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21.
Multiferroic properties and exchange bias(EB) in Bi1-xSrxFeO3(x = 0–0.6) ceramics synthesized by a modified Pechini method are investigated. Sr concentration dependence of structure distorting, ferroelectric properties, and dielectric properties were studied at room temperature. Appropriate Sr doping(x = 0.05–0.2) has been found to decrease the conductivity, enhance ferroelectric properties and give rise to high dielectric constant. Compared with antiferromagnetic BiFeO3 compound, BSFO-x(0 ≤ x ≤ 0.4) ceramics show weak ferromagnetism at room temperature, and their exchange bias field and vertical magnetization shift are observed and exhibit a strong dependence on the content of Sr. This observed EB effect which keeps stable in BSFO ceramics at 10 K tend to vanish at room temperature with Sr concentration over 0.4. 相似文献
22.
双磁场IMPS粒子速度测试系统 总被引:10,自引:0,他引:10
动载下材料横向行为的直接实时测量,对于全面了解材料响应及其机理有重要意义。本文介绍了自行研制的双磁电磁IMPS粒子速度测试系统的工作原理、结构性能及初步实验结果。该装置基于Faraday电磁感应定律,可实时测量多点斜碰撞产生的纵向和横向质点速度波形,从而解决了压剪炮试验中的s波测量问题。 相似文献