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Study on the finite-size effects in ferroelectric thin films and fine-particles

Study on the finite-size effects in ferroelectric thin films and fine-particles
铁电薄膜和细颗粒的有限尺寸效应研究
批准号:
09450126
负责人:
ISHIKAWA Kenji
金额:
$2.11万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (B)
财政年份:
1997
资助国家:
日本
项目状态:
已结题
起止时间:
1997 至 1999

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中文摘要
翻译
Finite size effects on the electric properties in ferroelectric materials were studied. Recently,the thickness of ferroelectric films is than several tens of nanometer. Accordingly,the diameter of the particles in the film may be be than than 10 nm.这是已知的some dielectric属性differ from that of bulk materials when the size of crystallites approaches nano-metersize . however,microscopic understanding of the size effect has not been obtained. In这项研究,我们deal with the size effects on the phase transition in several perovskite type ferroelectrics.The第一结果concerns with the origin of the size effect on the phase transition. the size effectsare successfully描述phenomenological theories based on the Landau-Ginzburg equation. thetheory assumes the electric polarization near the surface is not uniform and differs from the bulkvalue. We found that the crystal lattices of lead titanate and barium titanate relaxes towardsX-ray measurements with the use of a simple model. We pointed out that the size effectshould be caused by the non-homogenous polarization caused by the surface relaxation.We also studiedthe low-temperature growth of perovskite type ferroelectric films. If we can crystallize the filmat low temperatures,我们可以看电影composed of very small particles. The phase转换temperatures of such smallparticle should be than that of bulk crystals by the size effect. the dielectric constant ofthe film is expected to be larger than that of bulk material. We proposed a technique to insert aseeding layer between the film and the substrate. For example,insertion of PbTiO D23 seeding layer made it possible to obtain a well crystallized film atvery low temperature such as 450℃。
英文摘要
Finite size effects on the dielectric properties in ferroelectric materials were studied. Recently, the thickness of ferroelectric films is less than several tens of nanometer. Accordingly, the diameter of the particles in the film may be less than 10 nm. It is known that some dielectric properties differ from that of bulk materials when the size of crystallites approaches nano-meter size. However, the microscopic understanding of the size effect has not been obtained. In this research, we deal with the size effects on the phase transition in several perovskite type ferroelectrics.The first result concerns with the origin of the size effect on the phase transition. The size effects are successfully described by phenomenological theories based on the Landau-Ginzburg equation. The theory assumes the electric polarization near the surface is not uniform and differs from the bulk value. We found that the crystal lattices of lead titanate and barium titanate relaxes towards outside by X-ray measurements with the use of a simple model. We pointed out that the size effect should be caused by the non-homogenous polarization caused by the surface relaxation.We also studied the low-temperature growth of perovskite type ferroelectric films. If we can crystallize the film at low temperatures, we can obtain film composed of very small particles. The phase transition temperatures of such small particle should be lower than that of bulk crystals by the size effect. The dielectric constant of the film is expected to be larger than that of bulk material. We proposed a technique to insert a seeding layer between the film and the substrate. For example, insertion of PbTiOィイD23ィエD2 seeding layer made it possible to obtain a well crystallized film at very low temperature such as 450℃.
期刊论文(0)
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会议论文
Hisao Suzuki: "Low Temperature Processing of Pb{(Mg_<1/3>Nb_<2/3>)_<0.9>Ti_<0.1>}O_3 Thin Film by Sol-Gel-Casting"Ferroelectrics. Vol.231. 231-236 (1999)
Hisao Suzuki:“通过溶胶凝胶铸造法低温加工 Pb{(Mg_<1/3>Nb_<2/3>)_<0.9>Ti_<0.1>}O_3 薄膜”铁电体。
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Tomio Hirano: "Effect of Seeding Layers on Preparation of PLZT Thin Films by Sol-Gel Method"Kor. J. Ceram.. Vol.5. 50-54 (1999)
Tomio Hirano:“晶种层对溶胶-凝胶法制备 PLZT 薄膜的影响”Kor。
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共 26 条
    Study of effect of atmospheric pressure plasma on biological specimen by using in situ real time electron spin resonance technique
    • 批准号:
      24654191
    • 项目类别:
      Grant-in-Aid for Challenging Exploratory Research
    • 资助金额:
      $2.5万
    • 财政年份:
      2012
    • 负责人:
      ISHIKAWA Kenji
    • 依托单位:
    Surface Relaxation and Size Effects in Perovskite Type Ferroelectrics
    Size Effect in Ferroelectric Thin Films Prepared by Atomic Layr Controlled Growth
    • 批准号:
      07650367
    • 项目类别:
      Grant-in-Aid for Scientific Research (C)
    • 资助金额:
      $1.28万
    • 财政年份:
      1995
    • 负责人:
      ISHIKAWA Kenji
    • 依托单位:
    Low-Hysteresis and Lineear Piezoelectric Actuator made from Ultra-fine Particles
    海外基金