Articles written in Bulletin of Materials Science

• Dielectric and ferroelectric properties evolution of ($1-x$)(Bi$_{0.5}$Na$_{0.5}$TiO$_3$)–$x$K$_{0.5}$Na$_{0.5}$NbO$_3$ piezoceramics

In this work, piezoceramics of ($1-x$)(Bi$_{0.5}$Na$_{0.5}$)TiO$_3$$–x$(K$_{0.5}$Na$_{0.5}$)NbO$_3$, ($1-x$)BNT$–x$KNN, in the compositional range 0.00 ≤ $x$ ≤ 0.07, were prepared by a mechanochemically activated solid-state method. The structural phase formation and microstructural, dielectric, and ferroelectric properties were studied. Although changes, in symmetry of the perovskite structure, were not detected with the composition (i.e., from a perspective of its intrinsic properties), the microstructural evolution was strongly dependent on the content of the KNN phase (i.e., based on its extrinsic properties). Specifically, KNN favoured the formation of a microstructure with cubic grains, typical morphology of the alkalineniobate ceramics. After KNN addition, both the maximum permittivity temperature and the long-range to short-range ordered transition temperature were reduced. Additionally, ferroelectric loops and strain deformation curves also reflect the long-range to short-range order evolution with KNN addition and temperature.

• # Bulletin of Materials Science

Volume 43, 2020
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020