中国物理B ›› 2009, Vol. 18 ›› Issue (10): 4511-4514.doi: 10.1088/1674-1056/18/10/068

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Great enhancement in remnant polarization of SrBi4Ti4O15 thin films by A-site doping of Fe3+ ions

孙家宝, 孙慧, 王伟, 蔡华, 陈小兵   

  1. College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China
  • 收稿日期:2008-09-30 修回日期:2009-03-12 出版日期:2009-10-20 发布日期:2009-10-20

Great enhancement in remnant polarization of SrBi4Ti4O15 thin films by A-site doping of Fe3+ ions

Sun Jia-Bao(孙家宝), Sun Hui(孙慧), Wang Wei(王伟), Cai Hua(蔡华), and Chen Xiao-Bing(陈小兵)†   

  1. College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China
  • Received:2008-09-30 Revised:2009-03-12 Online:2009-10-20 Published:2009-10-20

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摘要： SrBi4-xFexTi4O15 (SBFT-x) thin films (x =0.00, 0.05, 0.08, 0.15) have been synthesized on Pt/Ti/SiO2/Si (100) substrates by sol-gel method. This paper finds that Fe-doping does not change the crystal structure of SrBi4Ti4O15 (SBTi). The coercive filed (Ec) and remnant polarisation (Pr) increase at first, then decrease with the increase of Fe doping content. At a maximum applied field of 229~kV/cm, the 2Pr reaches a maximum value of 91.1~μ C/cm2 at x = 0.05 and the corresponding Ec is 72~kV/cm. The 2Pr increases by about 260% and the Ec decreases by about 6%, respectively. Obviously, the ferroelectric property of SrBi4Ti4O15 is greatly enhanced by Fe doping. The fatigue-endurance characteristic of the SBFT-0.05 is not improved. After 1.1×10^9 read/write cycles at a frequency of 50~kHz, the nonvolatile polarisations (Pnv= P*- PΛ) decreased about 48% of its initial value.

Abstract: SrBi4-xFexTi4O15 (SBFT-x) thin films (x =0.00, 0.05, 0.08, 0.15) have been synthesized on Pt/Ti/SiO2/Si (100) substrates by sol-gel method. This paper finds that Fe-doping does not change the crystal structure of SrBi4Ti4O15 (SBTi). The coercive filed (Ec) and remnant polarisation (Pr) increase at first, then decrease with the increase of Fe doping content. At a maximum applied field of 229 kV/cm, the 2Pr reaches a maximum value of 91.1 μC/cm2 at x = 0.05 and the corresponding Ec is 72 kV/cm. The 2Pr increases by about 260% and the Ec decreases by about 6%, respectively. Obviously, the ferroelectric property of SrBi4Ti4O15 is greatly enhanced by Fe doping. The fatigue-endurance characteristic of the SBFT-0.05 is not improved. After 1.1×109 read/write cycles at a frequency of 50 kHz, the nonvolatile polarisations (Pnv= P*- PΛ) decreased about 48% of its initial value.

Key words: thin films, remnant polarisation, ferroelectrics, fatigue

中图分类号: 

  • 77.55.+f
68.55.Ln (Defects and impurities: doping, implantation, distribution, concentration, etc.) 77.22.Ej (Polarization and depolarization) 77.80.Dj (Domain structure; hysteresis) 81.15.Lm (Liquid phase epitaxy; deposition from liquid phases (melts, solutions, And surface layers on liquids))