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首页> 外文期刊>Journal of materials science >Enhanced electrical properties and large electrocaloric effect in lead-free Ba_(0.8)Ca_(0.2)Zr_xTi_(1-x)O_3 (x=0 and 0.02) ceramics
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Enhanced electrical properties and large electrocaloric effect in lead-free Ba_(0.8)Ca_(0.2)Zr_xTi_(1-x)O_3 (x=0 and 0.02) ceramics

机译：增强的电气性能和铅Ba_（0.8）CA_（0.2）Zr_xti_（1-x）O_3（x = 0和0.02）陶瓷中的大电致效应

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摘要

The effects of 2% Zr introduction in Ba_(0.8)Ca_(0.2)TiO_3 (BCT) system on its electrical and electrocaloric properties was investigated. BCT and Ba_(0.8)Ca_(0.2)Zr_(0.02)Ti_(0.98)O_3 (BCZT) ceramics synthesized by solid-state processing were crystallized in a pure perovskite phase with a group space P4mm. After Zr insertion, the enhanced dielectric constant was obtained around the Curie temperature (T_c) in BCZT ceramic (ε_r = 6330 at T_c = 388 K) compared to BCT ceramic (ε_r = 5080 at T_c=388.6 K). Moreover, the large-signal piezoelectric coefficient (d_(33)*) was improved from 270 to 310 pm/V in BCT and BCZT ceramics, respectively, under a moderate electric field of 25 kV/cm. The electrocaloric effect was determined via indirect and direct methods. In the indirect approach, the electrocaloric temperature change (AT) was calculated via Maxwell relation, and the measured ferroelectric polarization P (E, T) extracted from the P-E curves recorded at 24 kV/cm. The maximum values of △T=0.68 K and the electrocaloric responsivity ζ =0.283 K mm/kV obtained at 385 K in BCZT ceramic were found to be higher than those observed in BCT ceramic (△T=0.37 K and ζ= 0.154 K mm/kV at 387 K). In the direct approach, △T was measured utilizing a modified high-resolution calorimeter at 14 kV/cm. As the direct method is more sensitive to the latent heat, it provided larger values for smaller applied field, i.e., AT= 0.474 and 0.668 K for BCT and BCZT ceramics, respectively. A significant ζ of 0.477 K mm/kV was obtained in BCZT at 385 K and 14 kV/cm that matches the values found in lead-based materials. These results suggest that BCZT lead-free ceramics could have an excellent potential to be used in solid-state refrigeration applications.
机译：研究了2％ZR引入的Ba_（0.8）Ca_（0.2）TiO_3（BCT）系统对其电气和电热性能的影响。 BCT和通过固态加工合成的通过固态处理合成的BA_（0.8）CA_（0.2）ZR_（0.02）TI_（0.02）TI_（0.98）O_3（BCZT）陶瓷在纯的钙钛矿相中与基团空间P4mm结晶。与BCT陶瓷（T_C = 388.6K）相比，在BCZT陶瓷（T_C = 388K）中的BCZT陶瓷（ε_R= 6330）中的居里温度（T_C）周围获得增强的介电常数。此外，在25kV / cm的中等电场下，分别在BCT和BCZT陶瓷中改善了大信号压电系数（D_（33）*）在BCT和BCZT陶瓷中提高了270至310pm / v。通过间接和直接方法测定电热效应。在间接方法中，通过麦克斯韦关系计算电热温度变化（AT），并从记录在24kV / cm的P-E曲线中提取的测量的铁电偏振P（E，T）。发现在BCZT陶瓷中的385k处获得的χT= 0.68k和电热响应率的最大值和电热量响应率ζ= 0.283kmm / kV高于BCT陶瓷中观察到的（△T= 0.37k和ζ= 0.154kmm） / kV 387 k）。在直接方法中，利用14kV / cm的改性的高分辨率量热计测量△T.随着直接方法对潜热更敏感，它分别为较小的施加的场，即BCT和BCZT陶瓷分别为较小的施加的场，即= 0.474和0.668K提供了更大的值。在BCZT下，在385 k和14kV / cm中获得显着的0.477km / kV，其与铅基材料中发现的值匹配。这些结果表明，BCZT无铅陶瓷可具有优异的潜力，可用于固态制冷应用。

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  • 来源
    《Journal of materials science》 |2020年第19期|17018-17028|共11页
  • 作者

    Soukaina Merselmiz; Zouhair Hanani; Said Ben Moumen; Aleksander Matavz; Daoud Mezzane; Nikola Novak; Zahra Abkhar; Lahoucine Hajji; Mbarek Amjoud; Yaovi Gagou; Khalid Hoummada; Dejvid Cresnar; Zdravko Kutnjak; Brigita Rozic;

  • 作者单位

    IMED-Lab Cadi Ayyad University. 40000 Marrakesh Morocco;

    IMED-Lab Cadi Ayyad University. 40000 Marrakesh Morocco ICMCB University of Bordeaux 33600 Pessac France;

    IMED-Lab Cadi Ayyad University. 40000 Marrakesh Morocco;

    Jozef Stefan Institute 1000 Ljubljana Slovenia;

    IMED-Lab Cadi Ayyad University. 40000 Marrakesh Morocco;

    Jozef Stefan Institute 1000 Ljubljana Slovenia;

    IMED-Lab Cadi Ayyad University. 40000 Marrakesh Morocco;

    IMED-Lab Cadi Ayyad University. 40000 Marrakesh Morocco;

    IMED-Lab Cadi Ayyad University. 40000 Marrakesh Morocco;

    LPMC University of Picardy Jules Verne 80039 Amiens France;

    IM2NP Aix-Marseille University UMR 7334 13397 Marseille France;

    Jozef Stefan Institute 1000 Ljubljana Slovenia;

    Jozef Stefan Institute 1000 Ljubljana Slovenia;

    Jozef Stefan Institute 1000 Ljubljana Slovenia;

  • 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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