TY - JOUR
T1 - Approach for enhanced polarization of polycrystalline bismuth titanate films by Nd3+/V5+ cosubstitution
AU - Uchida, Hiroshi
AU - Yoshikawa, Hiroki
AU - Okada, Isao
AU - Matsuda, Hirofumi
AU - Iijima, Takashi
AU - Watanabe, Takayuki
AU - Kojima, Takashi
AU - Funakubo, Hiroshi
PY - 2002/9/16
Y1 - 2002/9/16
N2 - Thin films of Nd3+-substituted bismuth titanate, (Bi 4.00-y,Ndy)Ti3.00O12 (BNT), Nd 3+/V5+-cosubstituted bismuth titanate, (Bi 4.00-y,Ndy)(Ti3.00-xVx)O 12 (BNTV), and La3+-substituted bismuth titanate, (Bi 3.25,La0.75)Ti3.00O12 (BLT) were fabricated on the (111)Pt/Ti/SiO2/(100)Si substrates by a chemical solution deposition technique. These films possessed random-oriented polycrystalline structure. The BNT film had larger remnant polarization (P r) than the BLT film; Pr and coercive field (E c) of the BNT film with y=0.50 were 32 μC/cm2 and 126 kV/cm, respectively. Furthermore, V5+ substitution improved the Pr value of the BNT film up to 37 μC/cm2 (BNTV film; y=0.50, x=0.02), while the BNTV film had an Ec value of approximately 119 kV/cm which was similar to that of the BNT film. Ferroelectric properties of the Pb-free polycrystalline BNT and BNTV films are comparable with those of conventional Pb-based ferroelectric films like a lead zirconate titanate.
AB - Thin films of Nd3+-substituted bismuth titanate, (Bi 4.00-y,Ndy)Ti3.00O12 (BNT), Nd 3+/V5+-cosubstituted bismuth titanate, (Bi 4.00-y,Ndy)(Ti3.00-xVx)O 12 (BNTV), and La3+-substituted bismuth titanate, (Bi 3.25,La0.75)Ti3.00O12 (BLT) were fabricated on the (111)Pt/Ti/SiO2/(100)Si substrates by a chemical solution deposition technique. These films possessed random-oriented polycrystalline structure. The BNT film had larger remnant polarization (P r) than the BLT film; Pr and coercive field (E c) of the BNT film with y=0.50 were 32 μC/cm2 and 126 kV/cm, respectively. Furthermore, V5+ substitution improved the Pr value of the BNT film up to 37 μC/cm2 (BNTV film; y=0.50, x=0.02), while the BNTV film had an Ec value of approximately 119 kV/cm which was similar to that of the BNT film. Ferroelectric properties of the Pb-free polycrystalline BNT and BNTV films are comparable with those of conventional Pb-based ferroelectric films like a lead zirconate titanate.
UR - http://www.scopus.com/inward/record.url?scp=79955984190&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79955984190&partnerID=8YFLogxK
U2 - 10.1063/1.1507839
DO - 10.1063/1.1507839
M3 - Article
AN - SCOPUS:79955984190
VL - 81
SP - 2229
EP - 2231
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 12
ER -