Dulian Piotr, Bąk Wojciech, Piz Mateusz, Garbarz-Glos Barbara, Sachuk Olena V, Wieczorek-Ciurowa Krystyna, Lisińska-Czekaj Agata, Czekaj Dionizy
Faculty of Chemical Engineering and Technology, Cracow University of Technology, 24 Warszawska St., 31-155 Cracow, Poland.
Institute of Technology, Pedagogical University of Cracow, 2 Podchorążych St., 30-084 Kraków, Poland.
Materials (Basel). 2021 Mar 3;14(5):1187. doi: 10.3390/ma14051187.
In this study, ceramic CaCuTiO (CCTO) and CaCuMgTiO solid solutions in which 0.1 ≤ x ≤ 0.5 were prepared by the mechanochemical method, realized by a high-energy ball milling technique. The effects of the Mg ion concentration and sintering time on the dielectric response in the prepared ceramics were investigated and discussed. It was demonstrated that, by the use of a sufficiently high energy of mechanochemical treatment, it is possible to produce a crystalline product after only 2 h of milling the mixture of the oxide substrates. Both the addition of magnesium ions and the longer sintering time of the mechanochemically-produced ceramics cause excessive grain growth and significantly affect the dielectric properties of the materials. The X-ray diffraction (XRD) analysis showed that all of the as-prepared solid solutions, CaCuMgTiO (0.0 ≤ x ≤ 0.5), regardless of the sintering time, exhibit a cubic perovskite single phase. The dielectric study showed two major contributions associated with the grains and the grain boundaries. The analysis of the electric modules of these ceramics confirmed the occurrence of Maxwell-Wagner type relaxation, which is dependent on the temperature.
在本研究中，通过机械化学方法制备了陶瓷CaCuTiO（CCTO）和CaCuMgTiO固溶体（其中0.1≤x≤0.5），该方法通过高能球磨技术实现。研究并讨论了Mg离子浓度和烧结时间对所制备陶瓷介电响应的影响。结果表明，通过使用足够高的机械化学处理能量，仅在研磨氧化物基体混合物2小时后就有可能产生结晶产物。镁离子的添加以及机械化学制备陶瓷的较长烧结时间都会导致晶粒过度生长，并显著影响材料的介电性能。X射线衍射（XRD）分析表明，所有制备的固溶体CaCuMgTiO（0.0≤x≤0.5），无论烧结时间如何，均呈现立方钙钛矿单相。介电研究表明有两个主要贡献与晶粒和晶界相关。对这些陶瓷电模量的分析证实了麦克斯韦-瓦格纳型弛豫的发生，其取决于温度。
