Nanograins dependent dielectric constant, tunability, phase transition, impedance spectroscopy and leakage current of (Pb1−xSrx)TiO3 thin films

Structure and magnetic properties of Ti1−xCoxO2 nanoparticles prepared by chemical route

“…It is also clear from Fig. 5 that the dielectric constant increases with increasing Co concentration because of increasing particle size [25]. The high dielectric constant measured at low frequency region might be attributed to the Maxwell-Wagner type interfacial polarization mechanism.…”

“…Furthermore, the peak position shifts to smaller angle with increasing of Co content, revealing of changes in lattice parameters. The values of lattice parameters for rutile phase of, a(Å)¼4.595, 4.596 and 4.603 and c(Å)¼2.969, 2.968 and 2.970 and the average particle's size of (using Debye-Scherer's relation) 25, 27 and 28 nm, respectively, are calculated from XRD data for TC1, TC2 and TC4 nanoparticles. The values of a, c and average particle's size are given in Table 1.…”

Impedance spectroscopy and dielectric properties of Ce and La substituted Pb0.7Sr0.3(Fe0.012Ti0.988)O3 nanoparticles

“…At higher frequencies the losses are found to be low, since domain wall motion is inhibited and magnetization is forced to change rotation. After 15 MHz the abrupt variation in ε and tan ı may occur due to resonance effect [9]. Fig.…”

“…In addition to the coexistence of ferroelectricity and ferromagnetism, the magnetoelectric (ME) coupling (i.e., magnetic degree of freedom can be manipulated by an electric field and vice versa) for spintronic devices [1][2][3][4][5][6], and the occurrence of good dielectric properties for various applications (i.e., tunable mixers, phase shifters, voltage controlled oscillators, delay lines and ultra large-scale integration dynamic random access memory (DRAM) capacitors) of MF are highly important [7,8]. The dielectric properties of nanostructured MF and ferroelectrics are suitable for those devices which operate at higher frequencies [7,9]. The dielectric properties are dependent on several factors, such as method of preparation, heat treatment, sintering conditions, chemical composition, cation distribution and crystallite size.…”

Studies of structural and electrical characteristics of multi-substituted Bi0.5Na0.5TiO3 ferroelectric ceramics

“…Where Js is the current density across the Schottky type barrier, A is a constant known as Richardson constant, kB is the Boltzmann constant, T is the absolute temperature, φb is the height of Schottky barrier (voltage across the barrier) and E is the electric field [83][84][85]. The above relations specify that log Js varies directly with E 1/2 .…”