Effects of Manganese Doping on the Dielectric Properties of Titanium Dioxide Ceramics

Abstract

Dielectric properties of undoped and manganese (Mn)-doped titanium dioxide (TiO 2 ) ceramics were measured by various test methods including impedance spectroscopy techniques. It was found that direct current conductivity and dielectric loss were effectively suppressed by small amount (B0.05 mol%) of Mn doping due to generation of possible electron traps. Further increase of Mn content led to formation of oxygen vacancies and increase of dielectric loss. Increased grain-boundary resistivity was observed as Mn-doping concentration increases, presumably due to segregation of Mn solutes at the grain boundaries. Larger difference between the grain and grain-boundary conductivity gave rise to space charge polarization. It was shown that TiO 2 ceramics with optimum amount of Mn-doping concentration possess good dielectric properties that are suitable for energy storage applications.

Enhanced ferroelectric properties and thermal stability of Mn‐doped 0.96(Bi0.5 Na0.5)TiO3‐0.04BiAlO3 ceramics

“…Accordingly, the introduction of Mn with the concentration below 0.7 mol% into 0.96BNT–0.04BA ceramics results in the decrease in tanδ. However, further addition of Mn might generate additional oxygen vacancies that could lead to the increase in tanδ according to the following equation: . The frequency dispersion in the unpoled ceramics appears from room temperature up to ~260°C.…”

Enhancement of open-circuit voltage on organic photovoltaic devices by Al-doped TiO2 modifying layer produced by sol–gel method

“…The increase of resistivity and a decrease of electron mobility values observed for higher Aldopant concentrations (Fig. 1a) may be related with metal segregation toward grain boundary, increasing the energy barrier height between the grains, as discussed previously in the literature [16]. Thus, the increase of Al-dopant concentration may favor the metal segregation and aluminum oxide formation.…”

Dielectric properties of manganese-doped TiO2 with different alkali-free glass contents for energy storage application

“…5, the energy loss was represented by the area enclosed in the charge and discharge curve [18]. Divalent manganese ions would form electron traps to capture the electrons left by oxygen vacancies, and reduce the dielectric loss.…”

“…Unlike ferroelectric material such as BST, it had a higher energy efficiency on energy charge-discharge [10,17]. However, due to processing conditions, a small amount of oxygen vacancies as donor impurities often existed in titanium dioxide, which could increase dielectric loss and reduce breakdown strength [18][19][20][21][22]. Therefore, in this study, we chose acceptor (manganous)-doped titanium dioxide as the dielectric ceramic, the effect of different additive amounts of alkali-free glass on the dielectric properties of Mn-doped TiO 2 was investigated for its energy storage applications.…”