Giant electrostrictive strain in (Bi_0.5Na_0.5)TiO₃–NaNbO₃ lead-free relaxor antiferroelectrics featuring temperature and frequency stability

A new lead-free 0.76BNT-0.24NN relaxor AFE ceramic exhibits linear <italic>P</italic>–<italic>E</italic>, <italic>S</italic>–<italic>P</italic>² and <italic>S</italic>–<italic>E</italic>² responses and giant purely-electrostrictive strains of ∼0.20% within ˂10% in a wide temperature range owing to the existence of anti-polar nanoregions (APNRs).