Dielectric Constant of Powders

NiFe2O4/Poly(1,6-heptadiyne) Nanocomposite Energy-Storage Device for Electrical and Electronic Applications

“…10 –1 –10 –9 s. , Figure shows the low permittivity of NiFe 2 O 4 /poly­(1,6-heptadiynes) nanocomposite compared to NiFe 2 O 4 alone, which is probably due to the conducting properties of the conjugated poly­(1,6-heptadiynes). , The permanent dipoles existing in a poly­(1,6-heptadiynes) polymer are unable to follow over the applied frequency range, which is probably due to the polymer in the vicinity of nickel ferrite nanoparticles restricting the molecule-induced dipole angular momentum; consequently, charge transport is high throughout the polymer (between nickel ferrite particles, where the polymer can act as a medium for charge transport) and hence the non-resonant (frequency-independent) permittivity characteristics over the frequency range (10 2 –10 5 Hz) was observed. Further, the non-resonant permittivity-influenced polymer conducting properties can be elucidated via diffusing coefficient of the polymer, if the self-diffusing coefficient of the polymer is low, which results in high conductivity of the polymer due to more number of nonbond interactions induced by the hoping charge carrier mechanism. − This, in turn, depends on molecule density in accordance with the Clausius–Mossotti relation and intermolecular forces. , Moreover, in NiFe 2 O 4 /poly­(1,6-heptadiynes) nanocomposite, the polymer molecule behaves qualitatively like a polar substance, which connects the two nickel ferrite nanoparticles and consequently has higher charge-transport capability. Also, this can help in the reduction of τ = RC time constant by reducing “ R ” of the composite medium .…”

“…The electric field-induced net polarization “ P ” contributes electronic, atomic, and dipolar polarization mechanisms and consequently intrinsic dielectric permittivity. Further, these features can be explained efficiently with the aid of Clausius–Mossotti relation, as shown in eq 1(42,43)where P e is the electronic polarization, P a is the atomic polarization, P d is the dipolar polarization, K is the total dielectric constant, which is expressed as K = (ε – 1)/(ε + 2), M is the molecular weight, ε is the dielectric constant, and d is the density. The net K is an analytical interpretation that reveals the dielectric permittivity of a mixture of two materials, which is further in proportion to the masses.…”

“…The net K is an analytical interpretation that reveals the dielectric permittivity of a mixture of two materials, which is further in proportion to the masses. The same can be analyzed with the aid of the Clausius–Mossotti relation and is shown in eq 2(42,43)In dielectric composite materials, the external field-induced dielectric polarization arises from the finite displacement of dipoles and their rotations. 44 In the atomic scale, distribution of electron cloud distortion is pre-eminent for the dipole-induced polarization.…”

“…54−56 This, in turn, depends on molecule density in accordance with the Clausius–Mossotti relation and intermolecular forces. 42,43 Moreover, in NiFe 2 O 4 /poly(1,6-heptadiynes) nanocomposite, the polymer molecule behaves qualitatively like a polar substance, which connects the two nickel ferrite nanoparticles and consequently has higher charge-transport capability. Also, this can help in the reduction of τ = RC time constant by reducing “ R ” of the composite medium.…”

“…The electric field-induced net polarization "P" contributes electronic, atomic, and dipolar polarization mechanisms and consequently intrinsic dielectric permittivity. Further, these features can be explained efficiently with the aid of Clausius− Mossotti relation, as shown in eq 1 42,43 = = + + KM d P P P P e a d…”