Effect of MgO addition on the microstructure and dielectric properties of BaTiO3 ceramics

Effects of MgO and Rare-Earth Oxides (Y2O3, Yb2O3, Dy2O3) on the Structural Characteristics and Electrical Properties of BaTiO3

“…This was performed to neglect the effect of pores on the dielectric and electrical properties of the sintered specimens, which will be discussed in Section 3.2. The ), which has a slightly smaller ionic radius than that of the Y 3+ (0.9 Å, CN = 6) and Dy 3+ ions (0.912 Å, CN = 6), was effectively inhibited by MgO in the specimens cosintered with MgO-Yb2O3, resulting in the observed pseudo-cubic structure [27]. For the sintered specimens doped with MgO, MgO is substituted at the Ti site of BT due to the ionic radius of Mg 2+ ions (0.72 Å) being similar to that of Ti 4+ ions (0.605 Å) (Equation ( 3)), and the positively charged oxygen vacancy induces the deformation of BT from a tetragonal to a pseudo-cubic structure [12,27,28].…”

“…01-075-0212), evidenced by the fusion of the (002) and ( 200) planes in the XRD patterns. The diffusion of the Yb 3+ ion (0.87 Å, CN = 6), which has a slightly smaller ionic radius than that of the Y 3+ (0.9 Å, CN = 6) and Dy 3+ ions (0.912 Å, CN = 6), was effectively inhibited by MgO in the specimens co-sintered with MgO-Yb 2 O 3 , resulting in the observed pseudo-cubic structure [27]. For the sintered specimens doped with MgO, MgO is substituted at the Ti site of BT due to the ionic radius of Mg 2+ ions (0.72 Å) being similar to that of Ti 4+ ions (0.605 Å) (Equation ( 3)), and the positively charged oxygen vacancy induces the deformation of BT from a tetragonal to a pseudo-cubic structure [12,27,28].…”