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Title: Phase stability and property evolution of biphasic Ti–Ni–Sn alloys for use in thermoelectric applications

Abstract

Thermoelectric properties and phase evolution have been studied in biphasic Ti–Ni–Sn materials containing full-Heusler TiNi2Sn embedded within half-Heusler thermoelectric TiNiSn. Materials, prepared by levitation induction melting followed by annealing, were of the nominal starting composition of TiNi1+xSn, with x between 0.00 and 0.25. Phases and microstructure were determined using synchrotron X-ray diffraction and optical and electron microscopy. The full-Heusler phase is observed to be semi-coherent with the half-Heusler majority phase. Differential thermal analysis was performed to determine melting temperatures of the end-member compounds. The thermal conductivity is reduced with the introduction of a dispersed, full-Heusler phase within the half-Heusler material. This leads to an increased thermoelectric figure of merit, ZT, from 0.35 for the stoichiometric compound to 0.44 for TiNi1.15Sn. Beyond x = 0.15 ZT decreases due to a rise in thermal conductivity. Density functional theory calculations using hybrid functionals were performed to determine band alignments between the half- and full-Heusler compounds, as well as comparative energies of formation. Finally, the hybrid functional band structure of TiNiSn is presented as well.

Authors:
 [1];  [1];  [2];  [2];  [1];  [1];  [1];  [1]
  1. Univ. of California, Santa Barbara, CA (United States). Materials Research Lab.
  2. Univ. of California, Santa Barbara, CA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Energy Efficient Materials (CEEM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1383610
Grant/Contract Number:  
SC0001009; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 4; Related Information: CEEM partners with the University of California, Santa Barbara (lead); Purdue University; Los Alamos National Laboratory; National Renewable Energy Laboratory; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; solar (photovoltaic); solid state lighting; phonons; thermoelectric; bio-inspired; energy storage (including batteries and capacitors); electrodes - solar; defects; charge transport; materials and chemistry by design; optics; synthesis (novel materials); synthesis (self-assembly); synthesis (scalable processing)

Citation Formats

Douglas, Jason E., Birkel, Christina S., Verma, Nisha, Miller, Victoria M., Miao, Mao-Sheng, Stucky, Galen D., Pollock, Tresa M., and Seshadri, Ram. Phase stability and property evolution of biphasic Ti–Ni–Sn alloys for use in thermoelectric applications. United States: N. p., 2014. Web. doi:10.1063/1.4862955.
Douglas, Jason E., Birkel, Christina S., Verma, Nisha, Miller, Victoria M., Miao, Mao-Sheng, Stucky, Galen D., Pollock, Tresa M., & Seshadri, Ram. Phase stability and property evolution of biphasic Ti–Ni–Sn alloys for use in thermoelectric applications. United States. https://doi.org/10.1063/1.4862955
Douglas, Jason E., Birkel, Christina S., Verma, Nisha, Miller, Victoria M., Miao, Mao-Sheng, Stucky, Galen D., Pollock, Tresa M., and Seshadri, Ram. Tue . "Phase stability and property evolution of biphasic Ti–Ni–Sn alloys for use in thermoelectric applications". United States. https://doi.org/10.1063/1.4862955. https://www.osti.gov/servlets/purl/1383610.
@article{osti_1383610,
title = {Phase stability and property evolution of biphasic Ti–Ni–Sn alloys for use in thermoelectric applications},
author = {Douglas, Jason E. and Birkel, Christina S. and Verma, Nisha and Miller, Victoria M. and Miao, Mao-Sheng and Stucky, Galen D. and Pollock, Tresa M. and Seshadri, Ram},
abstractNote = {Thermoelectric properties and phase evolution have been studied in biphasic Ti–Ni–Sn materials containing full-Heusler TiNi2Sn embedded within half-Heusler thermoelectric TiNiSn. Materials, prepared by levitation induction melting followed by annealing, were of the nominal starting composition of TiNi1+xSn, with x between 0.00 and 0.25. Phases and microstructure were determined using synchrotron X-ray diffraction and optical and electron microscopy. The full-Heusler phase is observed to be semi-coherent with the half-Heusler majority phase. Differential thermal analysis was performed to determine melting temperatures of the end-member compounds. The thermal conductivity is reduced with the introduction of a dispersed, full-Heusler phase within the half-Heusler material. This leads to an increased thermoelectric figure of merit, ZT, from 0.35 for the stoichiometric compound to 0.44 for TiNi1.15Sn. Beyond x = 0.15 ZT decreases due to a rise in thermal conductivity. Density functional theory calculations using hybrid functionals were performed to determine band alignments between the half- and full-Heusler compounds, as well as comparative energies of formation. Finally, the hybrid functional band structure of TiNiSn is presented as well.},
doi = {10.1063/1.4862955},
journal = {Journal of Applied Physics},
number = 4,
volume = 115,
place = {United States},
year = {Tue Jan 28 00:00:00 EST 2014},
month = {Tue Jan 28 00:00:00 EST 2014}
}

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