电介质
材料科学
凝聚态物理
四方晶系
居里温度
铁磁性
磁化
铁电性
钨
多铁性
铁磁材料性能
化学
晶体结构
磁场
物理
结晶学
光电子学
冶金
量子力学
作者
Xuzhong Zuo,Dongpo Song,You‐Xuan Zheng,Zhenzhen Hui,Teng Guo,Dong Wei,Enjie He,Yanfu Qin,Banggui Guan,Jie Yang,Xuebin Zhu,Jianming Dai
标识
DOI:10.1016/j.rinp.2023.107230
摘要
The structural, magnetic, ferroelectric, dielectric, magneto-dielectric and optical properties of W/Co co-substituted tungsten bronze Ba4Sm2Fe2Nb8-3x(W2Co)xO30 (0 ≤ x ≤ 0.3) ceramics were studied in detail. All the samples can be indexed with the tetragonal structure with the space group of P4bm. The room-temperature ferromagnetism with rather high ferromagnetic Curie temperature Tc was obtained in all compositions. The co-doping of W/Co ions obviously optimized the ferromagnetism and ferroelectricity. The composition x = 0.2 showed a superior multiferroicity with the remnant magnetization Mr of 0.15 emu/g and the remnant polarization Pr of 2.1μC/cm2 as well as the Tc of 886 K. The low-temperature relaxation was related to the thermal process of oxygen vacancies, while the another one around 300 K was ascribed to the localized hopping of electrons. The relative increment of magneto-dielectric constant (MDC) obeyed with the square term of magnetization in Ginzburg-Landau theory, implying the existence of intrinsic magneto-electric coupling effect. A relatively large MDC of 0.17 % was achieved in pure sample. In addition, two direct inter-band transitions with the narrow band gaps of ∼2.0 eV and ∼2.5 eV were demonstrated.
科研通智能强力驱动
Strongly Powered by AbleSci AI