Influence of polarization and iron content on the transport properties of praseodymium–barium manganite

Effect of Sintering Temperature and Polarization on the Dielectric and Electrical Properties of La0.9Sr0.1MnO3 Manganite in Alternating Current

“…Then, ‘s 1 ’ continuously decreases with the risein the temperature. Such a variation confirms the contribution of the correlated-barrier-hopping (CBH) mechanism in conduction [ 38 , 39 , 40 , 41 ]. However, this model (CBH) is marked, equally, from the variation in the exponent ‘s 2 ’ with the temperature, which decreases in the entire temperature range ( Figure 2 d–f).…”

“…In Figure 2 a,b, the ‘s 1 ’ increases with the temperature increase in the first region of temperature. This proves that non-overlapping small polaron tunneling (NSPT) [ 38 , 39 , 40 , 41 ] is the most suitable model to characterize the conduction for T S = 800 and 1000 °C. This increase in ‘s 1 ’ with the rise in the temperature is in good agreement with the theory that is described by the following expression [ 38 , 39 , 40 , 41 ]: s = 1 + (4k B T/W H ) where W H is the polaronhopping energy and k B is the Boltzmann constant.…”

Correlating melting and collapse of charge ordering with magnetic transitions in La 0.5-x Pr x Ca 0.5 MnO 3

“…At A site, doping of divalent at trivalent cations results in an inhomogeneous distribution of Mn 3+ and Mn 4+ ; this amendment can alter Mn 3 + -O-Mn 4+ network linkages which can change both of the magnetic and electrical properties [22]. In the present work, Mn 3+ /Mn 4+ ratio is assumed to be fixed and the change of A site cation is conferred to bring changes only in the bond angle of Mn 3+ -O-Mn 4+ along with alteration in the Mn-O bond length [23].…”

Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19

“…6 shows the variation of ln( σ dc T ) against the inverse of the temperature for all samples. At high temperatures, the experimental data of the dc conductivity are well adjusted by the law of Mott and Davis which describes the small polaron hopping (SPH): 63 where, E a is the activation energy, T is the absolute temperature, k B is the Boltzmann constant and σ 0 is a pre-exponential factor.…”