Topic
Dielectric loss
About: Dielectric loss is a research topic. Over the lifetime, 20296 publications have been published within this topic receiving 349254 citations.
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TL;DR: In this article, the structural and electrical properties of nano particles of Al doped Ni 0.2 Cd 0.3 Fe 2.5 O 4 ferrite using X-ray diffraction, dielectric spectroscopy and impedance analysis were reported.
124 citations
TL;DR: In this paper, the effects of Sm3+ substitution on the dielectric loss and the mean mean square error (MSE) of Ca1-xSm2x/3TiO3 ceramics were investigated as a function of the amount of Sm 3+ substitution.
Abstract: Microwave dielectric properties of Ca1-xSm2x/3TiO3 ceramics were investigated as a function of the amount of Sm3+ substitution (0.0 ≤x≤ 0.8). The structure was changed from orthorhombic perovskite at x= 0.0 to tetragonal at x= 0.6. As the calcium vacancy concentration increased with increased Sm3+ substitution, the unloaded Q value (similar/congruent 1/tan delta) increased up to the solid-solution limit at x= 0.6 and then decreased because of formation of the secondary phase Sm2Ti2O7. The dielectric constant decreased with increased Sm3+ substitution. The effects of Sm3+ substitution on dielectric loss and dielectric constant of the specimens were analyzed by the infrared reflectivity spectra in the range 50–4000 cm−1, which were evaluated using the Kramers-Kronig analysis and classical oscillator model. The correlations among dielectric constant, dielectric loss, and dispersion parameters were studied.
124 citations
TL;DR: Experimental results show that the values of e′, e″ and tan δ are a strong function of the temperature, and results indicate the interfacial polarization can be more easily occurred at high temperatures.
124 citations
TL;DR: In this paper, a three-phase composite with multiwall carbon nanotube (MWNT) and BaTiO3 particles embedded into polyvinylidene fluoride (PVDF) was prepared.
Abstract: A three-phase composite with multiwall carbon nanotube (MWNT) and BaTiO3 particles embedded into polyvinylidene fluoride (PVDF) was prepared. The uniform dispersion of fillers was realized, and the dielectric constant was as high as 151 at 102Hz when the volume fraction of MWNT and BaTiO3 were 0.01 and 0.15, respectively. The BaTiO3-MWNT/PVDF composite with high dielectric constant displayed relatively low dielectric loss and good flexibility due to the low concentrations of MWNT and BaTiO3. The results can be explained by the space charge polarization at the interfaces between the conductor and the insulator and the evolutions of conductive pathway and microcapacitance structure.
124 citations
TL;DR: In this article, CH3NH3PbI3 perovskite thin films were applied to fluorine-doped SnO2 (FTO)/glass and Au/Ti/polyethylene terephthalate (PET) substrates via a two-step process, which involved depositing a CH 3NH3I (MAI) solution onto PbI2 films via spincoating followed by crystallization at temperatures of 100 °C.
Abstract: CH3NH3PbI3 (MAPbI3) perovskite thin films were applied to fluorine-doped SnO2 (FTO)/glass and Au/Ti/polyethylene terephthalate (PET) substrates via a two-step process, which involved depositing a CH3NH3I (MAI) solution onto PbI2 films via spin-coating followed by crystallization at temperatures of 100 °C. The 500 nm-thick crystallized MAPbI3 perovskite thin films showed a Curie temperature of ∼328 K, a dielectric permittivity of ∼52, a dielectric loss of ∼0.02 at 1 MHz, and a low leakage current density of ∼10−7 A cm−2 at ±3 V. The polarization–electric field (P–E) hysteresis loop and piezoresponse force microscopy (PFM) results showed that the films had well-developed ferroelectric properties and switchable polarization. Poling at an electrical field of 80 kV cm−1 enhanced the power density of the generator. The values for output voltage and current density of the poled films reached 2.7 V and 140 nA cm−2, respectively, which were 2.7-fold higher than those of the non-poled samples.
124 citations