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首页> 外文期刊>Japanese journal of applied physics >Anisotropic Polarization Switching in Tungsten Bronze Ferroelectrics in Binary (Bi_(1/2)Na_(1/2))Nb_2O_6-BaNb_2O_6 System
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Anisotropic Polarization Switching in Tungsten Bronze Ferroelectrics in Binary (Bi_(1/2)Na_(1/2))Nb_2O_6-BaNb_2O_6 System

机译：二元（Bi_（1/2）Na_（1/2））Nb_2O_6-BaNb_2O_6系统中钨青铜铁电体的各向异性极化转换

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摘要

Randomly oriented (1 - x)BaNb_2O_6-x(Bi_(1/2)Na_(1/2))Nb_2O_6 ceramics were prepared by conventional solid state sintering. The ceramics (0.2 ≤ x ≤ 0.7) sintered at 1250℃ consisted of a single phase of a tungsten bronze structure, while the end-member materials did not crystallize into the tungsten bronze structure. The crystal systems of tungsten bronze phases were orthorhombic for 0.2 ≤ x ≤ 0.25 and tetragonal for 0.3 ≤ x ≤ 0.7. The temperatures for the maximum dielectric constant (T_m) measured for orthorhombic crystals were 300 and 190 ℃ for x = 0.2 and 0.25, respectively, and showed no frequency dispersion. However, the T_m for tetragonal crystals was suppressed below 160℃ and showed an obvious frequency dispersion. To evaluate the orientation of spontaneous polarization, (001)- and (hk0)-oriented fiber-textured ceramics were prepared for x = 0.2, 0.25, and 0.3 by slip casting under a strong magnetic field. Clear hysteresis loops of polarization-electric field were observed for (001)-oriented orthorhombic ceramics (x = 0.2 and 0.25) at room temperature, while the polarization induced in the (hk0)-oriented or tetragonal ceramics (x = 0.3) varied proportionally to the external electric field. It was concluded that the tungsten bronze crystals, (1 - x)BaNb_2O_6-x(Bi_(1/2)Na_(1/2))Nb_2O_6 (x = 0.2 and 0.25), are ferroelectric at room temperature with the spontaneous polarization parallel to the c-axis.
机译：通过常规的固态烧结制备无规取向的（1-x）BaNb_2O_6-x（Bi_（1/2）Na_（1/2））Nb_2O_6陶瓷。在1250℃下烧结的陶瓷（0.2≤x≤0.7）由单相的钨青铜结构组成，而端部件材料未结晶为钨青铜结构。钨青铜相的晶体体系为正交晶体，0.2≤x≤0.25，四方晶体为0.3≤x≤0.7。正交晶的最大介电常数（T_m）温度在x = 0.2和0.25时分别为300和190℃，并且没有频散。然而，在160℃以下，四方晶体的T_m受到抑制，并表现出明显的频率色散。为了评估自发极化的取向，在强磁场下通过滑模铸造制备了x = 0.2、0.25和0.3的（001）和（hk0）取向纤维化陶瓷。在室温下，对于（001）取向的正交陶瓷（x = 0.2和0.25），观察到极化电场的清晰磁滞回线，而（hk0）取向或四方陶瓷（x = 0.3）引起的极化成比例地变化。到外部电场。结论是，钨青铜晶体（1-x）BaNb_2O_6-x（Bi_（1/2）Na_（1/2））Nb_2O_6（x = 0.2和0.25）在室温下是铁电的，自发极化平行到c轴

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  • 来源
    《Japanese journal of applied physics》 |2010年第9issue2期|p.09MD12.1-09MD12.4|共4页
  • 作者

    Takayuki Watanabe; Jumpei Hayashi; Kaoru Miura;

  • 作者单位

    Corporate R&D Headquarters, Canon Inc., Ota, Tokyo 146-8501, Japan;

    rnCorporate R&D Headquarters, Canon Inc., Ota, Tokyo 146-8501, Japan;

    rnCorporate R&D Headquarters, Canon Inc., Ota, Tokyo 146-8501, Japan;

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