Assoc. Prof. Yaron Amouyal

Group Leader

B.A. 2001, Physics (Technion)
B.Sc. 2001, Materials Engineering (Technion)
M.Sc. 2003, Materials Engineering (Technion)

De-Jur bldg. room 605,
Tel: +972-77-8871915
Fax: +972-4-8295677
amouyal@technion.ac.il

Google Scholar profile

Yaron Amouyal is an Associate Professor at the Department of Materials Science and Engineering, Technion – Israel Institute of Technology. Upon graduating from the Technion (Ph.D., 2007), he joined the Department of Materials Science and Engineering at Northwestern University (Evanston IL, USA) as a Marie Curie Research Associate in the framework of the International Outgoing Fellowship (IOF) program of the European Union. After a reintegration period as a senior researcher at the Technion Research and Development Foundation (TRDF), he joined the Materials Science and Engineering Department, Technion – Israel Institute of Technology, as a faculty member, and since 2011 he has been leading a dynamic group specializing in experimental and computational aspects of materials design for tailoring thermal and electronic transport properties of thermoelectric materials.

Research

  • Thermoelectric materials;
  • Atom-probe tomography (APT);
  • Computational materials science based on the density functional theory (DFT);
  • Diffusion and mass transport in solids and short-circuit diffusion;
  • Phase transformations in materials;
  • Energetics of interfaces in crystalline solids.

One of the fundamental and intriguing questions in materials science is how to control functional properties of materials by manipulating their microstructure. An outstanding example for a functional property that is highly sensitive to the finest features of microstructure is thermoelectricity. In the thermoelectric (TE) effect thermal energy is converted into electrical energy and vice-versa. TE devices can, therefore, serve for heat-exchange or refrigerating as well as for capturing waste heat and converting it into electricity; the latter has major implications for energy harvesting.

The performance of TE materials can be improved by increasing their electrical conductivity and/or reducing their thermal conductivity. These two requirements are usually contradictory, which makes the development of TE materials a grand challenge from the materials science point of view. One of the promising approaches for reducing thermal conductivity with no deterioration of the electrical conductivity is formation of coherent nanometer- size precipitates dispersed in a TE matrix, thereby scattering of heat conducting phonons.

We process two-phase TE alloys comprising matrix and precipitates, and apply different heat treatments to obtain diverse microstructures. Supplemented by ab-initio calculations, we aim to “smartly-design” new materials processing in a time and cost-effective manner. Employing advanced characterization techniques, we analyze the materials structure and chemistry down to the nanometer length-scale. Finally, we measure the TE properties of these materials and correlate them with their microstructures. This helps us modeling the thermal conductivity in heterogeneous materials, and provides us with insight of the underlying physics. Besides possible improvements of TE properties, we endeavor to advance our understanding of how functional properties of materials depend on their microstructure.

Selected publications

2020

  • M. H. Dahan, A. Baranovskiy, Y. Natanzon, Y. Amouyal. A first-principles study of the temperature-dependent diffusion coefficients of silver in the thermoelectric compound PbTe. Acta Materialia 202, 243-254 (2020)
  • A. Azulay, M. Wahabi, Y. Natanzon, Y. Kauffman, Y. Amouyal: Enhanced Charge Transport in Ca2MnO4-Layered Perovskites by Point Defect Engineering. ACS Appl. Mater. Interfaces 12, 49768–49776 (2020)
  • Yuriy Natanzon, Amram Azulay, and Yaron Amouyal: Evaluation of polaron transport in solids from first-principles. A Review in the Israel Journal of Chemistry 60 (2020)

