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Special Issue "Half-Heusler, Silicide and Zintl-type Thermoelectric Materials"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 1 May 2018

Special Issue Editor

Guest Editor
Dr. Jan-Willem Bos

Heriot-Watt University
Website | E-Mail
Interests: thermoelectric materials; structural chemistry

Special Issue Information

Dear Colleagues,

Thermoelectric generators are widely considered to become an important component of a sustainable energy future with many opportunities to harvest waste heat. These include stationary sources, such as in power plants and cement works, but also mobile applications including waste heat recovery from exhaust gasses in transportation. There has been an enormous improvement in thermoelectric materials performance over the past two to three decades and peak ZT > 1 is now routinely possible.

Amongst the materials investigated for waste heat recovery, compositions based on abundant elements with facile processing routes are of great interest. It is here where inorganic materials including the half-Heuslers, magnesium and higher manganese silicides and Zintl phases offer a possible competitive advantage over other leading materials, in particular over compounds containing lead and tellurium.

The aim of this Special Issue is to bring together the latest trends in research on half-Heuslers, silicides and Zintl phases. This covers materials synthesis and characterization but also includes work on important materials issues, such as high-temperature stability, electrical and thermal contacting and the fabrication of modules exploiting these materials.

The dual focus of this Special Issue is intentional as it is vital that materials exploration and the incorporation of materials in modules are addressed in parallel so that thermoelectric power generation can become a mainstream component of a sustainable energy future.

It is my pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Dr. Jan-Willem Bos
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Thermoelectric Materials
  • Module Fabrication
  • Half-Heuslers
  • Silicides
  • Zintl compounds

Published Papers (2 papers)

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Research

Open AccessArticle Impact of Interstitial Ni on the Thermoelectric Properties of the Half-Heusler TiNiSn
Materials 2018, 11(4), 536; doi:10.3390/ma11040536
Received: 13 March 2018 / Revised: 27 March 2018 / Accepted: 28 March 2018 / Published: 30 March 2018
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Abstract
TiNiSn is an intensively studied half-Heusler alloy that shows great potential for waste heat recovery. Here, we report on the structures and thermoelectric properties of a series of metal-rich TiNi1+ySn compositions prepared via solid-state reactions and hot pressing. A general relation
[...] Read more.
TiNiSn is an intensively studied half-Heusler alloy that shows great potential for waste heat recovery. Here, we report on the structures and thermoelectric properties of a series of metal-rich TiNi1+ySn compositions prepared via solid-state reactions and hot pressing. A general relation between the amount of interstitial Ni and lattice parameter is determined from neutron powder diffraction. High-resolution synchrotron X-ray powder diffraction reveals the occurrence of strain broadening upon hot pressing, which is attributed to the metastable arrangement of interstitial Ni. Hall measurements confirm that interstitial Ni causes weak n-type doping and a reduction in carrier mobility, which limits the power factor to 2.5–3 mW m−1 K−2 for these samples. The thermal conductivity was modelled within the Callaway approximation and is quantitively linked to the amount of interstitial Ni, resulting in a predicted value of 12.7 W m−1 K−1 at 323 K for stoichiometric TiNiSn. Interstitial Ni leads to a reduction of the thermal band gap and moves the peak ZT = 0.4 to lower temperatures, thus offering the possibility to engineer a broad ZT plateau. This work adds further insight into the impact of small amounts of interstitial Ni on the thermal and electrical transport of TiNiSn. Full article
(This article belongs to the Special Issue Half-Heusler, Silicide and Zintl-type Thermoelectric Materials)
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Open AccessArticle Effect of C and N Addition on Thermoelectric Properties of TiNiSn Half-Heusler Compounds
Materials 2018, 11(2), 262; doi:10.3390/ma11020262
Received: 19 January 2018 / Revised: 1 February 2018 / Accepted: 7 February 2018 / Published: 8 February 2018
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Abstract
We investigated the thermoelectric properties of the ternary half-Heusler compound, TiNiSn, when introducing C and N. The addition of C or N to TiNiSn leads to an enhanced power factor and a decreasing lattice thermal conductivity by point defect phonon scattering. The thermoelectric
[...] Read more.
We investigated the thermoelectric properties of the ternary half-Heusler compound, TiNiSn, when introducing C and N. The addition of C or N to TiNiSn leads to an enhanced power factor and a decreasing lattice thermal conductivity by point defect phonon scattering. The thermoelectric performances of TiNiSn alloys are significantly improved by adding 1 at. % TiN, TiC, and figure of merit (ZT) values of 0.43 and 0.34, respectively, can be obtained at 723 K. This increase in thermoelectric performance is very helpful in the commercialization of thermoelectric power generation in the mid-temperature range. Full article
(This article belongs to the Special Issue Half-Heusler, Silicide and Zintl-type Thermoelectric Materials)
Figures

Figure 1

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