Mechanical alloying of a new promising thermoelectric material, Sb3Zn4

Izard, V.; Record, Marie‐Christine; Tédenac, J. C.

doi:10.1016/s0925-8388(02)00398-5

Cited by 52 publications

(33 citation statements)

References 9 publications

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“…This also reduces the stable Zn-deficient Zn 4 Sb 3 composition range predicted in the absence of Zn 8 Sb 7 (dashed line in Figure 5). Other unidentified phases as reported in some phase diagrams 22 could have a similar effect.…”

Section: Resultssupporting

confidence: 60%

Entropic stabilization and retrograde solubility in Zn4Sb3

et al. 2011

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Zn4Sb3 is shown to be entropically stabilized versus decomposition to Zn and ZnSb though the effects of configurational disorder and phonon free energy. Single phase stability is predicted for a range of compositions and temperatures. Retrograde solubility of Zn is predicted on the two-phase boundary region between Zn4Sb3 and Zn. The complex temperature dependent solubility can be used to explain the variety of nanoparticle formation observed in the system: formation of ZnSb on the Sb rich side, Zn on the far Zn rich side and nano-void formation due to Zn precipitates being reabsorbed at lower temperatures.

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Section: Resultssupporting

confidence: 60%

Entropic stabilization and retrograde solubility in Zn4Sb3

et al. 2011

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“…10) Finely grained powder metallurgical processes such as mechanical alloying (MA) and mechanical grinding (MG) have been used to obtain homogeneous materials. [11][12][13][14] In general, fine grain size materials have lower thermal conductivity than single crystals of the same materials because phonons can be scattered at grain boundaries. However, a single phase -Zn 4 Sb 3 has not been obtained by MA.…”

Section: Introductionmentioning

confidence: 99%

“…However, a single phase -Zn 4 Sb 3 has not been obtained by MA. [11][12][13] It was reported that relatively ductile Zn is more preferable to cold welding on to balls and vessels than pulverizing, resulting in Zn deficiency. 11) In this study, MG was applied to the preparation of single phase -Zn 4 Sb 3 by three different heat treatment processes.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Single Phase β-Zn<SUB>4</SUB>Sb<SUB>3</SUB> Thermoelectric Materials by Mechanical Grinding Process

2010

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Single phase -Zn 4 Sb 3 was prepared by mechanical grinding (MG). Source materials for the Zn 4 Sb 3 ingots were prepared using three different processes after the direct melting of constituent elements. The ingot was obtained by quenching the melt in water within an evacuated quartz ampoule and heat-treated for a total of 200 h in two stages at 723 K and 673 K. The resultant ingots were mechanically ground and sintered at 623 K by hot pressing. The sintered materials were obtained crack-free single phase -Zn 4 Sb 3 and characterized by X-ray diffraction, differential thermal analysis (DTA) and thermoelectric property measurements. The thermal conductivity of the sintered materials was 0.88 Wm À1 K À1 at room temperature and this was slightly lower than that reported for the materials prepared by a conventional method. Results indicate that the -Zn 4 Sb 3 single phase of the dimensionless figure of merit ranged from 1.06-1.31 at 573 K.

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“…These new materials exhibit higher ZT values at high temperature ranges. Generally, Zn 4 Sb 3 can be prepared in several ways: consolidation of powders either prepared by crushing ingots made by vacuum melting [16,17] or mechanical alloying methods [18], bulk mechanical alloying (BMA) followed by hot pressing [19]. The high defect densities in mechanically alloyed powders are expected to reduce the material's lattice thermal conductivity, thus improving the efficiency of thermoelectric conversion [20].…”

Section: Introductionmentioning

confidence: 99%

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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Mechanical alloying of a new promising thermoelectric material, Sb3Zn4

Cited by 52 publications

References 9 publications

Entropic stabilization and retrograde solubility in Zn4Sb3

Entropic stabilization and retrograde solubility in Zn4Sb3

Preparation of Single Phase β-Zn<SUB>4</SUB>Sb<SUB>3</SUB> Thermoelectric Materials by Mechanical Grinding Process

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

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Mechanical alloying of a new promising thermoelectric material, Sb3Zn4

Cited by 52 publications

References 9 publications

Entropic stabilization and retrograde solubility in Zn4Sb3

Entropic stabilization and retrograde solubility in Zn4Sb3

Preparation of Single Phase &beta;-Zn<SUB>4</SUB>Sb<SUB>3</SUB> Thermoelectric Materials by Mechanical Grinding Process

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

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Preparation of Single Phase β-Zn<SUB>4</SUB>Sb<SUB>3</SUB> Thermoelectric Materials by Mechanical Grinding Process