Premium
Large Electromechanical Strain in Lead‐Free Binary System K 0.5 Bi 0.5 TiO 3 ‐ Bi ( Mg 0.5 Ti 0.5 ) O 3
Author(s) -
Zeb Aurang,
Milne Steven J.
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13110
Subject(s) - tetragonal crystal system , single phase , materials science , analytical chemistry (journal) , phase (matter) , crystallography , polarization (electrochemistry) , binary number , mineralogy , chemistry , crystal structure , electrical engineering , arithmetic , mathematics , organic chemistry , chromatography , engineering
Solid solution formation in the lead‐free binary system (1− x ) K 0.5 Bi 0.5 TiO 3 − x Bi ( Mg 0.5 Ti 0.5 ) O 3 has been studied for compositions x ≤ 0.12. X‐ray powder diffraction shows single‐phase perovskite for x < 0.1, and a mixed phase region between tetragonal and pseudocubic phases for compositions 0.04 ≤ x ≤ 0.06. Large electromechanical strains of ~0.3% at fields of 50 kV/cm are recorded in the mixed phase region, with d 33 * ( S max / E max ) values of ~600 pm/V. The materials sustain polarization at low electric fields with remnant polarization ~18 μC/cm 2 and coercive field ~20 kV/cm for x = 0.06. Relative permittivity‐temperature plots display relaxor characteristics, with peak temperature ~340°C.