Sr/Eu cation doping and thermoelectric properties of the compound Ca&amp;lt;sub&amp;gt;9&amp;lt;/sub&amp;gt;Zn&amp;lt;sub&amp;gt;4.5&amp;lt;/sub&amp;gt;&amp;lt;sub&amp;gt;&amp;minus;&amp;lt;/sub&amp;gt;&amp;lt;sub&amp;gt;&amp;lt;italic&amp;gt;&amp;delta;&amp;lt;/italic&amp;gt;&amp;lt;/sub&amp;gt;Sb&amp;lt;sub&amp;gt;9&amp;lt;/sub&amp;gt; (0&amp;lt;&amp;lt;italic&amp;gt;&amp;delta;&amp;lt;/italic&amp;gt;&amp;lt;0.5)

Zhang, Jian; Wu, Zezhou; Xia, Sheng‐Qing

doi:10.1360/n972018-01178

Cited by 2 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…20 In Sr-doped Ca 9 Zn 4+x Sb 9 series, increased concentration of interstitial Zn atoms and thereby improved carrier mobility were found due to the expanded anionic framework. 21 By substituting the rare-earth elements on CaAgSb, interesting phase transition from TiNiSi type to LiGaGe type occurred, alongside the optimized electronic bands and improved TE performance. 22 It is reported that the introduction of the smaller Li on the Ca site in Ca(Zn 0.4 Ag 0.2 ) Sb led to the shrinkage of interlayered distances and the optimized orbital alignment, accompanied by a high zT value of 1.3.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Ca 9 Mn 4+ x Sb 9 was reported to crystallize in the Pnma space group, while the inclusions of rare-earth elements at Ca sites resulted in a derivative of Ca 9 Mn 4 Bi 9 ( Pbam ) with a tetrahedron-coordinated Mn splitting . In Sr-doped Ca 9 Zn 4+ x Sb 9 series, increased concentration of interstitial Zn atoms and thereby improved carrier mobility were found due to the expanded anionic framework . By substituting the rare-earth elements on CaAgSb, interesting phase transition from TiNiSi type to LiGaGe type occurred, alongside the optimized electronic bands and improved TE performance .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cation Substitution and Size Effects in Ca₂ZnSb₂ and Yb₂MnSb₂: Crystal and Electronic Structures and Thermoelectric Properties

Liu

Wang

et al. 2023

Inorg. Chem.

View full text Add to dashboard Cite

Zintl compounds often feature complex structural fragments and small band gaps, favoring promising thermoelectric properties. In this work, a new phase Ca 2 ZnSb 2 is synthesized and characterized to be a LiGaGe-type structure. It is isotypic to Yb 2 MnSb 2 with half vacancies at transition metal sites and undergoes a phase transition to Ca 9 Zn 4+x Sb 9 after annealing. Interestingly, Ca 2 ZnSb 2 and Yb 2 MnSb 2 are amenable to diverse doping mechanisms at different sites. Here, by substituting smaller Li on cation sites, two novel layered compounds Ca 1.84(1) Li 0.16(1) Zn 0.84(1) Sb 2 and Yb 1.82(1) Li 0.18(1) Mn 0.96(1) Sb 2 with the P6 3 /mmc space group are discovered, which can be viewed as derivatives of LiGaGe type. Despite having lower occupancy, the structural stability is improved compared with the prototype compounds owing to the reduced interlayered distances. Besides, the band structure analyses demonstrate that the bands near the Fermi level are mainly governed by the interlayered interaction. Due to the highly disordered structure, Yb 1.82 Li 0.18 Mn 0.96 Sb 2 features ultralow thermal conductivity from 0.79 to 0.47 W•m −1 •K −1 among the testing range; in addition, a remarkable Seebeck coefficient of 270.77 μV•K −1 at 723 K is observed. The discovery of the Ca 2 ZnSb 2 phase enriches the 2-1-2 map, and the size effect induced by cations provides new ideas for material designing.

show abstract

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cation Substitution and Size Effects in Ca₂ZnSb₂ and Yb₂MnSb₂: Crystal and Electronic Structures and Thermoelectric Properties

Liu

Wang

et al. 2023

Inorg. Chem.

