Structural, optical and dielectric properties of tellurium-based double perovskite Sr2Ni1−xZnxTeO6. Issue 50 (27th September 2021)

• Record Type: Journal Article
• Authors: Alias, Fatasya Izreen Hanim; Rajmi, Rozilah; Maulud, Mohd Fauzi; Mohamed, Zakiah
• Is Part Of: RSC advances. Volume 11:Issue 50(2021)
• Page Start: 31631
• Page End: 31640
• Publication Date: 2021-09-27
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra03662a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : In this paper, Sr2 Ni1− x Zn x TeO6 ( x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) double perovskite compounds were synthesised by the conventional solid-state method, and the structural, optical and dielectric properties were investigated. Abstract : In this paper, Sr2 Ni1− x Zn x TeO6 ( x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) double perovskite compounds were synthesised by the conventional solid-state method, and the structural, optical and dielectric properties were investigated. The Rietveld refinement of X-ray diffraction data shows that all compounds were crystallised in monoclinic symmetry with the I 2/ m space group. Morphological scanning electron microscopy reported that the grain sizes decreased as the dopant increased. The UV-vis diffuse reflectance spectroscopy conducted for all samples found that the optical band gap energy, E g, increased from 3.71 eV to 4.14 eV. The dielectric permittivity ε ′ values increased for the highest Zn-doped composition, Sr2 Ni0.2 Zn0.8 TeO6, being ∼1000 and ∼60 in the low- and high-frequency range, respectively. All samples exhibited low dielectric loss (tan δ ≤ 0.20) in the range of 10 4 –10 5 Hz frequency. Impedance measurement revealed that grain resistance decreased with enhancement in Zn content in the Sr2 NiTeO6 crystal lattice.