Deconvolution of Phonon Scattering by Ferroelectric Domain Walls and Point Defects in a PbTiO3Thin Film Deposited in a Composition-Spread Geometry
Bugallo, David (Universidade de Santiago de Compostela. Departamento de Química Física)
Langenberg, Eric (Universitat de Barcelona. Institut de Nanociència i Nanotecnologia)
Ferreiro-Vila, Elias (Centro Singular de Investigacion en Quimica Bioloxica e Materiais Moleculares (CiQUS))
Smith, Eva H. (Cornell University. Department of Materials Science and Engineering)
Stefani, Christina (Institut Català de Nanociència i Nanotecnologia)
Batlle, Xavier (Universitat de Barcelona. Departament de Física de la Matèria Condensada)
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)
Domingo Marimon, Neus (Institut Català de Nanociència i Nanotecnologia)
Schlom, Darrell G. (Kavli Institute at Cornell for Nanoscale Science)
Rivadulla, Francisco (Universidade de Santiago de Compostela. Departamento de Química Física)

Date:	2021
Abstract:	We present a detailed analysis of the temperature dependence of the thermal conductivity of a ferroelectric PbTiO3 thin film deposited in a composition-spread geometry enabling a continuous range of compositions from ∼25% titanium deficient to ∼20% titanium rich to be studied. By fitting the experimental results to the Debye model we deconvolute and quantify the two main phonon-scattering sources in the system: ferroelectric domain walls (DWs) and point defects. Our results prove that ferroelectric DWs are the main agent limiting the thermal conductivity in this system, not only in the stoichiometric region of the thin film ([Pb]/[Ti] ≈ 1) but also when the concentration of the cation point defects is significant (up to ∼15%). Hence, DWs in ferroelectric materials are a source of phonon scattering at least as effective as point defects. Our results demonstrate the viability and effectiveness of using reconfigurable DWs to control the thermal conductivity in solid-state devices.
Grants:	Ministerio de Ciencia e Innovación MAT2016-80762-R Agencia Estatal de Investigación PID2019-104150RB-I00 Agencia Estatal de Investigación PGC2018-097789-B-I00 European Commission 734187 European Commission 708129 Ministerio de Economía y Competitividad BES-2017-079688
Note:	Altres ajuts: Serra Hunter Fellow (Generalitat de Catalunya)
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Composition-spread combinatorial study ; Ferroelectrics ; Thermal conductivity ; Phonon-scattering mechanisms ; Domain walls
Published in:	ACS applied materials & interfaces, Vol. 13, Num. 38 (September 2021) , p. 45679-45685, ISSN 1944-8252

DOI: 10.1021/acsami.1c08758

Postprint 29 p, 1.5 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles