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Indeed, grain boundaries enhance the probability of phonon scattering events, which has been applied to control the thermal transport in a wide range of materials, including hard metals, diamond, oxides, and two\u2010dimensional (2D) systems such as graphene. Here, the opposite behavior in improper ferroelectric ErMnO\n                    <jats:sub>3<\/jats:sub>\n                    polycrystals is reported, where the thermal conductivity decreases with increasing grain size. This unusual relationship between heat transport and microstructure is attributed to phonon scattering at ferroelectric domain walls. The domain walls are more densely packed in larger grains, leading to an inversion of the classical grain\u2010boundary\u2010dominated transport behavior. The findings open additional avenues for microstructural engineering of materials for thermoelectric and thermal management applications, enabling simultaneous control over mechanical, electronic, and thermal properties.\n                  <\/jats:p>","DOI":"10.1002\/advs.202506931","type":"journal-article","created":{"date-parts":[[2025,7,25]],"date-time":"2025-07-25T21:06:04Z","timestamp":1753477564000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Domain\u2010Wall Driven Suppression of Thermal Conductivity in a Ferroelectric Polycrystal"],"prefix":"10.1002","volume":"12","author":[{"given":"Rachid","family":"Belrhiti\u2010Nejjar","sequence":"first","affiliation":[{"name":"GREMAN UMR 7347 Universit\u00e9 de Tours CNRS INSA\u2010CVL  Blois 41034 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