Yoo, So Yeon Yim, Haena Nahm, Sahn Choi, Ji-Won 2024-01-19T14:31:25Z 2024-01-19T14:31:25Z 2021-10-21 2021-06-15 0272-8842 https://pubs.kist.re.kr/handle/201004/116855 Dion-Jacobson-phase perovskites have received continuous attention owing to their impressive properties such as the ability to convert them into a two-dimensional (2D) form. We report a new Dion-Jacobson phase-layered perovskite KCa2LiNb4O13 ceramics prepared by a solid-state synthesis method. The KCa2LiNb4O13 ceramic exhibited a large dielectric permittivity of 61 at 1 MHz, which is three times higher than that of KCa2Nb3O10 (epsilon r = 20), owing to an increase in the number of octahedral units (n), which causes considerably high polarization in perovskite lattices. Moreover, as engineering octahedral units by lithium ion addition instead of sodium ions, KCa2LiNb4O13 ceramic showed improved and stable dielectric properties over a wide frequency range. Moreover, the exfoliated form of 2D Ca2LiNb4O13 nanosheets was successfully synthesized via a two-step cation exchange method. English ELSEVIER SCI LTD 2D NANOSHEETS NIOBATE Design of dispersion-free dielectrics as engineering perovskite unit cells of KCa2Li(n-3)NbnO3n+1 ceramics Article 10.1016/j.ceramint.2021.03.046 1 CERAMICS INTERNATIONAL, v.47, no.12, pp.17331 - 17336 CERAMICS INTERNATIONAL 47 12 17331 17336 scie scopus 000648613400004 2-s2.0-85102317519 Materials Science, Ceramics Materials Science Article 2D NANOSHEETS NIOBATE Dielectric properties Perovskite Soft chemical method