View full text Add to dashboard Cite

show abstract

Enhanced Thermoelectric Performance of Zintl Phase Ca₉Zn_4+xSb₉ by Beneficial Disorder on the Selective Cationic Site

Chen

Xue

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Zintl phase compounds Ca 9 Zn 4+x Sb 9 have promising thermoelectric properties due to their complex crystal structure and tunable interstitial Zn. In this work, we prepared nominal Ca 9 Zn 4+x Sb 9 (x = 0.5, 0.6, 0.7, and 0.8) using ball milling and hot pressing. Further decreased lattice thermal conductivity was obtained by isoelectronic substitution of Eu on the selective Ca site, which is farther away from the framework of [Zn 4+x Sb 9 ] δ− for the smaller disturbance of carrier transport. Together with the intensively enhanced carrier mobility, which is attributed to the decreased effective mass and the increased interstitial Zn by inclusion of Eu, an increased peak ZT value to ∼1.05 at 773 K and an enhanced average ZT value to ∼0.73 from 300 to 823 K were achieved in Ca 6.75 Eu 2.25 Zn 4.7 Sb 9 .

show abstract

Sr/Eu cation doping and thermoelectric properties of the compound Ca<sub>9</sub>Zn<sub>4.5</sub><sub>−</sub><sub><italic>δ</italic></sub>Sb<sub>9</sub> (0<<italic>δ</italic><0.5)

Cited by 2 publications

References 8 publications

Cation Substitution and Size Effects in Ca₂ZnSb₂ and Yb₂MnSb₂: Crystal and Electronic Structures and Thermoelectric Properties

Cation Substitution and Size Effects in Ca₂ZnSb₂ and Yb₂MnSb₂: Crystal and Electronic Structures and Thermoelectric Properties

Enhanced Thermoelectric Performance of Zintl Phase Ca₉Zn_4+xSb₉ by Beneficial Disorder on the Selective Cationic Site

Contact Info

Product

Resources

About

Sr/Eu cation doping and thermoelectric properties of the compound Ca&lt;sub&gt;9&lt;/sub&gt;Zn&lt;sub&gt;4.5&lt;/sub&gt;&lt;sub&gt;&minus;&lt;/sub&gt;&lt;sub&gt;&lt;italic&gt;&delta;&lt;/italic&gt;&lt;/sub&gt;Sb&lt;sub&gt;9&lt;/sub&gt; (0&lt;&lt;italic&gt;&delta;&lt;/italic&gt;&lt;0.5)

Cited by 2 publications

References 8 publications

Cation Substitution and Size Effects in Ca2ZnSb2 and Yb2MnSb2: Crystal and Electronic Structures and Thermoelectric Properties

Cation Substitution and Size Effects in Ca2ZnSb2 and Yb2MnSb2: Crystal and Electronic Structures and Thermoelectric Properties

Enhanced Thermoelectric Performance of Zintl Phase Ca9Zn4+xSb9 by Beneficial Disorder on the Selective Cationic Site

Contact Info

Product

Resources

About

Sr/Eu cation doping and thermoelectric properties of the compound Ca<sub>9</sub>Zn<sub>4.5</sub><sub>−</sub><sub><italic>δ</italic></sub>Sb<sub>9</sub> (0<<italic>δ</italic><0.5)

Cation Substitution and Size Effects in Ca₂ZnSb₂ and Yb₂MnSb₂: Crystal and Electronic Structures and Thermoelectric Properties

Cation Substitution and Size Effects in Ca₂ZnSb₂ and Yb₂MnSb₂: Crystal and Electronic Structures and Thermoelectric Properties

Enhanced Thermoelectric Performance of Zintl Phase Ca₉Zn_4+xSb₉ by Beneficial Disorder on the Selective Cationic Site