Ni²⁺doping effect on potassium barium titanate nanoparticles: enhancement optical and dielectric properties

Abstract

Nano-structure ferromagnetic-ferroelectric composite materials produced by the sol gel method have great attention in different applications due to their desired properties and applications. Potassium Barium titanate doped with different concentrations of Ni 2+ nanoparticles (K 0.1 Ba 0.9 Ti (1−x) Ni x O 3 ; x=0.0-0.3) were prepared by sol-gel process. The final nanoparticles were obtained through drying and calcination at 200 °C and 600 °C, respectively. The crystalline, nanoparticles' nature and the optical characteristics of the Ni-KBTO nanoparticles are investigated using XRD, SEM, TEM, and optical properties. The XRD and TEM results demonstrate that the Ni 2+ NPs were superlatively incorporated within the semi-crystalline KBTO structure. TGA thermogram of all samples shows two weight loss events. The first event is assigned for impurities and/or adsorbed water releasing. The second event was at a higher temperature and assigned as degradation of the nanoparticles. The thermal stability was enhanced by Ni 2+ incorporation. The KBTO nanoparticles exhibit enhancement optical bandgap, which decreases from 3 eV to 2.3 eV with increasing Ni 2+ in KBTO NPs. This can be ascribed to the change in nanoparticles arrangement and resembles band structures between Ti 4+ and Ni 2+ , resulting in the efficient transfer of charge carriers. The dielectric constant was in the range 10 6 to 10 7 at low frequency and about 10 1 to 10 2 at high frequency. The Curie temperature of pure Potassium barium titanate is 373 K and 328 K for Potassium barium titanate doped with 20% of Ni 2+ .

Sol-Gel/Gel Casting Nanoarchitectonics of Hybrid Fe2O3–ZnO/PS-PEG Nanocomposites and Their Optomagnetic Properties

“…7d for the prepared samples along with the next Eqs. [26,42]: where α, n, and c, respectively are the absorption coefficient, refractive index, and speed of light. The σ op nearly decreased as the wavelength increased.…”

Effect of Co‐Doping on the Structural and Dielectric Properties of La0.8K0.2MnO3 Perovskite

“…[6,7] In contrast, considerable attention has been employed to the Pechini sol-gel method for the preparation of perovskites, which innovate pure and homogenous nanoparticles to exhibit specified physical properties. [8][9][10][10][11][12][13][14][15][16] The general manganite formula LaMnO 3 exhibits an orthorhombic crystal structure with a predominant Jahn-Teller effect. It presents also an antiferromagnetic (AFM) interaction dominated by a superexchange coupling between Mn 3þ sites.…”

“…In fact, this variation was investigated by doping the A sites, by transition elements [5,18] and/or rare earth. [15,19] This behavior contributes to changes the type of the existing transition, which strongly affect the dielectric properties.…”

“…In contrast, considerable attention has been employed to the Pechini sol–gel method for the preparation of perovskites, which innovate pure and homogenous nanoparticles to exhibit specified physical properties. [ 8–10,10–16 ]…”

Adjusting the Effects of Cr3+ Doping on Structural, Dielectric, Antimicrobial Properties of Delafossite SrCuO2 Nanoparticle

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