Optimization of hot-press conditions of Zn4Sb3 for high thermoelectric performance

Ueno, K.; Yamamoto, Atsushi; Noguchi, Tamotsu; Inoue, Takahiro; Sodeoka, Satoshi; Obara, H.

doi:10.1016/j.jallcom.2004.08.078

Cited by 18 publications

(5 citation statements)

References 5 publications

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“…Iversen et al found that the zT value decreased to just one-third of the original value after heating a quenched sample to 673 K because of the decomposition of Zn 4 Sb 3 into ZnSb, Sb, and Zn. , Moreover, a pronounced difference in zT values indicates that a high density is a prerequisite for good thermoelectric performance . The typical relative density of hot-pressed β-Zn 4 Sb 3 pellets is 90–97%. − SPS pressing is another widely used pressing method, in which joule heat is generated by large pulsed direct current passing through the graphite pressing die and the material itself. The fast heating rate (up to 1000 degrees per minute) significantly reduces the duration of the pressing process .…”

Section: Introductionmentioning

confidence: 99%

Fast Direct Synthesis and Compaction of Homogenous Phase-Pure Thermoelectric Zn₄Sb₃

Yin

Blichfeld

Christensen

et al. 2014

ACS Appl. Mater. Interfaces

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Zn4Sb3 is among the cheapest high performance thermoelectric materials, and it is made of relatively nontoxic elements. Strong activities are aimed at developing commercial power generation modules based on Zn4Sb3 making it vital to develop fast reliable synthesis processes for high-quality material. Here direct synthesis and compaction of homogeneous phase-pure thermoelectric Zn4Sb3 by spark plasma sintering (SPS) has been developed. Compared with the traditional quench and press method, the complexity and process time of the new method is very significantly reduced (order of magnitude), making large-scale production feasible. A composition gradient is observed in the pellet along the axis of applied pressure and current. The homogeneity of the pressed pellets is studied as a function of the SPS parameters: sintering time, applied current, sintering temperature and applied pressure, and the mechanism behind the formation of the gradient is discussed. The key finding is that pure and homogeneous Zn4Sb3 pellets can be produced by adding an extra layer of elemental Zn foil to compensate the Zn migration.

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Section: Introductionmentioning

confidence: 99%

Fast Direct Synthesis and Compaction of Homogenous Phase-Pure Thermoelectric Zn₄Sb₃

Yin

Blichfeld

Christensen

et al. 2014

ACS Appl. Mater. Interfaces

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“…In previous papers [3,4], we have studied the effect of hot-pressing conditions on thermoelectric and mechanical properties ofZn 4 Sb 3 , and have found that the thermoelectric performance of the material can be improved by optimizing the fabrication conditions. In addition, it was revealed that the starting powder size had significant influence on mechanical properties [5], while transport properties seem to be dominated by the oxygen content of the starting powder. A more detailed study is required to investigate the effect of oxygen contamination on the thermoelectric properties of -Zn 4 Sb 3 .…”

Section: Introductionmentioning

confidence: 99%

Effect of impurity oxygen concentration on the thermoelectric properties of hot-pressed Zn4Sb3

Ueno

Yamamoto

Noguchi

et al. 2006

Journal of Alloys and Compounds

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“…For example, as shown in Figure 3, the A-3 hot pressed sample exhibited Sb phase in addition to Zn 4 Sb 3 and ZnSb phases. The theoretical density of Sb is 6.69 g/cm 3 [23,24], causing the relative density to be slightly higher than the others. Similar experimental results have been reported by Ueno and Yamamoto [25] who investigated Zn 4.08 Sb 3 with different oxygen content.…”

Section: Vacuum Sintering and Vacuum Hot Pressing Of Bulk Zn 4 Sb 3 Amentioning

confidence: 83%

Evolution of Thermoelectric Properties of Zn4Sb3 Prepared by Mechanical Alloying and Different Consolidation Routes

Lee

Lin

2018

Energies

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Abstract:In this research, a method combining the mechanical alloying with the vacuum sintering or hot pressing was adopted to obtain the compact of β-Zn 4 Sb 3 . Pure zinc and antimony powders were used as the starting material for mechanical alloying. These powders were mixed in the stoichiometry ratio of 4 to 3, or more Zn-rich. Single phase Zn 4 Sb 3 was produced using a nominally 0.6 at. % Zn rich powder. Thermoelectric Zn 4 Sb 3 bulk specimens have been fabricated by vacuum sintering or hot pressing of mechanically alloyed powders at various temperatures from 373 to 673 K. For the bulk specimens sintering at high temperature, phase transformation of β-Zn 4 Sb 3 to ZnSb and Sb was observed due to Zn vaporization. However, single-phase Zn 4 Sb 3 bulk specimens with 97.87% of theoretical density were successfully produced by vacuum hot pressing at 473 K. Electric resistivity, Seebeck coefficient, and thermal conductivity were evaluated for the hot pressed specimens from room temperature to 673 K. The results indicate that the Zn 4 Sb 3 shows an intrinsic p-type behavior. The increase of Zn 4 Sb 3 phase ratio can increase Seebeck coefficient but decrease electric conductivity. The maximum power factor and figure of merit (ZT) value were 1.31 × 10 −3 W/mK 2 and 0.81 at 600 K, respectively. The ZT value was lower than that reported in the available data for materials prepared by conventional melt growth and hot pressed methods, but higher than the samples fabricated by vacuum melting and heat treatment techniques.

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Optimization of hot-press conditions of Zn4Sb3 for high thermoelectric performance

Cited by 18 publications

References 5 publications

Fast Direct Synthesis and Compaction of Homogenous Phase-Pure Thermoelectric Zn₄Sb₃

Fast Direct Synthesis and Compaction of Homogenous Phase-Pure Thermoelectric Zn₄Sb₃

Effect of impurity oxygen concentration on the thermoelectric properties of hot-pressed Zn4Sb3

Evolution of Thermoelectric Properties of Zn4Sb3 Prepared by Mechanical Alloying and Different Consolidation Routes

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Optimization of hot-press conditions of Zn4Sb3 for high thermoelectric performance

Cited by 18 publications

References 5 publications

Fast Direct Synthesis and Compaction of Homogenous Phase-Pure Thermoelectric Zn4Sb3

Fast Direct Synthesis and Compaction of Homogenous Phase-Pure Thermoelectric Zn4Sb3

Effect of impurity oxygen concentration on the thermoelectric properties of hot-pressed Zn4Sb3

Evolution of Thermoelectric Properties of Zn4Sb3 Prepared by Mechanical Alloying and Different Consolidation Routes

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Fast Direct Synthesis and Compaction of Homogenous Phase-Pure Thermoelectric Zn₄Sb₃

Fast Direct Synthesis and Compaction of Homogenous Phase-Pure Thermoelectric Zn₄Sb₃