Room temperature multiferroic behavior and magnetoelectric coupling in (K,Na)NbO3-based ceramics

Robust and Tunable Ferroelectricity in Ba/Co Codoped (K0.5Na0.5)NbO3 Ceramics

“…It shows that the cooling rate has no obvious effect on the lattice structure of ceramic samples, which is consistent with literature. [1,3,14] However, the diffraction peaks of the SC sample are sharper than those of the RC sample, as seen more clearly from the local magnification in Fig. 1(a), which is often associated with the increase in grain size.…”

“…Their outstanding electrical properties make them promising for significant applications in energy harvesting, energy storage, information storage, and photoelectric detection, etc. [1][2][3][4][5][6] The electrical properties of KNN-based ceramic could be modulated by different methods such as texture sintering, chemical doping, domain engineering and compositing. [7,8] For example, Satio et al prepared KNNbased textured ceramics using the reactive template grain growth method and achieved excellent piezoelectric properties.…”

“…[14] Dielectric relaxation behavior was induced in Li/Sb-doped KNN bulk materials. [3] Sb doping could modulate the long-range ferroelectric order, so as to construct the multiphase coexistence near room temperature, and result in a nearly twofold increase in piezoelectric coefficient (𝑑33 ∼ 539 pC/N). [15] In Ni/Ba co-doped KNN ceramics, the ferroelectric domains and domain walls could be reversibly controlled through light illumination.…”

“…In this work, the content of oxygen vacancies in the fine-grain RC sample is less than that in the large-grain SC sample, which is contrary to our usual understanding and could be attributed to the particularity of the way oxygen vacancies introduced. Here, for the KNN ceramics, where the commonly discussed charged defects are cation vacancies at A sites, [3,24] we introduce Ba 2+ and Co 2+ ions at A and B sites, to replace the original K + /Na + and Nb 5+ ions, respectively. Through this heterovalent doping, we consciously introduce oxygen vacancies.…”