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The high\u2010density HESO\u20108 NP pellets possess around 1000\u2010fold lower thermal diffusivity than that of air, resulting in much slower heat propagation when subjected to a transient heat flux. The low thermal conductivity and diffusivity are realized by suppressing all three modes of heat transfer, namely solid conduction, gas conduction, and thermal radiation, via stable nanoconstriction and infrared\u2010absorbing nature of the HESO\u20108 NPs, which are enabled by remarkable microstructural stability against coarsening at high temperatures due to the high entropy. This work can elucidate the design of the next\u2010generation high\u2010temperature thermal insulation materials using high\u2010entropy ceramic nanostructures.\n                  <\/jats:p>","DOI":"10.1002\/adma.202406732","type":"journal-article","created":{"date-parts":[[2024,12,27]],"date-time":"2024-12-27T03:08:06Z","timestamp":1735268886000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Low Thermal Conductivity and Diffusivity at High Temperatures Using Stable High\u2010Entropy Spinel Oxide Nanoparticles"],"prefix":"10.1002","volume":"37","author":[{"given":"Ka Man","family":"Chung","sequence":"first","affiliation":[{"name":"Program in Materials Science and Engineering University of California  San Diego La Jolla CA 92093 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarath R.","family":"Adapa","sequence":"additional","affiliation":[{"name":"Department of Mechanical and Aerospace Engineering University of California  San Diego La Jolla CA 92093 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Pei","sequence":"additional","affiliation":[{"name":"Department of Mechanical and Aerospace Engineering University of California  San Diego La Jolla CA 92093 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ram Hemanth","family":"Yeerella","sequence":"additional","affiliation":[{"name":"Department of Mechanical and Aerospace Engineering University of California  San Diego La Jolla CA 92093 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li","family":"Chen","sequence":"additional","affiliation":[{"name":"Program in Materials Science and Engineering University of California  San Diego La Jolla CA 92093 USA"},{"name":"Department of Electrical and Computer Engineering University of California San Diego  La Jolla CA 92093 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