[001]-texturing of(K,Na)NbO_(3)-based piezoceramics with a pseudocubic structure and their application to piezoelectric devices  

作　　者：Su-Hwan Go Seok-Jung Park Seung-Hyun Kim Seok-June Chae Eun-Ji Kim Geun-Su Lee Sahn Nahm 

机构地区：[1]Department of Materials Science and Engineering,Korea University,Seoul,02841,Republic of Korea

出　　处：《Journal of Materiomics》2024年第3期632-642,共11页无机材料学学报（英文）

基　　金：supported by a National Research Foundation(NRF)of Korea grant funded by the Korean government(MSIT)(No.RS-2023-00254689).

摘　　要：0.96(K_(0.5)Na_(0.5-z)Li_(z))(Nb_(0.92)Sb_(0.08))O_(3)-0.04(Ca_(0.5)Sr_(0.5))ZrO_(3)[(KN_(0.5-z)L_(z))NS-CSZ]piezoceramics(0≤z≤0.04)were aligned in the[001]orientation using 3%(in mole)NaNbO_(3)templates with a large Lotgering factor(>97%).Their crystal structures transformed from the orthorhombic-pseudocubic(O-P)structure to the orthorhombic-tetragonal-pseudocubic(O-T-P)structure with an increasing z.The P structure was interpreted as a rhombohedral R3m structure.The piezoelectricity of the compositions increased after[001]-texturing,and the enhancement was proportional to the O phase quantity.The composition(z=0.03)exhibited the highest piezoelectric constant(d_(33);670 pC/N)and electromechanical coupling factor(k_(p);0.56).Piezoelectric energy harvesters were produced using the untextured and textured samples(z=0.03).The textured harvester delivered a large power density of 26.6 mW/mm^(3),which was larger than that of the untextured harvester owing to the enhanced kp and d_(33)×g_(33) of the textured piezoceramic.A multilayer actuator was produced using the textured sample(z=0.03),and it exhibited a large acceleration(44.2 G)and displacement(±3,730 mm)at±25 V.Therefore,the[001]-textured(KN_(0.47)L_(0.03))NS-CSZ piezoceramic is suitable for piezoelectric energy harvesters and actuators.

关 键 词：KNN-Based piezoceramic LEAD-FREE Energy harvester Actuator Reactive template grain growth 

分 类 号：TQ174.1[化学工程—陶瓷工业]