Similarities of large electromechanical coupling factors (k s) in perovskite binary material systems were studied. Five large-k s material systems, PZT 53/47, PZNT 91/9, PMNT 67/33, PSTT 55/45 and PSNT 57/43, were compared. These five large-ks material systems were found to show four similarities: rhombohedral and tetragonal morphotropic phase boundary (MPB), large polarization (P r>25 µ C/cm2), proper B1 ionic size (70–72 pm) and large B2 ion (64 pm) in Pb(B1, B2)O3 relaxors and proper B-site average ionic sizes of MPB composition (64.7–66.8 pm). For example, in this study, the maximum coupling factors (k p=72 %, k 31=45 %, and k 33=77 %) were obtained in Pb[(Sc1/2Nb1/2)0.57Ti0.43]O3+0.005Nb2O5(PSNTN 57/43) piezoelectric ceramic materials.
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Yohachi Yamashita Yohachi Yamashita (1994) studied this question.
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