Structural, spectral and dielectric properties of piezoelectric–piezomagnetic composites

DC conductivity and magnetic properties of piezoelectric–piezomagnetic composite system

“…Both quantities K 1 and M s vary with temperature. The grain size of the NZF piezomagnetic phase was found to decrease with increasing BT content as given from the SEM [16], hence leading to the decrease of m i . Fig.…”

Structural phase transformations of as-synthesized Cu-nanoferrites by annealing process

“…This may be due to the variation of the random distribution of diamagnetic Cu +2 ions at the A-and B-sites as nearest neighbors of Fe 3+ ions amongst Aand B-sites with T [8,19,30]. 13 [25,32,33]. The distribution of Fe 3+ ions amongst the A-and B-sites can be explained from drawing the relation between the area ratio of B-to A-sites (B/A) against T as evidenced in Fig.…”

“…It is illustrated that the lattice constant a decreases slowly with T and splits at 900 o C to a and c. This decrease and split of a results from the tetragonal distortion of JTE which makes the crystal lattice elongates in the direction of c and shrinks in the direction of a[18,[23][24][25]. It may be due to moving the cations between the A-and B-sites by annealing the samples at higher temperatures, where the Cu 2+ ion (0.073 nm) is larger than Fe 3+ ion (0.067 nm)[23,24].…”

Dielectric property of unidirectional triangle-shape carbon fiber reinforced polymeric composites

“…When an external electric field is applied to the dielectric materials, the electric charges are accumulated within the dielectric material and some energy loss takes place due to the frictional damping of the electric dipoles. 3,5,11,13 Therefore, the dielectric materials within an external electric field are generally modeled by the electric circuit being composed of capacitance C filled with resistance R, as shown in Figure 4. In this equivalent circuit model, the capacitance and the resistance are corresponding to the real part (" 0 r ) and the imaginary part (" 00 r ) of the complex relative permittivity, respectively.…”

“…3,4 Since the mechanical properties and dielectric properties of carbon fiber reinforced polymeric composites (CFRP) can be tailored effectively, they are plausible materials for fabricating the RAS of desired performance. 3,5,6 Usually, the carbon fibers with noncircular-shapes are used in the RAS to enhance the absorbing property of the carbon fiber reinforced polymeric composites. In order to develop EM absorbers with noncircular-shape carbon fiber reinforced polymeric composites, of which the dielectric properties should be available and could be regulated easily in the target frequency bands.…”