Lead-free electrostrictive bismuth perovskite ceramics with thermally stable field-induced strains
2011; Elsevier BV; Volume: 65; Issue: 17-18 Linguagem: Inglês
10.1016/j.matlet.2011.05.059
ISSN1873-4979
AutoresVu Diem Ngoc Tran, Hyoung‐Su Han, Chang-Ho Yoon, Jae‐Shin Lee, Wook Jo, Jürgen Rödel,
Tópico(s)Microwave Dielectric Ceramics Synthesis
ResumoElectric field-induced strain (EFIS) properties of Bi1/2(Na0.82K0.18)1/2TiO3 (BNKT) ceramics modified with Sr(K1/4Nb3/4)O3 (SKN) have been investigated as functions of composition and temperature. BNKT ceramics near a phase boundary revealed the coexistence of ferroelectric rhombohedral and tetragonal phases, resulting in a typical ferroelectric butterfly-shaped bipolar S–E loop at room temperature, whose normalized strain (Smax/Emax) showed a significant temperature coefficient of 0.38 pm/V/K. However, 5 mol% SKN-modified BNKT ceramics revealed a typical electrostrictive behaviour with a thermally stable electrostrictive coefficient, Q33 = 0.021 m4/C2, which is almost comparable to that of Pb(Mg1/3Nb2/3)O3 (PMN) ceramics that have been dominantly used as Pb-based electrostrictive materials over the last decades.
Referência(s)