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首页> 外文期刊>Crystal growth & design >Effect of Structural Modification by MnO2 Addition on the Electrical Properties of Lead Free Flux Grown (Na0.5Bi0.5)TiO3-(K0.5Bi0.5)TiO3 Single Crystals
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Effect of Structural Modification by MnO2 Addition on the Electrical Properties of Lead Free Flux Grown (Na0.5Bi0.5)TiO3-(K0.5Bi0.5)TiO3 Single Crystals

机译：MnO2添加对结构的改性对生长（Na0.5Bi0.5）TiO3-（K0.5Bi0.5）TiO3单晶无铅焊剂电性能的影响

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摘要

In this study, single crystals of 0.25 mol % Mn-modified lead-free (Na0.5Bi0.5)TiO3-(K0.5Bi0.5)TiO3 grown by self-flux method are investigated. The crystal shows coexistence of tetragonal and cubic phases in the perovskite structure. EDAX analysis shows a uniform Mn doping for the BNKMT single crystals. The depolarization temperature (T-d) and the temperature of dielectric constant maximum (T-m) are found to be 175 and 310 degrees C respectively. The complex impedance plot exhibited single impedance semicircle identified over the frequency range of 200 Hz to 2 MHz. The ac conductivity results indicate activation energies in the range of 0.035-0.040 eV at low temperatures and 0.1-0.5 eV at high temperatures. The piezoelectric charge coefficient d33 reaches a maximum of 202 pC/N. Nonswitchable ferroelectric hysteresis showing a strong anomaly along the polarization axis with temperature are observed. Fatigue-free behavior up to 10,000 electrical cycles is observed, making the crystals favorable for high precision sensors, capacitors, and actuator applications.
机译：在这项研究中，研究了通过自熔法生长的0.25 mol％Mn改性的无铅（Na0.5Bi0.5）TiO3-（K0.5Bi0.5）TiO3单晶。晶体显示钙钛矿结构中四方相和立方相共存。 EDAX分析显示BNKMT单晶具有均匀的Mn掺杂。发现去极化温度（T-d）和介电常数最大值（T-m）分别为175℃和310℃。复数阻抗图在200 Hz至2 MHz的频率范围内显示出单个阻抗半圆。交流电导率结果表明，活化能在低温下为0.035-0.040 eV，在高温下为0.1-0.5 eV。压电电荷系数d33最大为202pC / N。观察到不可切换的铁电磁滞现象，该极化现象随温度沿极化轴表现出很强的异常。观察到高达10,000个电周期的无疲劳行为，使该晶体非常适合高精度传感器，电容器和执行器应用。

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