Compositional tailoring for realizing high thermoelectric performance in Hafnium free n-type ZrNiSn half-heusler alloys.

Clicks: 211
ID: 14411
2019
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Emerging

Ranked #392 of 899 articles by views in ACS applied materials & interfaces

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 899 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
Compositional tailoring enables fine tuning of thermoelectric (TE) transport parameters by synergistic modulation of electronic and vibrational properties. In the present work, aspects of compositionally tailored defects have been explored in ZrNiSn based Half-Heusler (HH) TE material, to achieve high thermoelectric performance and cost effectiveness in n-type Hf-free HH alloys. In off-stoichiometric Ni-rich ZrNi1+xSn alloys in low Ni-doping limit (x<0.1), excess Ni induces defects (Ni-Vacancy antisite + Interstitials), which tends to cause band structure modification. In addition, structural similarity of HH and full-Heusler (FH) compounds and formation energetics lead to intrinsic phase segregation of FH nano-scale precipitates that are coherently dispersed within the ZrNiSn HH matrix as nanoclusters. A consonance was achieved experimentally between these two competing mechanisms for optimal HH composition having both FH precipitates and Ni/Vacancy antisite defects in the HH matrix by elevating the sintering temperature up to the solubility limit range of the ZrNiSn system. Defect-mediated optimization of electrical and thermal transport via carrier concentration tuning, energy filtering, and possibly all scale-hierarchical architecture, resulted in a maximum ZT ~1.1 at 873K for the optimized ZrNi1.03Sn composition. Our findings highlight a realistic prospect of enhancing thermoelectric performance via compositional engineering approach for wide applications of thermoelectrics.
Reference Key
chauhan2019compositionalacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Chauhan, Nagendra Singh;Bathula, Sivaiah;Gahtori, Bhasker;Mahanti, Subhendra D Bhanu;Bhattacharya, Amrita;Vishwakarma, Avinash;Bhardwaj, Ruchi;Dhar, Ajay;
Journal ACS applied materials & interfaces
Year 2019
DOI
10.1021/acsami.9b12599
URL
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.