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首页> 外文期刊>Journal of Materials Research >Perovskite Crystallization Kinetics And Dielectric Properties Of The Pmn-pt Films Prepared By Polymer-modified Sol-gel Processing
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Perovskite Crystallization Kinetics And Dielectric Properties Of The Pmn-pt Films Prepared By Polymer-modified Sol-gel Processing

机译：聚合物改性溶胶-凝胶法制备的Pmn-pt薄膜的钙钛矿结晶动力学和介电性能

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摘要

Pb(Mg_(1/3),Nb_(2/3))O_3-PbTiO_3 (PMN-PT, 43% PT) thin films have been developed by modified sol-gel processing with polyvinylpyrrolidone (PVP) as a modifier and lead nitrate as a lead source. With PVP modification, perovskite phase was directly crystallized from amorphous film matrix at a temperature as low as 430 ℃, and the crystallinity was significantly enhanced. Kinetics studies show that the crystallization process is controlled by heat transfer phenomena at the annealing temperatures ≤460 ℃. At higher annealing temperatures (550-700 ℃), it is a diffusion-controlled reaction with an activation energy of 167.7 kJ/mol, almost two times lower than that for the films without PVP modification. The promotion mechanism of perovskite crystallization by PVP addition has been discussed accordingly. The resultant films consisted of nanocrystallines and exhibited relaxor-like dielectric behavior, although the composition of the films located in normal ferroelectrics.
机译：通过以聚乙烯吡咯烷酮（PVP）为改性剂和硝酸铅的改性溶胶-凝胶工艺开发了Pb（Mg_（1/3），Nb_（2/3））O_3-PbTiO_3（PMN-PT，43％PT）薄膜作为主要来源。通过PVP改性，钙钛矿相在430℃以下的温度下直接从非晶膜基质中结晶，结晶度显着提高。动力学研究表明，在≤460℃的退火温度下，结晶过程受传热现象的控制。在较高的退火温度（550-700℃）下，它是扩散控制的反应，其活化能为167.7 kJ / mol，几乎是未经PVP改性的薄膜的两倍。相应地讨论了通过添加PVP促进钙钛矿结晶的机理。所得膜由纳米晶体组成，并表现出弛豫样的介电性能，尽管膜的组成位于普通铁电体中。

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  • 来源
    《Journal of Materials Research》 |2009年第4期|1576-1584|共9页
  • 作者

    Z.H. Du; T.S. Zhang; M.M. Zhu; J. Ma;

  • 作者单位

    Temasek Laboratories, Nanyang Technological University, Singapore 639798;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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