Annuaire
Personnel de recherche CNRS
M. Guillaume Nataf
Chargé de recherche CNRSCoordonnées
- Tél
- 0254552166
- guillaume.nataf@univ-tours.fr
Discipline(s) enseignée(s)
Lecturer and demonstrator for master students in materials science (optics, Maxwell equations, Raman spectroscopy)
Demonstrator for undergraduate students in materials science (calorimetry, X-rays diffraction) and electronics
Demonstrator for undergraduate students in materials science (calorimetry, X-rays diffraction) and electronics
Thèmes de recherche
My research focuses on functional oxides (ferroelectrics and ferroelastics), whose outstanding properties result from a complex interaction between chemical compositions, crystallographic orientations and micro/nanostructures. I am particularly interested in micro/nanostructures (pores, domains, domain walls) and:
- the evolution of their structural properties across phase transitions,
- their response under constraint,
- the characterisation and understanding of their own functionalities,
- their role in thermal properties of materials.
Group members
Joachim Montoussé, PhD student (with the French company Soitec, co-supervised with Silvana Mercone, Kevin Nadaud, Micka Bah)
Vijaya Bhasker, PhD student (co-supervised with Fabien Giovannelli)
Anusri Anil, PhD student (co-supervised with Béatrice Negulescu, Jérôme Wolfman)
Wasim Akram, postdoc (co-supervised with Stefan Dilhaire)
Previous group members
Nassima Radouane, postdoc (now postdoc in Institut Néel)Lucile Féger, PhD student (best PhD Thesis prize from GDR NAME)
Khalid Ait Ali, master student
Yersultan Rymkul, master student
Rachid Belrhiti-Nejjar, master student (now PhD student at GREMAN)
Edgar Chaslin, master student (now PhD student at University of Rennes)
Mehdi El Kamily, master student (now outreach coordinator at Espace Mendès-France)
Activités / CV
Key Publications
- G. F. Nataf, S. Volz, J. Ordonez-Miranda, J. Íñiguez-González, R. Rurali, B. Dkhil. Using oxides to cumpute with heat. Nat. Rev. Mater. (2024) – doi: 10.1038/s41578-024-00690-1.
- P. Limelette, M. El Kamily, H. Aramberri, F. Giovannelli, M. Royo, R. Rurali, I. Monot-Laffez, J.Íñiguez, G. F. Nataf. Influence of ferroelastic domain walls on thermal conductivity. Phys. Rev. B 108, 144104 (2023) – doi: 10.1103/PhysRevB.108.144104
- G. F. Nataf, M. Guennou, J. M. Gregg, D. Meier, J. Hlinka, E. K. H. Salje, J. Kreisel. Domain-wall engineering and topological defects in ferroelectric and ferroelastic materials. Nature Reviews Physics 2, 634-648 (2020) – doi: 10.1038/s42254-020-0235-z
- G. F. Nataf, M. Guennou, J. Kreisel, P. Hicher, R. Haumont, O. Aktas, E. K. H. Salje, L. Tortech, C. Mathieu, D. Martinotti, N. Barrett. Control of surface potential at polar domain walls in a nonpolar oxide. Phys. Rev. Mater. 1, 74410 (2017) – doi: 10.1103/PhysRevMaterials.1.074410
- G. F. Nataf, P. O. Castillo-Villa, J. Baró, X. Illa, E. Vives, A. Planes, E. K. H. Salje. Avalanches in compressed porous SiO2-based materials. Phys. Rev. E 90, 022405 (2014) – doi: 10.1103/PhysRevE.90.022405
- E. K. H. Salje, M. Carpenter, G. F. Nataf, G. Picht, K. Webber, J. Weerasinghe, S. Lisenkov, L. Bellaiche. Elastic excitations in BaTiO3 single crystals and ceramics: Mobile domain boundaries and polar nanoregions observed by RUS. Phys. Rev. B 87, 014106 (2013) – doi: 10.1103/PhysRevB.87.01410
Invited talks
- Controlling thermal conductivity with ferroicdomain walls, FutureATRONICS. Trondheim, Norway, 2025.
- Influence of ferroicdomain walls on thermal conductivity. EMRS Fall Meeting. Warsaw, Poland, 2025.
- Using ferroelasticand ferroelectric domain wallsto control thermal conductivity. EMF. Katowice, Poland, 2025.
- Strategies to build ferroelectric thermal conductivity switches. ISAF. Graz, Austria, 2025.
- Tuning the thermal conductivity of barium titanate with an electric field. EMRS Spring Meeting. Strasbourg, France, 2025.
- Tuning the thermal conductivity with an electric field. Ferroics and Mutiferroics: Exploring Emergent Phenomena at Nano and Pico Scales. Le Mans, France, 2024.
- Avalanches of ferroelectric domain walls. Avalanche. Espoo, Finland, 2024.
- Ferroelectric and ferroelastic domain walls: interfaces to tune thermal conductivity. Energy transfer at interfaces. Paris, France, 2023.
- Domain-wall engineering in multiferroic materials. Annual meeting of the German Physical Society on Condensed Matter Physics. Regensburg, Germany, 2022.
- Avalanches in ferroelectric and ferroelastic materials. Avalanche dynamics and precursors of catastrophic events. Debrecen, Hungary, 2022.
- Multiferroic domain walls in ferroelastic materials. 9th International Advances in Applied Physics & Materials Science Congress & Exhibition. Ölüdeniz, Turkey, 2019.
- Towards giant barocaloric materials with low hysteresis. EMN Meeting on Caloric Materials. Lyon, France, 2018.
Invited lectures
- Ferroelectric domain walls: interfaces in extreme conditions. Summer school MATEX. Orléans, France, 2025.
- Raman spectroscopy. ELENAM: Metrology at the nanoscale. Fréjus, France, 2024.
- Solid-state synthesis. EL NANO thematic school. Aussois, France, 2023.
- High-pressure calorimetric methods for barocaloric materials. Short Summer School on TA&C. Chisinau, Moldavia, 2017.
Selected research projects
- ANR SUPER (2025-2029): Ferroelectric superlattices for tunable thermal conductivity [WP leader]
- ERC Starting Grant (2023-2027): Ferroic Materials for Dynamic Heat Flow Control [leader]
- EIC Pathfinder (2024-2028): First Regenerative Solid-State Barocaloric Refrigerator
- ANR PRC (2024-2028): Study and sintering of molecular compounds for barocaloric refrigeration
- APRIA (2022): Influence of domain walls on the thermal conductivity of ferroelectric oxides [leader]
- 1851 Research Fellowship (2018-2020): Colossal barocaloric effects in liquid crystals [leader]