Two‐Phase Ceramic Dielectrics

MgO Effect on The Dielectric Properties of BaTiO3

“…The two phases, are promising for the development of high electric permittivity and high dielectric strength capacitors, therefore, the breakdown voltage is expected to be high, since the paraelectric (MgO) phase is continuous at this concentration [25]. Our results confirm the findings in [25] since TiO 2 and TiO phases have vanished in BTM50. Sample BTM50 is a two phase material which is promising to have excellent thermal shock resistance, mechanical strength, and chemical resistance preperties.…”

“…Its curve is characterized by small maxima at 120°C and 200°C and ends by an increase towards 1000 at 400°C. The ε r of the sample BTM50 is close to the value found in [25] where BaTiO 3 and MgO were both in the ratios 50% in volume. The ε r , of the two phase material depends not only on the electric permittivity of the two phases (MgO and BTiO 3 ), but it is highly affected by the structure (phase distribution and grain size) and the stress level between the phases as a result of the differences in their thermal expansion result [25].…”

“…The ε r , of the two phase material depends not only on the electric permittivity of the two phases (MgO and BTiO 3 ), but it is highly affected by the structure (phase distribution and grain size) and the stress level between the phases as a result of the differences in their thermal expansion result [25]. The two phases, are promising for the development of high electric permittivity and high dielectric strength capacitors, therefore, the breakdown voltage is expected to be high, since the paraelectric (MgO) phase is continuous at this concentration [25]. Our results confirm the findings in [25] since TiO 2 and TiO phases have vanished in BTM50.…”

“…They can be excellent in thermal shock resistance, in mechanical strength, and in chemical resistance. Concerning MgO-doped BaTiO 3 composite, only a few studies have been made [25]. In this paper, 5mol.%, 10mol.%, 15mol.%, 20mol.%, 30mol.%, and 50mol.% MgO-doped BaTiO 3 have been studied.…”

High Temperature Coatings for Oxidation and Erosion Protection of Heat-Resistant Carbonaceous Materials in High-Speed Flows

“…5. The method of coating with pastes and slurries (slip-roasting) allows to apply coatings [31,33,[108][109][110][111][112] on parts of complex shape and has a low cost, but this technology requires a relatively high temperature heat treatment to obtain dense coatings, which, in turn, can cause damage to CCM [113]. In recent years, the production of protective coatings is increasingly achieved by combining several traditional technologies.…”