Topochemical synthesis and structural characteristics of orientation-controlled (Bi0.5Na0.5)0.94 Ba0.06TiO3 perovskite microplatelets

被引:5
作者
Ma, Yaqing [1 ]
Xie, Hang [1 ]
Sun, Yuan [1 ]
Kou, Qiangwei [1 ]
Liu, Linjing [1 ]
Yang, Bin [1 ]
Cao, Wenwu [1 ,2 ,3 ]
Chang, Yunfei [1 ]
Li, Fei [4 ,5 ]
机构
[1] Harbin Inst Technol, Funct Mat & Acoustoopt Instruments Inst, Yikuang St 2, Harbin 150080, Heilongjiang, Peoples R China
[2] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA
[3] Penn State Univ, Dept Math, University Pk, PA 16802 USA
[4] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Educ Minist, Elect Mat Res Lab,Key Lab, Xian 710049, Shaanxi, Peoples R China
[5] Xi An Jiao Tong Univ, Sch Elect Sci & Engn, Xian 710049, Shaanxi, Peoples R China
来源
MICROSTRUCTURES | 2022年 / 2卷 / 02期
基金
中国国家自然科学基金;
关键词
TEMPLATED GRAIN-GROWTH; LEAD-FREE PIEZOCERAMICS; ELECTRICAL-PROPERTIES; PIEZOELECTRIC PROPERTIES; CONVERSION; CERAMICS; FIELD; AURIVILLIUS; TEMPERATURE;
D O I
10.20517/microstructures.2021.13
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Two-dimensional perovskite microcrystals have important applications in various electronic and energy devices. In this work, 0.94(Bi0.5Na0.5)TiO3-0.06BaTiO(3) (0.94BNT-0.06BT) microplatelets with a pure perovskite structure, (h00) orientation, good crystallinity and remarkable electromechanical strain are fabricated through topochemical microcrystal conversion from Aurivillius-structured Bi4.5Na0.5Ti4O15 precursors. The formation process of the Bi4.5Na0.5Ti4O15 precursors and the topochemical conversion mechanism of the 0.94BNT-0.06BT target are systematically studied. Intermediate phases, such as Bi4Ti3O12 and Bi8.5Na0.5Ti7O27, appear before the formation of pure Bi4.5Na0.5Ti4O15 at 950 degrees C in a NaCl molten salt. For the topochemical microcrystal conversion process, although the Aurivillius to perovskite structural transformation is completed at 900 degrees C, the original single-crystal precursor platelets are replaced by polycrystalline aggregates because of extensive exfoliation and disintegration events. Such microstructural damage is healed by recrystallization via Ostwald ripening through further heating to produce single-crystal 0.94BNT-0.06BT microplatelets with flat surfaces, regular shapes and homogenous distributions of Bi, Na, Ba, Ti and O at 1150 degrees C. Both labyrinth and stripe-like domains can be detected from these microplatelets, suggesting the coexistence of both rhombohedral and tetragonal phases, in agreement with the X-ray diffraction analysis. Furthermore, local electromechanical strain with an amplitude of similar to 600 pm (at 10 V) is observed from the platelets along the <001>(c) direction.
引用
收藏
页数:11
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