2019

  • Chhatrasal Gayner and Yaron Amouyal: Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials. A Progress Report; The Technion Global Special Issue of Advanced Functional Materials, 1901789 (2019) DOI: 10.1002/adfm.201901789
  • Lamya Abdellaoui, Siyuan Zhang, Stefan Zaefferer, Ruben Bueno-Villoro, Andrei Baranovskiy, Oana Cojocaru-Mirédin, Yuan Yu, Yaron Amouyal, Dierk Raabe, Gerald Jeffrey Snyder: Density, Distribution and Nature of Planar Faults in Silver Antimony Telluride for Thermoelectric Applications. Acta Mater. 178, 135-145 (2019).
  • Adam K. Budniak, Niall A. Killilea, Szymon J. Zelewski, Mykhailo Sytnyk, Yaron Kauffmann, Yaron Amouyal, Robert Kudrawiec, Wolfgang Heiss, and Efrat Lifshitz: Two-dimensional CrPS4 with promising photoconductivity. Small, 1905924 (2019).
  • Arthur Shapiro, Markus W. Heindl, Faris Horani, Meir-Haim Dahan, Yaron Amouyal, and Efrat Lifshitz: Significance of Ni Doping in CsPbX3 Nanocrystals via Post-synthesis Cation–Anion Coexchange. The Journal of Physical Chemistry C. 123, 24979 (2019). DOI: 10.1021/acs.jpcc.9b08317
  • Rimma Lapovok, Yaron Amouyal, Yuanshen Qi, Alex Berner, Anna Kosinova, Eugene Lakin, Dmitri A. Molodov, and Emil Zolotoyabko: Enhancement of electrical conductivity in aluminum single crystals by boron treatment in solid state. Journal of Materials Science, in-press (2019). DOI: 10.1007/s10853-019-04070-x
  • Andrei Baranovskiy, Mor Harush, and Yaron Amouyal: On the influence of rare earth dopants on thermal transport in thermoelectric Bi2Te3 compounds: an ab-initio perspective. Advanced Theory and Simulations1 (12), 1800162 (2019).
  • Amram Azulay and Yaron Amouyal: Tailoring electronic and thermal transport properties of CaO(CaMnO3)m-based (m=1 and m=∞) composites for thermoelectric power generation, Acta Materialia 164 481-492 (2019).

2018

  • Ariel Sheskin, Torsten Schwarz, Yuan Yu, Siyuan Zhang, Lamya Abdellaoui, Baptiste Gault, Oana Cojocaru-Mirédin, Christina Scheu, Dierk Raabe, Matthias Wuttig, and Yaron Amouyal: Tailoring thermoelectric transport properties of Ag-alloyed PbTe: effects of microstructure evolution. ACS Applied Materials & Interfaces10 (45) 38994-39001 (2018).
  • Song, Erdong; Baranovskiy, Andrei; Xu, Enzhi; Busani, Tito; Swartzentruber, Brian; Zhang, Shixiong; Amouyal, Yaron; Martinez, Julio: Manipulating thermal and electronic transports in thermoelectric Bi2Te3 nanowires by porphyrin adsorption. AIP Advances 8, 105010 (2018) – Editor’s Pick.
  • Y. Amouyal, Y. Gelbstein, D. Fuks, Progress Report: Physical Metallurgy Inspired Nano-Features for Enhancement of Thermoelectric Conversion Efficiency,Advanced Theory and Simulations July 2018, 1800072. https://doi.org/10.1002/adts.201800072
  • Andrei Baranovskiy, Ido Koresh, and Yaron Amouyal: Tuning Transport Properties of Nickel-Doped Zinc Oxide for Thermoelectric Applications. MRS CommunicationsMay 2018, pp. 1-7.
  • Y. Yu, S. Zhang, A. M. Mio, B. Gault, A. Sheskin, C. Scheu, D. Raabe, F.-Q. Zu, M. Wuttig, Y. Amouyal and O. Cojocaru-Miredin: Ag-segregation to dislocations in PbTe-based thermoelectric materials. ACS Applied Materials & Interfaces10 (4), 3609 (2018).
  • A. Baranovskiy, A. Graff, J. Klose, J. Mayer, and Y. Amouyal: On the origin of vibrational properties of calcium manganate based thermoelectric compounds. Nano Energy  47 451-462 (2018).

2017

  • T. Grossfeld, A. Sheskin, Y. Gelbstein, and Y. Amouyal: Microstructure Evolution of Ag-Alloyed PbTe-Based Compounds and Implications for Thermoelectric Performance,  Crystals 7 (9), 281 (2017) http://www.mdpi.com/2073-4352/7/9/281
  • I. Koresh and Y. Amouyal: Effects of precipitation on the thermal conductivity of nickel-doped zinc oxide for thermoelectric applications. J. Eur. Ceram. Soc. 37 (11), 3541-3550 (2017)
  • Oana Cojocaru-Miredin, Lamya Abdellaoui, Michael Nagli, Siyuan Zang, Yuan Yu, Christina Scheu, Dierk Raabe, Matthias Wuttig and Yaron Amouyal: Role of nanostructuring in silver antimony telluride compounds for thermoelectric applications. ACS Appl. Mater. Int. 9 (17), 14779-14790 (2017).
  • L. Popilevsky, V.M. Skripnyuk, Y. Amouyal, E. Rabkin, Tuning the thermal conductivity of hydrogenated porous magnesium hydride composites with the aid of carbonaceous additives. International Journal of Hydrogen Energy 42, 22395-22405 (2017).
  • Y. Amouyal:  A Practical Approach to Evaluate Lattice Thermal Conductivity in Two-Phase Thermoelectric Alloys for Energy Applications.Materials 10 (4), 386 (2017).
  • A. Baranovskiy and Y. Amouyal: Dependence of electrical transport properties of CaO(CaMnO3)m (m = 1, 2, 3, ∞) thermoelectric oxides on lattice periodicity. J Appl. Phys. 121, 065103 (2017).
  • A. Castellero, G. Fiore, E. Evenstein, M. Baricco, Y. Amouyal: Effects of Rapid Solidification on Phase Formation and Microstructure Evolution of AgSbTe2-Based Thermoelectric Compounds. J. Nanosci. Nanotech. 17 (3), 1650 (2017).
  • Y. Amouyal: Silver-antimony-telluride: from first-principles calculations to thermoelectric applications (Chapter 7, p. 149) In: Thermoelectric Power Generation – Advanced Materials and Devices, a book edited by Sergey Skipidarov and Mikhail Nikitin, ISBN 978-953-51-2846-5, Print ISBN 978-953-51-2845-8; Open access: http://dx.doi.org/10.5772/66086

