Correction: Layered intercalation ferroelectricity induced by asymmetric ion coordination: a mini-review

Abstract

Correction for ‘Layered intercalation ferroelectricity induced by asymmetric ion coordination: a mini-review’ by Yaxin Gao et al., Nanoscale, 2025, 17, 25477–25483, https://doi.org/10.1039/D5NR03854E.

---

The authors regret the omission of the relevant permission statements for the reproduction of figures from published works in the original article. The updated captions for Fig. 1, 2, 3 and 4 are shown below.

Fig. 1 Ferroelectric switching pathway of (a) 2D Cu_xBi₂Se₃ (reproduced with permission from ref. 18 © WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, [copyright 2019]), (b) 3D CuCrS₂ (reprinted under a Creative Commons Attribution 4.0 International License¹⁹), and (c) 3D A₂Mo₃O₈ (reproduced from ref. 20 with the permission of AIP Publishing) via the combination of in-plane and out-of-plane displacements of intercalated metal ions, where the polarizations stem from the tetra-coordination of Cu or A ions.

Fig. 2 (a) Illustration and height profiles of the Au-encapsulated CuCrS₂ flake on a SiO₂/Si substrate covered with a conductive layer of Cr/Au, and OOP and IP phase images after forward (−5 V) and reverse (+5 V) DC bias, and the corresponding ferroelectric hysteresis loops. Reproduced with permission from ref. 9 © [2022] American Chemical Society. (b) PFM phase and amplitude hysteresis loop of the CuScS₂ nanosheet and temperature-dependent optical SHG measurement. Reprinted under a Creative Commons Attribution 4.0 International License.¹¹ (c) Schematic diagram of lateral and vertical devices based on the AgCrS₂ nanosheet, and I–V curves of the lateral AgCrS₂ ferroelectric diode device after applying opposite poling voltages (3 V and −3 V). Reproduced with permission from ref. 21 © WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, [copyright 2024].

Fig. 3 (a) The change of spin distribution upon FE switching for trilayer CuCrS₂, where black and red arrows in the sketches of M–E loops denote the direction of polarization and magnetization, respectively. Reprinted under a Creative Commons Attribution 4.0 International License.¹⁹ (b) Co(MoTe₂)₂ monolayer with atomically resolved spin–orbit-coupling (SOC) energy associated with DMI, and two bimerons with opposite helicities corresponding to the same DMI vector −D. Reproduced from ref. 27 with the permission of APS Publishing. (c) Illustration of phase transitions for AgCrX₂ driven by strain or an electric field, respectively giving rise to piezoelectricity and electrostrain. Reproduced with permission from ref. 28 © [2024] American Chemical Society.

Fig. 4 (a) Schematic diagram of migration for the intercalated ions (denoted by blue spheres) along the conducting channel with ion vacancies, which gives rise to quantized ferroelectricity. Reproduced with permission from ref. 36 © [2022] American Chemical Society. (b) The conversion from layered AMX₂ to B_0.5MX₂ by the cation-exchange reaction and its ferroelectric switching pathway between bi-stable polar states (side view of the unit cell), where the displacement of B ions is equivalent to mirror reflection operation to the lattice. (c) Similar conversion from AMX₂ to C_1/3MX₂, A_1/3B_1/3MX₂ and their ferroelectric switching pathways between various equivalent polar states (top view of the unit cell), where ion displacements are equivalent to C₃ rotation operation. Reproduced from ref. 37 with permission from the Royal Society of Chemistry.

The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.

---