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En relación con los Seminarios del Departamento de Física de la
Materia Condensada, os envio la información de la charla para la
semana que viene y adjunto el cartel anunciador en pdf. <br>
<br>
Muchas gracias y un saludo <br>
Fernando y Jorge <br>
<br>
<b>Título: </b>Flexoelectricity: from bent barium titanate to
broken bones. <br>
<br>
<b>Ponente: </b>Gustau Catalán (ICREA and Institut Català de
Nanociència i Nanotecnologia (ICN2), Barcelona<b>)<br>
</b><b><br>
</b><b>Lugar</b><b><b>:</b></b> Sala de Grados de la Facultad de
Ciencias<b><br>
</b><b><br>
Fecha y hora:</b><b> </b>Viernes 7 de Junio a las 12:30<br>
<br>
<b>Resumen de la charla:</b> Piezoelectric materials are
characterized by their ability to generate an electrical
polarization in response to a deformation. In some piezoelectrics,
the sign of this electrical polarization can be switched by an
external voltage; these are called ferroelectrics and have many
practical uses, including ferroelectric memories. <br>
Piezoelectric materials are rare, and ferroelectric materials are
rarer still. In contrast, flexoelectricity is a universal property
of all materials. Flexoelectricity couples electrical polarization
not to strain but to strain gradients, and it can be found in
virtually all non-metallic materials: from insulators to
semiconductors, and from ceramics and polymers to bones. In
addition, this property is not incompatible with piezoelectricity,
and the combination of the two leads to new functionalities that do
not exist on their own. <br>
In this talk, after a general introduction to the main concepts of
ferroelectricity, piezoelectricity and flexoelectricity, I will
present recent and eye-catching results from our laboratory in the
area of flexoelectricity. These will include the existence and
consequences of flexoelectricity in semiconductors, the use of
flexoelectricity to switch crack propagation with a voltage in
ferroelectrics, and the role of flexoelectricity in the self-repair
of our own bones.<br>
<br>
<b>Resumen CV: </b>Prof. Catalan is an ICREA Research Professor at
the Catalan Institute of Nanoscience and Nanotechnology (ICN2) in
Barcelona. Previously he worked at Cambridge, Groningen and Belfast
–where he did his PhD. He is an expert in the physics of oxides at
the nanoscale, with an emphasis on ferroelectrics and multiferroics.
Some of his best known works concern the properties of domain walls
(so-called domain wall nanoelectronics) and flexoelectricity.
Flexoelectricity was the subject of the ERC grant with which he set
up his specialized laboratory at ICN2, and will be the main topic of
his talk.<br>
<br>
<pre class="moz-signature" cols="72">--
Dr. Jorge Lobo Checa
e-mail: <a class="moz-txt-link-abbreviated" href="mailto:jorge.lobo@csic.es" moz-do-not-send="true">jorge.lobo@csic.es</a>
=============================================================
ICMA - Instituto de Ciencia de Materiales de Aragón (CSIC-UZ)
Facultad de Ciencias, Universidad de Zaragoza
C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain
tel: +34 876 553353
=============================================================
Personal webpage: <a class="moz-txt-link-freetext" href="http://sagan.csic.es/web/en/directorio/lobo-checa-jorge" moz-do-not-send="true">http://sagan.csic.es/web/en/directorio/lobo-checa-jorge</a>
<a class="moz-txt-link-freetext" href="https://www.tnsi-poctefa.eu" moz-do-not-send="true">https://www.tnsi-poctefa.eu</a></pre>
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