Large electrostrain in Bi1/2Na1/2TiO3-based relaxor ferroelectrics: A case study of Bi1/2Na1/2TiO3-Bi1/2K1/2TiO3-Bi(Ni2/3Nb1/3)O3 ceramics
Publication Name
Journal of Materiomics
Abstract
(1-x)(0.8Bi Na TiO -0.2Bi K TiO )-xBi(Ni Nb )O (BNKT-xBNN) solid solution ceramics were fabricated by high temperature solid-state reaction method. All the compositions possess relaxor ferroelectric features, among which the ergodic BNKT-0.02BNN exhibits large repeatable electrostrain value S = 0.51% at electric field of 65 kV/cm, with high piezoelectric stain coefficient d ∗ of 890 pm/V at 45 kV/cm, while the non-ergodic compositions present unrepeatable large strain response. Based on the electric field-composition phase diagram, the repeatability of strain response in ergodic compositions can be attributed to the reversible electric-field-induced phase transition. In addition, the effects of BNN contents on the macroscopic strain properties are explored by analyzing the existing states of the polar regions with corresponding thermal evolutions and electric-field-induced phase transitions. This research is expected to guide the design of lead free relaxor ferroelectric materials with desired electrostrain properties. 1/2 1/2 3 1/2 1/2 3 2/3 1/3 3 uni 33
Open Access Status
This publication may be available as open access
Volume
7
Issue
3
First Page
593
Last Page
602
Funding Number
51672220
Funding Sponsor
National Natural Science Foundation of China