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Low temperature sintering of (Ba0.85Ca0.15) (Ti0.90Zr0.10)O3 lead-free piezoceramic with the additive of MnO2
Journal of Electroceramics ( IF 1.7 ) Pub Date : 2021-07-07 , DOI: 10.1007/s10832-021-00250-x
Mulualem Abebe Mekonnen 1 , Mesfin Zewdu Tadesse 1
Affiliation  

Lead-free (Ba0.85Ca0.15) (Ti0.90Zr0.10)O3 (15/10 BCZT) piezoelectric ceramics were prepared by a standard solid solution and sintered at different temperature of 1300 °C and 1500 °C at a time. The 15/10BCZT piezoceramics were prepared at 1300 °C sintering temperature by doping different amount of MnO2.The ceramics show a phase transition from a freoelectric tetragonal phase to a rhombohedral and tetragonal ferroelctric phase and to a single rhombohedral phase with increasing MnO2 content. The addition of MnO2 significantly improves the sinterbility of the 15/10BCZT piezoceramics, and reducing the sintering temperature from 1500 °C to 1300 °C by 200 °C but showing comparable piezoelectric properties. With 0.4 mol% of the dopant, ∼96.5% of the theoretical density of the ceramics was achieved with excellent piezoelectric coefficient d33 ~ 534pC/N, which is nearly equal to the value obtained from the ceramics sintered at 1500 °C which has a piezoelectric coefficient d33 ~ 570pC/N, high density (~ 5.59 g/cm3), maximum remnant polarization (Pr = 24 μC/cm2), relatively large grain size (10.4 μm) and the least coercieve field (Ec = 0.42 kV/mm). However, a high concentration of MnO2 deterioated the properties of the ceramics because of increasing of oxygen vacancies and associated defects. The results indicate that the BCTZ-y mol% MnO2 ceramics are one of the promising lead-free piezoelectric candidates for high temperature applications.



中文翻译:

(Ba0.85Ca0.15)(Ti0.90Zr0.10)O3无铅压电陶瓷与MnO2添加剂的低温烧结

采用标准固溶体制备无铅(Ba 0.85 Ca 0.15 ) (Ti 0.90 Zr 0.10 )O 3 (15/10 BCZT)压电陶瓷,并在1300℃和1500℃不同温度下一次烧结。15/10BCZT压电陶瓷是在1300 °C的烧结温度下通过掺杂不同量的MnO 2制备的。随着MnO 2含量的增加,陶瓷表现出从四方相向菱形和四方铁电相和单菱形相的相变。. MnO 2 的添加显着提高了 15/10BCZT 压电陶瓷的可烧结性,并将烧结温度从 1500 °C 降低到 1300 °C,降低了 200 °C,但表现出相当的压电性能。掺杂量为 0.4 mol% 时,陶瓷的理论密度约为 96.5%,压电系数 d 33 ~ 534pC/N,几乎等于陶瓷在 1500 °C 下烧结获得的值,其具有压电系数 d 33 ~ 570pC/N, 高密度 (~ 5.59 g/cm 3 ), 最大剩余极化 (P r = 24 μC / cm 2 ), 相对较大的晶粒尺寸 (10.4 μm) 和最小的矫顽场 (E c= 0.42 kV/mm)。然而,由于氧空位和相关缺陷的增加,高浓度的MnO 2 会降低陶瓷的性能。结果表明,BCTZ-y mol% MnO 2陶瓷是用于高温应用的有前途的无铅压电候选材料之一。

更新日期:2021-07-08
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