 

2016

  • Shekhter, D. Schwendt, Y. Amouyal, T. F. Wietler, H. J. Osten, and M. Eizenberg: Strain-induced phase variation and dielectric constant enhancement of epitaxial Gd2O3J. Appl. Phys. 120 (1), 014101 (2016).
  • Baranovskiy and Y. Amouyal: Structural stability of calcium-manganate based CaO(CaMnO3)m (m = 1, 2, 3, ∞) compounds for thermoelectric applications, Journal of Alloys and Compounds 687, 562 (2016).
  • Popilevsky, V. M. Skripnyuk, M. Beregovsky, M. Sezen, Y. Amouyal, and E. Rabkin: Hydrogen storage and thermal transport properties of pelletized porous Mg-2 wt.% multiwall carbon nanotubes and Mg-2 wt.% graphite composites, International Journal of Hydrogen Energy 41 (32), 14461 (2016).
  • Shekhter, C. Uzan-Saguy, J. Schubert, Y. Amouyal, and M. Eizenberg: Experimental and computational study of zero dimensional metallic behavior at the LaLuO3/SrTiO3 interface, J. Vac. Sci. Tech. B 34 (2), 021204 (2016).
  • Amouyal and G. Schmitz: Atom probe tomography—A cornerstone in materials characterization. MRS Bulletin 41 (01), 13 (2016).
  • Graff and Y. Amouyal: Effects of Lattice Defects and Niobium Doping on Thermoelectric Properties of Calcium Manganate Compounds for Energy Harvesting Applications. Elect. Mater. 45 (3), 1508 (2016).
  • Amram, Y. Amouyal, and E. Rabkin: Encapsulation by segregation – a multifaceted approach to gold segregation in iron particles on sapphire. Acta Mater. 102 342 (2016).

 

2015

  • Joseph and Y. Amouyal: Enhancing thermoelectric performance of PbTe-based compounds by substituting elements: a first-principles study. J. Elect. Mater. 44 (6), 1460 (2015).
  • Joseph and Y. Amouyal: Towards a predictive route for selection of doping elements for the thermoelectric compound PbTe from first-principles. J. Appl. Phys. 117 (17), 175102 (2015).

 

2014

  • Amouyal: Reducing Lattice Thermal Conductivity of the Thermoelectric Compound AgSbTe2 (P4/mmm) by Lanthanum Substitution: Computational and Experimental Approaches. J. Elect. Mater. 43 (10), 3772 (2014).
  • Amouyal, Z. Mao, and D. N. Seidman: Combined atom- probe tomography and first-principles calculations for studying atomistic interactions between tungsten and tantalum in nickel-based alloys. Acta Mater. 74, 296 (2014).
  • Graff and Y. Amouyal: Reduced thermal conductivity in niobium-doped calcium-manganate compounds for thermoelectric applications. Appl. Phys. Lett. 105 (18), 181906 (2014).

 

2013

  • Amouyal: On the role of lanthanum substitution defects in reducing lattice thermal conductivity of the AgSbTe2 (P4/mmm) thermoelectric compound for energy conversion applications. Comp. Mater. Sci. 78, 98 (2013).
  • Ribbe, G. Schmitz, D. Gunderov, Y. Estrin, Y. Amouyal, G. Wilde, S.V. Divinski: Effect of annealing on percolating porosity in ultrafine-grained copper produced by equal channel angular pressing. Acta Mater. 61, 5477 (2013).

