Effect of high pressure on structure characteristics and electrical transport properties of layered BiCuSeO oxyselenides

Liu, Zhongyuan; Guo, Xin; Yu, Meiling; Wang, Dianzhen; Qin, Jieming; Jin, Fangjun; Xue, Xinghao

doi:10.1016/j.jallcom.2019.152106

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…BiCuSeO prepared via HPHT indicated that lattice parameters (a, c) showed a slight decrease with increasing synthesis pressure from 0.8 to 4 GPa (figure 2(A)) [47]. The analogous cases are observed frequently in Bi 2 Te 3 , PbTe, SiGe, etc, indicating that HPHT, similar to in-situ high-pressure technology, could decrease lattice parameters by applying pressure accompanied by quenching treatment [58][59][60].…”

Section: Crystal Structure and Pressurementioning

confidence: 84%

“…For instance, the Rietveld refinement of XRD data of (A) Rietveld refinement were performed using XRD data of BiCuSeO synthesized at 0.8 and 4 GPa to achieve corresponding lattice parameters. Reprinted from [47], Copyright (2020), with permission from Elsevier. (B) The structural configurations of SnSe induced by pressure [48].…”

Section: Crystal Structure and Pressurementioning

confidence: 99%

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A review of pressure manipulating structure and performance in thermoelectrics

Zhang

Gregory

et al. 2023

J. Phys. D: Appl. Phys.

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Pressure is a fundamental thermodynamic variable that can create exotic materials and modulate transport properties, motivating prosperous progress in multiple fields. As for inorganic thermoelectric materials, pressure is an indispensable condition during a preparation process, which is employed to compress raw powders into the specific shape of solid-state materials for performing properties characterization. In addition to this function, the extra influence of pressure on thermoelectric performance is frequently underestimated and even overlooked. In this review, we summarize recent progress and achievements of pressure-induced structure and performance in thermoelectrics, emphatically involving the modulation of pressure on crystal structure, electrical transport properties, microstructure, and thermal conductivity. According to various studies, the modulated mechanism of pressure on these items above has been discussed in detail, and the perspectives and strategies have been proposed with respect to applying pressure to improve thermoelectric performance. Overall, the purpose of the review is supposed to enrich the understanding of the mechanisms in pressure-induced transport properties and provide a guidance to rationally design a structural pattern to improve thermoelectric performance.

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Section: Crystal Structure and Pressurementioning

confidence: 84%

Section: Crystal Structure and Pressurementioning

confidence: 99%

A review of pressure manipulating structure and performance in thermoelectrics

Zhang

Gregory

et al. 2023

J. Phys. D: Appl. Phys.

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“…[30] The pressure-induced stress can increase power factor to some extent via regulating the band structure, which can be partially trapped via constructing multiple microstructures during HPs. [31,32] These caused microstructures can also scatter phonons to reduce the thermal conductivity. [31] Some TE materials prepared through the HPs have shown good TE performance, especially for the CoSb 3 -based materials by increasing the filling fraction.…”

Section: Introductionmentioning

confidence: 99%

“…[31,32] These caused microstructures can also scatter phonons to reduce the thermal conductivity. [31] Some TE materials prepared through the HPs have shown good TE performance, especially for the CoSb 3 -based materials by increasing the filling fraction. [30,33] Given the above analysis, in this work, a two-step optimization strategy is conducted to improve the TE performance of ZnO, that is, carrier concentration optimization and carrier filtering effect.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Thermoelectric Performance in Robust ZnO‐Based Composite Ceramics Driven by A Stepwise Optimization Strategy

Wang,

Gao,

You

et al. 2023

Adv Funct Materials

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ZnO is a promising high‐temperature thermoelectric (TE) material due to its superior stability and earth abundance. However, the coupling relation between Seebeck coefficient and electrical conductivity on carrier concentration limits the optimum TE performance for most TE materials, especially ZnO. Herein, enhancement of TE performance is achieved via a stepwise optimization strategy composed of carrier concentration optimization and carrier filtering effect for fabricating robust ZnO‐based composite ceramics through a self‐developed specific high‐pressure synthesis followed by spark plasma sintering. Specifically, doping SnO2 provide substantial electrons to surge the carrier concentration. The subsequent compositing Si3N4 nanoparticles results in the unique reaction‐generated Zn2SiO4 nanoprecipitates with a larger bandgap and intrinsically low thermal conductivity, which introduce an excellent carrier filtering effect to increase the Seebeck coefficient by 57.7% at 300 K without compromising electrical conductivity much and enhance phonon scattering to cause an ultralow lattice thermal conductivity of 1.39 W m−1 K−1 achieving amorphous limits of ZnO (1.4±0.1 W m−1 K−1). Consequently, a high peak ZT (figure of merit) of 0.691 at 873 K is obtained, which is higher than that of previously reported ZnO‐based TE materials. This work demonstrates a feasible and effective strategy to fabricate high‐performance TE materials, especially those with inferior electrical conductivity.

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Ultrahigh‐Pressure Structural Modification in BiCuSeO Ceramics: Dense Dislocations and Exceptional Thermoelectric Performance

Yin,

Zhang,

Wang

et al. 2024

Advanced Energy Materials

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Dislocations as line defects in crystalline solids play a crucial role in controlling the mechanical and functional properties of materials. Yet, for functional ceramic oxides, it is very difficult to introduce dense dislocations because of the strong chemical bonds. In this work, the introduction of high‐density dislocations is demonstrated by ultrahigh‐pressure sintering into a typical ceramic oxide, BiCuSeO, for thermoelectric applications. The ultrahigh‐pressure induces shear stresses that surpass the critical strength for dislocation nucleation, followed by dislocation glide and profuse multiplication, leading to a high dislocation density of ≈9.1 × 1016 m−2 in Bi0.96Pb0.04CuSeO ceramic. These dislocations greatly suppress the phonon transport to reduce the lattice thermal conductivity, reaching 0.13 Wm−1 K−1 at 767 K and resulting in a record‐high zT of 1.69 in this oxide thermoelectric ceramic. This study demonstrates the feasibility of generating dense dislocations in ceramic oxides via ultrahigh‐pressure sintering for tuning functional properties.

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Effect of high pressure on structure characteristics and electrical transport properties of layered BiCuSeO oxyselenides

Cited by 5 publications

References 22 publications

A review of pressure manipulating structure and performance in thermoelectrics

A review of pressure manipulating structure and performance in thermoelectrics

Enhancement of Thermoelectric Performance in Robust ZnO‐Based Composite Ceramics Driven by A Stepwise Optimization Strategy

Ultrahigh‐Pressure Structural Modification in BiCuSeO Ceramics: Dense Dislocations and Exceptional Thermoelectric Performance

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