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https://www.ias.ac.in/article/fulltext/boms/043/0282

Ferroelectrics; solid-state reaction; piezoelectrics; lead-free materials.

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.

A PRADO¹ F RUBIO-MARCOS^{2 3} L RAMAJO¹ M S CASTRO¹

1. Institute of Research in Materials Science and Technology (INTEMA), Av. Colo´n 10850, B7606BWV Mar del Plata, Argentina
2. Electroceramic Department, Instituto de Cera´mica y Vidrio, CSIC, Kelsen 5, 28049 Madrid, Spain
3. Escuela Polite´cnica Superior, Universidad Antonio de Nebrija, Pirineos 55, 28040 Madrid, Spain

Published

17 October 2020

Manuscript received

21 February 2020

Accepted

11 June 2020

Final version published online

17 October 2020