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首页> 外文期刊>Journal of Applied Physics >Structural phase transitions in Ti-doped Bi_(1-x)Nd_xFeO_3 ceramics
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Structural phase transitions in Ti-doped Bi_(1-x)Nd_xFeO_3 ceramics

机译：掺钛Bi_（1-x）Nd_xFeO_3陶瓷的结构相变

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Recently, it was demonstrated that donor doping with Ti on the B-site significantly reduces the conductivity in Bi_(0.85)Nd_(0.15)FeO_3 ceramics [Kalantari et al., Adv. Funct. Mater. 21, 3737 (2011)]. In this contribution, the phase transitions as a function of Nd concentration are investigated in 3% Ti doped Bi_(1-x)Nd_xFeO_3 ceramics. Paraelectric (PE) to ferroelectric (FE) transitions were observed for compositions with x ≤ 0.125 which manifested themselves as peaks in permittivity. In contrast, PE to antiferroelectric (AFE) transitions for 0.15 ≤ x ≤ 0.20 gave rise to a step-like change in the permittivity with x = 0.25 exhibiting no sharp anomalies and remaining PE until room temperature. The large volume change at the PE to FE/AFE transitions, reported by Levin and co-workers [Phys. Rev. B 81, 020103 (2011)] and observed here by dilatometry, coupled with their first-order character constrain the transitions to occur uniformly throughout the material in an avalanche-like manner. Hence, the anomalies in DSC, permittivity and thermal expansion occur over a commen-surately narrow temperature interval. However, despite the large volume change and eye-catching anomalies in DSC, the latent heats for the transitions in Ti-doped Bi_(1-x)Nd_xFeO_3 are similar to Pb(Zr,Ti)O_3 (1-3 kJ/mol) with each an order of magnitude greater than BaTiO_3 (～0.2 kJ/mol). A broad frequency dependent dielectric anomaly of unknown origin in the temperature range 250-450 ℃ was also observed in all samples.
机译：最近，已证明在B位上用Ti供体掺杂显着降低了Bi_（0.85）Nd_（0.15）FeO_3陶瓷中的电导率[Kalantari等人，Adv.Chem.Soc。，1992，3，3]。功能母校21，3737（2011）]。在此贡献中，研究了3％Ti掺杂的Bi_（1-x）Nd_xFeO_3陶瓷的相变与Nd浓度的关系。对于x≤0.125的组合物观察到顺电（PE）至铁电（FE）的转变，其表现为介电常数的峰。相反，当0.15≤x≤0.20时，PE到反铁电（AFE）跃迁引起介电常数的阶梯状变化，其中x = 0.25时没有明显的异常现象，并且保留PE直至室温。 Levin及其同事报道了从PE到FE / AFE过渡的大量变化[Phys。 B 81，020103（2011）（Rev. B 81，020103（2011））并在此通过膨胀法观察到，加上它们的一阶特征，使过渡以雪崩状方式均匀地在整个材料中发生。因此，DSC，介电常数和热膨胀的异常在相称狭窄的温度区间内发生。然而，尽管DSC中存在较大的体积变化和引人注目的异常现象，但Ti掺杂的Bi_（1-x）Nd_xFeO_3跃迁的潜热类似于Pb（Zr，Ti）O_3（1-3 kJ / mol）每一个的数量级都大于BaTiO_3（〜0.2 kJ / mol）。在所有样品中，还观察到了在250-450℃温度范围内未知来源的频率依赖性介电异常现象。

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  • 来源
    《Journal of Applied Physics》 |2012年第6期|p.064107.1-064107.7|共7页
  • 作者

    Kambiz Kalantari; Iasmi Sterianou; Derek C. Sinclair; Paul A. Bingham; Jan Pokorny; Ian M. Reaney;

  • 作者单位

    Department of Materials Science and Engineering, University of Sheffield, Mappin St., Sheffield S1 3JD,United Kingdom;

    Department of Materials Science and Engineering, University of Sheffield, Mappin St., Sheffield S1 3JD,United Kingdom;

    Department of Materials Science and Engineering, University of Sheffield, Mappin St., Sheffield S1 3JD,United Kingdom;

    Department of Materials Science and Engineering, University of Sheffield, Mappin St., Sheffield S1 3JD,United Kingdom;

    Department of Materials Science and Engineering, University of Sheffield, Mappin St., Sheffield S1 3JD,United Kingdom;

    Department of Materials Science and Engineering, University of Sheffield, Mappin St., Sheffield S1 3JD,United Kingdom;

  • 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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