Effect of concentration on lattice strain, dielectric properties and activation energy of CoFe2O4/BaTiO3 nanocomposites

p-/n-Type Switching in the Ag/BTO/TiO2 Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia

“…The dielectric constant was recorded as ∼37.4 at 6 kHz, which decreases until ∼33.2 at high frequency. 41,42 Panels c and d of Figure 8 represent a general decrease in dielectric properties upon increasing temperature, as also reported by Fu et al 2 The presence of three distinct dielectric constant (ε) peaks at 100, 175, and 350 °C reaches ∼46.6, ∼47.8, and ∼46.9 at 0.2 MHz, while at 50, 175, and 350 °C, it reaches ∼41.5, ∼41.8, and ∼ 34.2, respectively, at 1.5 MHz, which can be speculated as a distinct transition temperature for two different frequencies upon which the increase in dielectric polarization is evident as a result of interfaces and grain boundaries. The hump at 350 °C was speculated to be caused by the phase change of BaTiO 3 from orthorhombic to rhombohedral and degradation of small amounts of BaTiO 3 in BaTi 5 O 11 , as also depicted in the XRD pattern.…”

Dielectric study of CoFe2O4/MWCNT/epoxy nanocomposites: Effect of temperature, concentration and irradiation

“…Subsequently, the effect of ion beam irradiation of 120 MeV Au + by doses of 6 Â 10 12 ions/cm 2 To synthesize CoFe 2 O 4 (CFO) nanoparticles, chemical co-precipitation method is found to be appropriate due to ease of processing and low cost. [32] At first, hexa-hydrated cobaltous chloride and ferric chloride are dissolved in 100 mL distilled water, separately in molar ratio of 1:2, and stirred continuously for 20 min by magnetic stirrer. Then both the solutions are mixed together with continuous stirring to form a complex solution.…”