厚度剪切模式铌酸锂基复合材料的磁电性能优化

发布时间：2018-11-05 13:34

【摘要】：通过弹性力学方法计算了基于厚度剪切模式的铌酸锂(LiNbO_3)基磁电复合材料磁电系数与铌酸锂晶体切型、磁致伸缩材料种类、材料尺寸的关系,并讨论了两种不同复合结构边界条件对剪切磁电性能的影响.计算结果表明:(xzt)30°切型铌酸锂单晶具有最大剪切压电系数dp15,制作成的复合材料具有最大剪切磁电系数αE15;通过两相尺寸优化,伸缩-剪切模式Terfenol-D/LiNbO_3复合材料最大剪切磁电系数为24.13 V/(cm·Oe),剪切-剪切模式Metglas/LiNbO_3复合材料最大剪切磁电系数为11.46V/(cm·Oe).实验结果与理论计算规律相符,研究结果为剪切磁电复合结构的设计、剪切模式铌酸锂切型的选择优化提供了指导,有望利用高机械品质因数Q_m值的铌酸锂单晶设计高频谐振磁场探测器.
[Abstract]:The relationship between the magnetoelectric coefficients of lithium niobate (LiNbO_3) matrix magnetoelectric composites based on thickness shear mode and the cut type of lithium niobate crystal, the type of magnetostrictive materials and the size of the materials are calculated by means of elastic method. The effects of two different boundary conditions on the shear magnetoelectric properties are discussed. The results show that: (xzt) 30 掳tangent lithium niobate single crystal has the maximum shear piezoelectric coefficient (dp15,) and the maximum shear magnetoelectric coefficient (伪 E15). The maximum shear magnetoelectric coefficient of extension-shear mode Terfenol-D/LiNbO_3 composite is 24.13 V / (cm Oe), by two phase size optimization. Maximum Shear Magnetoelectric coefficient of Shear Mode Metglas/LiNbO_3 Composites is 11.46V/ (cm Oe). The experimental results are consistent with the theoretical calculation rules. The results provide guidance for the design of the shear magnetoelectric composite structure and the selection and optimization of the shear mode lithium niobate shear type. It is expected that the high frequency resonant magnetic field detector can be designed by using lithium niobate single crystal with high mechanical quality factor (QSM).
【作者单位】：清华大学材料学院新型陶瓷与精细工艺国家重点实验室;
【基金】：国家自然科学基金(批准号:51402164)资助的课题~~
【分类号】：TB33

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