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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructure, ferroelectric, and piezoelectric properties of (1-x-y)Bi_(0.5)Na_(0.5)TiO_3-xBaTiO_3-yBi_(0.5)Ag_(0.5)TiO_3 lead-free ceramics
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Microstructure, ferroelectric, and piezoelectric properties of (1-x-y)Bi_(0.5)Na_(0.5)TiO_3-xBaTiO_3-yBi_(0.5)Ag_(0.5)TiO_3 lead-free ceramics

机译：（1-x-y）Bi_（0.5）Na_（0.5）TiO_3-xBaTiO_3-yBi_（0.5）Ag_（0.5）TiO_3无铅陶瓷的微观结构，铁电和压电性能

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摘要

Lead-free (1 -x-y)Bi_(0.5)Na_(0.5)TiO_3-xBaTiO_3-yBi_(0.5)Ag_(0.5)TiO_3 (BNT-BT-BAT-x/y, x = 0-0.10, y=0-0.075) piezoelectric ceramics were synthesized by conventional oxide-mixed method. The microstructure, ferroelectric, and piezoelectric properties of the ceramics were investigated. Results show that a mor-photropic phase boundary (MPB) between rhombohedral and tetragonal phases of BNT-BT-BAT-x/0.04 ceramics is formed at x = 0.06-0.08. The addition of BAT has no obvious change on the crystal structure of BNT-BT ceramics while it causes the grain size of the ceramics to become more homogenous. Near the MPB, the ceramics with x = 0.06 and y= 0.05-0.06 possess optimum electrical properties: P_~42.5 μC/cm~2, E_c ~ 32.0 kV/cm, d_(33) ~172 pC/N, k_p~32.6%, and k_t~52.6%. The temperature dependences of k_p and polarization versus electric hysteresis loops reveal that the depolarization temperature (T_d) of BNT-BT-BAT-0.06/y ceramics decreases with increasing y. In addition, the polar and non-polar phases may coexist in the BNT-BT-BAT-x/y ceramics above T_d.
机译：无铅（1-xy）Bi_（0.5）Na_（0.5）TiO_3-xBaTiO_3-yBi_（0.5）Ag_（0.5）TiO_3（BNT-BT-BAT-x / y，x = 0-0.10，y = 0-通过常规的氧化物混合法合成0.075％的压电陶瓷。研究了陶瓷的微观结构，铁电和压电性能。结果表明，BNT-BT-BAT-x / 0.04陶瓷的菱形和四方相之间的正相相界（MPB）在x = 0.06-0.08处形成。 BAT的添加对BNT-BT陶瓷的晶体结构没有明显的影响，但会导致陶瓷的晶粒尺寸变得更加均匀。在MPB附近，x = 0.06和y = 0.05-0.06的陶瓷具有最佳电性能：P_〜42.5μC/ cm〜2，E_c〜32.0 kV / cm，d_（33）〜172 pC / N，k_p〜32.6 ％，和k_t〜52.6％。 k_p和极化与电滞回线的温度相关性表明，BNT-BT-BAT-0.06 / y陶瓷的去极化温度（T_d）随着y的增加而降低。另外，极性相和非极性相可以在T_d以上的BNT-BT-BAT-x / y陶瓷中共存。

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