 

2012

  • Amouyal and D. N. Seidman: Atom-Probe Tomography of Nickel-based Superalloys with Green or Ultraviolet Lasers: A Comparative Study. Microscopy and Microanalysis 18 (5), 971 (2012).
  • A. Rothschild, A. Cohen, A. Brusilovsky, L. Kornblum, Y. Kauffmann, Y. Amouyal, and M. Eizenberg: Fermi level tuning using the Hf-Ni alloy system as a gate electrode in metal-oxide-semiconductor devices. J. Appl. Phys. 112 (1), 013717 (2012).
  • Ashuach, Y. Kauffmann, D. Isheim, Y. Amouyal, D.N. Seidman, and E. Zolotoyabko: Atomic intermixing in short-period InAs/GaSb superlattices. Appl. Phys. Lett. 100 (24), 241604 (2012).
  • Kornblum, P. Shekhter, Y. Slovatizky, Y. Amouyal, and M. Eizenberg: Composition and crystallography dependence of the work function: Experiment and calculations of Pt-Al alloys. Phys. Rev. B 86 (12), 125305 (2012).

 

2011

  • Amouyal and D. N. Seidman: The role of hafnium in the formation of misoriented defects in Ni-based superalloys: An atom-probe tomographic study. Acta Mater. 59 (2011) pp 3321-3333.
  • Amouyal and D. N. Seidman: An atom-probe tomographic study of freckle formation in a nickel-based superalloy. Acta Mater. 59 (2011) pp 6729-6742.

 

2010

  • Amouyal, Z. Mao, and D. N. Seidman: Effects of tantalum on the partitioning of tungsten between the γ- and γ’- phases in nickel-based superalloys: Linking experimental and computational approaches. Acta Mater. 58 (2010) pp. 5898-5911.

2009

  • Amouyal, Z. Mao, C. Booth-Morrison, and D. N. Seidman: On the interplay between tungsten and tantalum atoms in Ni-based superalloys: An atom-probe tomographic and first-principles study. Appl. Phys. Lett. 94 (4), 041917 (2009).
  • Klinger, Y. Amouyal, S.V. Divinski, and E. Rabkin: Grain Boundary Diffusion in Recrystallizing Nanocrystalline Materials. Defect and Diffusion Forum Vols. 289-292 (2009) pp. 641-648.
  • Amouyal, Z. Mao, and D. N. Seidman: Phase partitioning and site-preference of hafnium in the γ'(L12)/γ(fcc) system in Ni-based superalloys: An atom-probe tomographic and first-principles study. Appl. Phys. Lett. 95 (16), 161909 (2009).

 

2008

  • Amouyal, S.V. Divinski, L. Klinger, E. Rabkin: Grain Boundary Diffusion and Recrystallization in Ultrafine Grain Copper produced by Equal Channel Angular Pressing. Acta Mater56 (2008) pp. 5500-5513.
  • Ribbe, G. Schmitz, Y. Amouyal, Y. Estrin, and S.V. Divinski: Grain boundary radiotracer diffusion of Ni in ultra-fine grained Cu and Cu—1wt.% Pb alloy produced by equal channel angular pressing. Materials Science Forum Vols. 584-586 (2008) pp. 380-386.
  • Amouyal, Z. Mao, D.N. Seidman: Segregation of tungsten at γ'(L12)/γ(f.c.c.) interfaces in a Ni-based superalloy: An atom-probe tomographic and first-principles study. Appl. Phys. Lett. 93 (20), 201905 (2008).

 

2007 and earlier

  • Rabkin, Y. Amouyal, L. Klinger: Scanning probe microscopy study of grain boundary migration in NiAl. Acta Mater. 52 (2004) pp. 4953-4959.
  • Rabkin, Y. Amouyal: Applications of scanning probe microscopy for studying of interfacial thermodynamics and kinetics. Arch. Met. Mat. 49 (2004) pp. 397-410.
  • Amouyal, E. Rabkin, Y. Mishin: Correlation between grain boundary energy and geometry in Ni-rich NiAl. Acta Mater53 (2005) pp. 3795-3805.
  • Amouyal, S.V. Divinski, Y. Estrin, E. Rabkin: Short-circuit Diffusion in an Ultrafine Grain Copper-Zirconium Alloy Produced by Equal Channel Angular Pressing. Acta Mater55 (2007) pp. 5968-5979.
  • Amouyal, E. Rabkin: A Scanning Force Microscopy Study of Grain Boundary Energy in Copper Subjected to Equal Channel Angular Pressing. Acta Mater55 (2007) pp. 6681-6689.

Teaching

  • “Advanced Topics in Materials Science – Transport Properties and Thermoelectric Materials (318124)” for graduate students.
  • “Advanced Students Laboratories (315002)” for undergraduate students (academic responsibility).
  • “Advanced Materials Selection (315012)” for undergraduate students.
  • “Thermodynamics of Materials (315003)” for undergraduate students.