Effect of A-site Excess on the Piezoelectric Properties of (K_0.48 Na_0.52)_1+x(Nb_0.55Ta_0.45)O₃ Thin Films

J. S. ParkSchool of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam641-773, Republic of Korea

D. DoDepartment of Materials Science and Engineering, Keimyung University, Daegu704-701, Republic of Korea

M. H. LeeSchool of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam641-773, Republic of Korea

D. J. KimSchool of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam641-773, Republic of Korea

M.-H. KimSchool of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam641-773, Republic of Korea

J. S. KimSchool of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam641-773, Republic of Korea

R. KambaleInstitute of Basic Sciences, Changwon National University, Changwon, Gyeongnam641-773, Republic of Korea

S. W. KimDepartment of Physics, Changwon National University, Changwon, Gyeongnam641-773, Republic of Korea

W.-J. KimDepartment of Physics, Changwon National University, Changwon, Gyeongnam641-773, Republic of Korea

S. S. KimDepartment of Physics, Changwon National University, Changwon, Gyeongnam641-773, Republic of Korea

K. W. JangDepartment of Physics, Changwon National University, Changwon, Gyeongnam641-773, Republic of Korea

I. R. HwangDepartment of Physics, Konkuk University, Seoul143-701Republic of Korea

B. H. ParkDepartment of Physics, Konkuk University, Seoul143-701Republic of Korea

T. K. SongSchool of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam641-773, Republic of KoreaCorrespondence[email protected]

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Abstract

Lead-free polycrystalline (K_0.48Na_0.52)_1+x(Nb_0.55Ta_0.45)O₃ (x = 0, 0.01, 0.02 and 0.03) thin films have been grown on Pt(111)/Ti/SiO₂/Si substrates using KrF excimer laser ablation to investigate the effects of A-site ion excess. The film at x = 0.01 exhibited good ferroelectric hysteresis loop with a remnant polarization 2P_r of 30 μC/cm² and coercive field 2E_c of 61 kV/cm. The piezoelectric coefficient d_33,f of the KNNT film with x = 0.01 was found to amount to 79 pm/V. These improved ferroelectric and piezoelectric properties were attributed to the excess of A-site Na and K ions.

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Effect of A-site Excess on the Piezoelectric Properties of (K_0.48 Na_0.52)_1+x(Nb_0.55Ta_0.45)O₃ Thin Films

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Effect of A-site Excess on the Piezoelectric Properties of (K0.48 Na0.52)1+x(Nb0.55Ta0.45)O3 Thin Films

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Effect of A-site Excess on the Piezoelectric Properties of (K_0.48 Na_0.52)_1+x(Nb_0.55Ta_0.45)O₃ Thin Films