The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

Abstract

Two samples of the ferromagnetic alloyferroelectric ceramics nanocomposite (FeCoZr) x (PbZrTiO 3 ) (100−x) of similar metallic phase contents have been produced using ion-beam sputtering in the atmosphere of argon and oxygen. The samples have been produced in order to examine the influence of sputtering atmosphere parameters on electrical properties of the tested materials.In a nanocomposite of a reduced oxygen content, a conductivity increase by about three orders occurs along with the increasing frequency, which is associated with the occurrence of hopping recharging. Over the whole area of low measuring frequencies, negative values of the phase shift and a capacitive type of conductivity occur. For the frequency of about 10 6 Hz, the phase shift reaches zero, which corresponds to the voltage resonance phenomenon. For higher frequencies, positive phase shift values and inductive conductivity occur. For a sample of a higher oxygen content, phenomena of voltage resonance (low frequency values) and current resonance (high frequency values) can be observed. When the oxygen content increases, frequency dependences of the phase difference get shifted into the low frequency area. This is associated with the surface oxidation or a complete oxidation of the metallic-phase nanograins, which increases the potential barrier as well as with an increase of the relaxation time activation energy. For the sample of a higher oxygen content, an increase of the conductivity activation energy has been observed in the low temperature area.

Equivalent circuits of FeCoZr-alloy nanoparticles deposited into Al2O3 and PZT dielectric matrices nanogranular composite films

“…As was shown earlier [8][9][10], the ESCs of composite films under study contain resonant RCL-circuit for certain types of film morphologies. However, these works did not establish a clear relationship between the type of ESC and the morphological features of the films, which determine the manifestation of the negative capacitance effect in the samples.…”

Structure, Morphology and Electrical/Magnetic Properties of Ni-Mg Nano-Ferrites from a New Perspective

“…The P e is increased by increasing the temperature at which the hopping electrons are thermally activated, which requires a quick increase in the dielectric constant. The intriguing dielectric properties of oxide composites have recently been reported and analyzed [ 52 , 53 , 54 ].…”

Multilayered vacuum-arc nanocomposite TiN/ZrN coatings before and after annealing: Structure, properties, first-principles calculations

“…A varying the deposition conditions, such as gas pressure in the deposition chamber, bias potential, bilayer thickness, etc. allows to fabricate coatings with very high hardness [9][10][11], good wear coefficient and resistance to wear, oxidation [12][13][14][15][16][17] and to corrosion [18,19] as well as with good electrical properties [20,21]. As it was reported in the previous papers [22,23], coatings on the (Ti,Zr)N base have high hardness 42-48 GPa, as well as resistance to oxidation under the influence of high temperatures 1170°С [24][25][26][27][28].…”