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Structural transition and giant strain induced by A- and B-site concurrent donor doping in Bi0.5(Na0.84K0.16)0.5TiO3–SrTiO3 ceramics
Ist Teil von
Materials letters, 2015-03, Vol.143, p.148-150
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2015
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Lead-free 0.96[{Bi0.5(Na0.84K0.16)0.5}1−xLax(Ti1−yNby)O3]–0.04SrTiO3 (BNKLTN–ST, with x, y=0.00–0.030) ceramics were synthesised by conventional solid state reaction (CSSR) method. Results showed that A- and B-site concurrent donor doping into BNKT–ST ceramics induces a phase transition from coexistence of ferroelectric tetragonal and rhombohedral to a relaxor pseudocubic phase with a significant disruption of the long-range ferroelectric order. At an optimal composition (x, y=0.010), a giant field-induced strain of S=0.38% was achieved at an applied field of 5kV/mm, with a corresponding normalized strain (Smax/Emax) of 760pm/V. Besides this, at further low field of 4kV/mm, the Smax/Emax value slightly decreased to 725pm/V, which is still highest among those obtained in non-textured lead-free BNT-based ceramics at such a low field.
•La and Nb co-doped BNKT-ST ceramics were prepared.•Easy and reproducible solid state reaction method was used.•Giant Smax/Emax=725pm/V was achieved at low driving field of 4kV/mm.•Observed Smax/Emax is higher than those of other BNT-based ceramics at 4kV/mm.