{"title":"Temperature-dependent defect dipoles polarization of (La, Nb) co-doped TiO2/PEI microwave absorption materials","authors":"Xiao-Bin Zhou, Wen-Wen Wu, Rui Li, Zhuo Wang, Yue-Chan Song, Lu-lu Han, Wen-Peng Liao, Li-Ling Liu, Zhen-Hao Han, Xiao-Ming Chen, Peng Liu","doi":"10.1063/5.0260963","DOIUrl":null,"url":null,"abstract":"Point defect engineering has emerged as a key strategy to pursue efficient microwave absorption (MA) by effectively balancing impedance matching and polarization loss. Nevertheless, the detailed interplay between the temperature-driven dielectric relaxation characteristics and the absorption dissipation mechanisms remains an area that requires deeper exploration. Here, (La0.5Nb0.5)xTi1-xO2/polyetherimide (x = 0, 0.25%, 0.5%, and 1%) composites were prepared by co-doping TiO2 with donor (Nb5+) and acceptor (La3+) ions. As the concentration of point dipoles increases, the enhanced polarization loss significantly amplifies MA dissipation, demonstrating substantial potential for high-temperature applications at x = 0.5%. Notably, the point dipole polarization model provides a more comprehensive explanation of the relaxation time (τ), activation energy (Wη), and T. This behavior is attributed to strong polarization loss resulting from short-range electronic motion suppressed by those defect clusters, which provides a theoretical foundation for further understanding the mechanisms of microwave dissipation and high-temperature absorption potential.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"14 1","pages":""},"PeriodicalIF":3.5000,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Physics Letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1063/5.0260963","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
Point defect engineering has emerged as a key strategy to pursue efficient microwave absorption (MA) by effectively balancing impedance matching and polarization loss. Nevertheless, the detailed interplay between the temperature-driven dielectric relaxation characteristics and the absorption dissipation mechanisms remains an area that requires deeper exploration. Here, (La0.5Nb0.5)xTi1-xO2/polyetherimide (x = 0, 0.25%, 0.5%, and 1%) composites were prepared by co-doping TiO2 with donor (Nb5+) and acceptor (La3+) ions. As the concentration of point dipoles increases, the enhanced polarization loss significantly amplifies MA dissipation, demonstrating substantial potential for high-temperature applications at x = 0.5%. Notably, the point dipole polarization model provides a more comprehensive explanation of the relaxation time (τ), activation energy (Wη), and T. This behavior is attributed to strong polarization loss resulting from short-range electronic motion suppressed by those defect clusters, which provides a theoretical foundation for further understanding the mechanisms of microwave dissipation and high-temperature absorption potential.
期刊介绍:
Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology.
In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics.
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