Doctoral thesis (Dissertations and theses)
Old and New Antiferroelectrics: Experimental Studies of Phase Transitions in Model Materials
Milesi-Brault, Cosme
2021
 

Files


Full Text
CosmeMilesi-Brault_PhD_thesis_AFE_online_version.pdf
Author preprint (13.77 MB)
Download

All documents in ORBilu are protected by a user license.

Send to



Details



Keywords :
antiferroelectric; antiferroelectricity; ferroelectric; antiferroic; ferroic; phase transition; Raman; inelastic scattering; sol-gel; chemical solution deposition; lead zirconate; PbZrO3; francisite; Cu3Bi(SeO3)2O2Cl
Abstract :
[en] Antiferroelectrics are a subcategory of ferroic materials that display no spontaneous polarisation due to antiparallel ionic displacements. These materials undergo an electric field-induced transition to a polar phase accompanied by the emergence of a spontaneous polarisation. As for ferroelectrics, heating up an antiferroelectric material above a certain temperature Tc will cause another phase transition towards a paraelectric phase. Antiferroelectricity is currently the subject of a renewed interest, mostly due to a rising need of new smart materials for applications such as energy storage, electrocaloric cooling or microelectronics. The most-studied antiferroelectric is lead zirconate PbZrO3perovskite. However, the understanding of its switching mechanism is still incomplete. In this work, we will first present our study on the sol-gel synthesis and characterisation of antiferroelectric polycrystalline thin films of canonical lead zirconate PbZrO3. We will notably highlight the realisation of an in-plane switching of our antiferroelectric samples grown on transparent substrates, as well as the optical observation of this switching through birefringence changes. On a more fundamental side, the oldest and best-known model of antiferroelectricity was defined by Kittel in 1951. No real unidimensional Kittel-like model material has, to our knowledge, been identified yet. We will detail our spectroscopic study of the lattice dynamics of francisite Cu3Bi(SeO3)2O2Cl which combines several inelastic scattering experiments. We will then discuss how this study proves that francisite is, to our knowledge, the best candidate of a material displaying a displacive antiferroelectric phase transition.
Research center :
LIST - Luxembourg Institute of Science & Technology
Disciplines :
Physics
Author, co-author :
Milesi-Brault, Cosme ;  University of Luxembourg > Faculty of Science, Technology and Medecine (FSTM) ; Luxembourg Institute of Science & Technology - LIST > Materials Research and Technology > Ferroic Materials for Transducers
Language :
English
Title :
Old and New Antiferroelectrics: Experimental Studies of Phase Transitions in Model Materials
Defense date :
08 July 2021
Institution :
Unilu - University of Luxembourg, Esch-sur-Alzette, Luxembourg
Degree :
Docteur en Physique
Promotor :
President :
Jury member :
Defay, Emmanuel 
Maglione, Mario
Buixaderas, Elena
Focus Area :
Physics and Materials Science
FnR Project :
FNR11348912 - Bismuth-based Antiferroelectrics As Tunable Materials, 2016 (01/09/2017-31/12/2020) - Mael Guennou
Funders :
FNR - Fonds National de la Recherche [LU]
Available on ORBilu :
since 26 August 2021

Statistics


Number of views
406 (37 by Unilu)
Number of downloads
184 (19 by Unilu)

Bibliography


Similar publications



Contact ORBilu