The two main challenges for an effective perovskite catalyst are structural instability and a low dielectric constant. To overcome these difficulties, zinc-doped strontium manganate (SrMnO 3 ) perovskite ceramics with the formula SrMn 1-x Zn x O 3 (with x = 0.1, 0.2, 0.3, and 0.4) nanomaterials were synthesized via the sol-gel combustion method. In the current research, the effect of Zn doping on the structural, optical, and dielectric properties was studied by performing X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), UV–vis spectroscopy, and impedance spectroscopy. The XRD analysis confirmed that all the synthesized samples exhibit a single-phase orthorhombic structure with a Pmmm space group. An increase in crystalline size was observed with increasing Zn²⁺ doping. The FTIR spectra supported the structural findings of the XRD results. The optical band gap energies, determined from Tauc plots based on UV–vis absorption data, were approximately 1.98 eV, 1.88 eV, 2.09 eV, and 2.08 eV for x = 0.1, 0.2, 0.3, and 0.4, respectively. The band gap initially decreased with Zn doping and then increased with further Zn 2 + incorporation. Frequency-dependent dielectric measurements revealed that both the dielectric constant and dielectric loss decreased with increasing frequency and doping concentration. The results demonstrate that strategic Zn doping is a highly effective strategy for enhancing the functional properties of strontium manganate perovskites.
Hasan et al. (Thu,) studied this question.