first-order phase transition occurs at ∼1123 K, whereby the low-temperature orthorhombic α-phase transforms to a high-temperature tetragonal β-BaZn2P2, the structure of which was also studied and confirmed by single-crystal X-ray diffraction. Preliminary transport properties and band structure calculations indicate that α-BaZn2P2 is a p-type, narrow-gap semiconductor with a direct bandgap of 0.5 eV, which is an order of magnitude lower than the calculated indirect bandgap for the β-BaZn2P2 phase. The Seebeck coefficient, S(T), for the material increases steadily from the room temperature value of 119 μV/K to 184 μV/K at 600 K. The electrical resistivity (ρ) of α-BaZn2P2 is relatively high, on the order of 40 mΩ·cm, and the ρ(T) dependence shows gradual decrease upon heating. Such behavior is comparable to those of the typical semimetals or degenerate semiconductors.

show abstract

Section: Introductionmentioning

confidence: 99%

Two Polymorphs of BaZn₂P₂: Crystal Structures, Phase Transition, and Transport Properties

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Therefore, it has been quite challenging to develop highly efficient thermoelectric materials. The strategic goals of TE research are to discover new materials with high TE performance and/or improve the performance of the existing well-known materials, such as SiGe alloy [10], PbTe [11], chalcogenides [12], skutterudites [13,14], clathrates [15,16], Zintl phases [17] as well as full/half-Heusler compounds [18,19] by band engineering and carrier filtering effect [20][21][22], phonon engineering [23,24], reducing the dimension of materials [25], or spin fluctuation [26].…”

Section: Introductionmentioning

confidence: 99%

Realizing p-type NbCoSn half-Heusler compounds with enhanced thermoelectric performance via Sc substitution

Yan

Xie

Balke

et al. 2020

Science and Technology of Advanced Materials

Self Cite

View full text Add to dashboard Cite

N-type half-Heusler NbCoSn is a promising thermoelectric material due to favourable electronic properties. It has attracted much attention for thermoelectric applications while the desired p-type NbCoSn counterpart shows poor thermoelectric performance. In this work, p-type NbCoSn has been obtained using Sc substitution at the Nb site, and their thermoelectric properties were investigated. Of all samples, Nb 0.95 Sc 0.05 CoSn compound shows a maximum power factor of 0.54 mW/mK 2 which is the highest among the previously reported values of p-type NbCoSn. With the suppression of thermal conductivity, p-type Nb 0.95 Sc 0.05 CoSn compound shows the highest measured figure of merit ZT = 0.13 at 879 K.

show abstract

“…Figure a shows the simplified quality factor β/ A ( A = constant) at 300 K for some typical Zintl compounds, ,,,− which can be roughly utilized to evaluate the effect of doping on the thermoelectric figure of merit zT . For CaZn 2 Sb 2 and EuZn 2 Sb 2 , the alloy and doping effects had limited success in increasing the quality factor and thus could not improve the thermoelectric properties.…”

Section: Results and Discussionmentioning

confidence: 99%

“…(a) Quality factor β/ A ( A = constant) of typical Zintl phase compounds. ,,,,− (b) Temperature dependence of zT values of BaCu 2– x Ag x Te 2 ( x = 0–0.1) samples. The inset shows the corresponding average zT values in our measured temperature range.…”

Section: Results and Discussionmentioning

confidence: 99%

Realizing High Thermoelectric Performance in BaCu_2–xAg_xTe₂ through Enhanced Carrier Effective Mass and Point-Defect Scattering

Yang

Guo

Yang

et al. 2018

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

With the aim of realizing mid-temperature thermoelectric materials, the electrical and thermal transport properties of the Zintl phase compound BaCu2Te2 with a channel structure (Pnma) were systematically investigated. BaCu2Te2 exhibits moderate electrical transport properties and low intrinsic thermal conductivity, which contribute to its high thermoelectric figure of merit (zT = 0.72 at 823 K). The partial substitution of Cu with Ag led to a significant enhancement of the Seebeck coefficient, as the carrier effective mass increased from 1.0m 0 for BaCu2Te2 to 1.5m 0 for BaCu1.9Ag0.1Te2 at room temperature, and reduction of the Hall carrier concentration. In addition, at higher temperature, a lower thermal conductivity of ∼0.5 W m–1 K–1 was achieved for BaCu1.9Ag0.1Te2; this reduced thermal conductivity resulted from the point-defect scattering arising from the Ag/Cu isovalent substitution. Together, these integrated effects led to a significant improvement of the quality factor β with a peak thermoelectric figure of merit zT of 1.08 for BaCu1.9Ag0.1Te2 at 823 K. The average zT of BaCu1.9Ag0.1Te2 over the temperature range of 323–823 K was 0.68, demonstrating its potential as a promising thermoelectric Zintl compound in the mid-temperature range.

show abstract

Enhanced thermoelectric properties of BaZn₂Sb₂via a synergistic optimization strategy using co-doped Na and Sr

Abstract: Polycrystalline samples of Ba1−x−yNaxSryZn2Sb2 (0 ≤ x ≤ 0.1, 0 ≤ y ≤ 0.1) were prepared by a solid-state reaction method and hot press sintering with the aim of achieving synergistic optimization of the power factor and thermal conductivity.

Cited by 21 publications

References 26 publications

Two Polymorphs of BaZn₂P₂: Crystal Structures, Phase Transition, and Transport Properties

Two Polymorphs of BaZn₂P₂: Crystal Structures, Phase Transition, and Transport Properties

Realizing p-type NbCoSn half-Heusler compounds with enhanced thermoelectric performance via Sc substitution

Realizing High Thermoelectric Performance in BaCu_2–xAg_xTe₂ through Enhanced Carrier Effective Mass and Point-Defect Scattering

Contact Info

Product

Resources

About

Enhanced thermoelectric properties of BaZn2Sb2via a synergistic optimization strategy using co-doped Na and Sr

Abstract: Polycrystalline samples of Ba1−x−yNaxSryZn2Sb2 (0 ≤ x ≤ 0.1, 0 ≤ y ≤ 0.1) were prepared by a solid-state reaction method and hot press sintering with the aim of achieving synergistic optimization of the power factor and thermal conductivity.

Cited by 21 publications

References 26 publications

Two Polymorphs of BaZn2P2: Crystal Structures, Phase Transition, and Transport Properties

Two Polymorphs of BaZn2P2: Crystal Structures, Phase Transition, and Transport Properties

Realizing p-type NbCoSn half-Heusler compounds with enhanced thermoelectric performance via Sc substitution

Realizing High Thermoelectric Performance in BaCu2–xAgxTe2 through Enhanced Carrier Effective Mass and Point-Defect Scattering

Contact Info

Product

Resources

About

Enhanced thermoelectric properties of BaZn₂Sb₂via a synergistic optimization strategy using co-doped Na and Sr

Two Polymorphs of BaZn₂P₂: Crystal Structures, Phase Transition, and Transport Properties

Two Polymorphs of BaZn₂P₂: Crystal Structures, Phase Transition, and Transport Properties

Realizing High Thermoelectric Performance in BaCu_2–xAg_xTe₂ through Enhanced Carrier Effective Mass and Point-Defect Scattering