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首页> 外文期刊>Journal of Materials Research >Structure and temperature-dependent phase transitions of lead-freeBi_(1/2)Na_(1/2)TiO_3-Bi_(1/2)Ki_(1/2)TiO_3-K_(0.5)Na_(0.5)NbO_3piezoceramics
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Structure and temperature-dependent phase transitions of lead-freeBi_(1/2)Na_(1/2)TiO_3-Bi_(1/2)Ki_(1/2)TiO_3-K_(0.5)Na_(0.5)NbO_3piezoceramics

机译：无铅Bi_（1/2）Na_（1/2）TiO_3-Bi_（1/2）Ki_（1/2）TiO_3-K_（0.5）Na_（0.5）NbO_3压电陶瓷的结构和温度相关的相变

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摘要

Structure and phase transitions of (1 - y)((l - x)Bi_(1/2)Na_(1/2)TiO_(3-x)Bi_(1/2)K_(1/2)TiO_3)-yK_(0.5)Na_(0.5)NbO_3 (x; y) piezoceramics (0.1 ≤ x ≤ 0.4; 0 ≤y ≤ 0.05) were investigated by transmission electron microscopy, neutron diffraction, temperature-dependent x-ray diffraction, and Raman spectroscopy. The local crystallographic structure at room temperature (RT) does not change by adding K_(0.5)Na_(0.5)NbO_3 to Bi_(1/2)Na_(1/2)TiO_3-xBi_(1/2)K_(1/2)TiO_3 for x = 0.2 and 0.4. The average crystal structure and microstructure on the other hand develop from mainly long-range polar order with ferroelectric domains to short-range order with polar nanoregions displaying a more pronounced relaxor character. The (0.1; 0) and (0.1; 0.02) compositions exhibit monoclinic Cc space group symmetry, which transform into Cc + PAbm at 185 and 130 °C, respectively. This high temperature phase is stable at RT for the morphotropic phase boundary compositions of (0.1; 0.05) and all compositions with x = 0.2. For the compositions of (0.1; 0) and (0.1; 0.02), local structural changes on heating are evidenced by Raman; for all other compositions, changes in the long-range average crystal structure were observed.
机译：（1-y）（（1-x）Bi_（1/2）Na_（1/2）TiO_（3-x）Bi_（1/2）K_（1/2）TiO_3）-yK_的结构和相变通过透射电子显微镜，中子衍射，随温度变化的x射线衍射和拉曼光谱研究了（0.5）Na_（0.5）NbO_3（x; y）压电陶瓷（0.1≤x≤0.4; 0≤y≤0.05）。通过向Bi_（1/2）Na_（1/2）TiO_3-xBi_（1/2）K_（1/2）添加K_（0.5）Na_（0.5）NbO_3不会改变室温（RT）下的局部晶体结构x = 0.2和0.4的）TiO_3。另一方面，平均晶体结构和微观结构主要从具有铁电畴的远程极性有序发展到极性纳米区域表现出更明显的弛豫特性的短程有序。 （0.1; 0）和（0.1; 0.02）组合物表现出单斜Cc空间群对称性，分别在185和130°C时转变为Cc + PAbm。对于（0.1； 0.05）和所有x = 0.2的变质相边界成分，该高温相在室温下稳定。对于（0.1； 0）和（0.1； 0.02）的组成，拉曼证明了加热时的局部结构变化。对于所有其他组成，观察到远程平均晶体结构的变化。

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  • 来源
    《Journal of Materials Research》 |2012年第19期|p.2466-2478|共13页
  • 作者

    Eva-Maria Anton; Ljubomira Ana Schmitt; Manuel Hinterstein; Joe Trodahl; Ben Kowalski; Wook Jo; Hans-Joachim Kleebe; Jiirgen Rodel; Jacob L. Jones;

  • 作者单位

    Institute of Materials Science, Technische Universitdt Darmstadt, 64287 Darmstadt, Germany;

    Institute of Applied Geosciences, Technische Universitdt Darmstadt, 64287 Darmstadt, Germany;

    Institut fuer Werkstoffwissenschaft, Technische Universitdt Dresden, 01069 Dresden, Germany;

    MacDiarmid Institute of Advanced Materials and Nanotechnology, Victoria University, Wellington, New Zealand;

    Department of Materials Science & Engineering, University of Florida, Gainesville, Florida 32611;

    Institute of Materials Science, Technische Universitdt Darmstadt, 64287 Darmstadt, Germany;

    Institute of Applied Geosciences, Technische Universitdt Darmstadt, 64287 Darmstadt, Germany;

    Institute of Materials Science, Technische Universitdt Darmstadt, 64287 Darmstadt, Germany;

    Department of Materials Science & Engineering, University of Florida, Gainesville, Florida 32611;

  • 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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