Abstract
In this study, BaTi1-mZrmO3-4.5 mol.% Gd2O3-2.0 mol.% SiO2 ceramics with different Zr/Ti ratios and MgO contents were prepared via solid-state reaction. The MgO addition decreased the densification temperatures of the ceramics and increased the second phase Ba2GdZrO5.5 content. The temperature coefficient of capacitance curves of the ceramics had an almost linear variation with temperature, with negative temperature coefficients. With the increase of the Zr4+/Ti4+ ratio and MgO content, the temperature coefficient of capacitance rotated counter clockwise due to the lower Tm temperature, and a smaller tan δ and a higher electrical resistance were obtained at room temperature. The Zr4+ ion replacement and MgO addition reduced the \({\text{Ti}}^\prime_{{\text{Ti}}}\) concentrations, and therefore, lessened the hopping conduction between Ti4+ and Ti3+ ions, while excess MgO produced \({V_O^{ \bullet \bullet }}\) and had an opposing effect. Additionally, larger amounts of MgO led to smaller grain sizes, and thus, more insulating grain boundaries. The change in the dielectric constant with the bias field, a typical nonlinear dielectric behavior, decreased with increasing MgO content and Zr4+/Ti4+ ratio. For BaTi0.70Zr0.30O3 ceramics with additives of 6 mol.% MgO, 4.5 mol.% Gd2O3, and 2 mol.% SiO2, the dielectric constant changed by a minimum value of 0.37% under a bias of 2.5 kV/mm.
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Wang, SF., Hsu, YF., Chang, CW. et al. Dielectric Properties and DC Bias Characteristics of BaTi1-mZrmO3-x mol.% MgO-4.5 mol.% Gd2O3-2 mol.% SiO2 Ceramics. J. Electron. Mater. 50, 5946–5954 (2021). https://doi.org/10.1007/s11664-021-09103-3
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DOI: https://doi.org/10.1007/s11664-021-09103-3