Enhanced energy storage efficiency with superior thermal stability under low electric field and large electric field driven strain in environment- friendly Bi0.5Na0.5TiO3 based ferroelectric modified with LiNbO3

In this work, a comprehensive study was carried out on LiNbO3 doped Bi0.5Na0.5TiO3 system with chemical formula (1-x) Bi0.5Na0.5TiO3-xLiNbO3 (1-xBNT-xLN) where x varied from 0.0 to 0.1. Structural investigation reveals that addition of LN to BNT alter the parent rhombohedral symmetry and induces tetragonal sym-metry in the system. In fact, a coexistence of rhombohedral and tetragonal symmetries was identified in the compositional range 0.01 <= x <= 0.02. However, above x = 0.02 system (up to x <= 0.08) was observed to have tetragonal symmetry only. It was also noted that LiNbO3 content disturb long range ferroelectric order and induce relaxor AFE structure in BNT-LN system resulting in pinched P-E loops at near room temperature for x = 0.06, 0.08 compositions. As a result, a remarkably high electric field driven strain similar to 0.45% was achieved for sample x = 0.06 with 6% variation over the temperature range 25 degrees C <= T <= 150 degrees C. On the other hand, improved energy storage parameters Wrec = 3.62, eta = 80.8% were observed for ceramic x = 0.08 with good thermal stability which make x = 0.08 a suitable material for practical application in energy storage field.(c) 2023 Elsevier B.V. All rights reserved.