Understanding the structural, optical, and dielectric characteristics of SrLaLiTe1−xMnxO6 perovskites

Abstract

In electronic applications, good dielectric permittivity material has huge potential in the capacitive energy storage devices. Herein, in the present work the dielectric study of SrLaLiTe1−xMnxO6 (x = 0.02, 0.04, 0.06, 0.08, and 0.10) double perovskites has been studied and discussed. These compounds were prepared through solid-state reaction method. All of the prepared compounds were confirmed to crystallized in monoclinic structure of P21/n space symmetry with better crystallization when dopant concentrations increased until x = 0.08. The formation of Li–O–Te/Mn bonds in octahedral structures in all compounds were confirmed in this study. The existence of peaks at specific wavenumbers indicated vibrations of B–site cations’ bonds. When dopant amounts were increased from x = 0.02 to x = 0.08, there was an increasing trend of grains sizes formation in the compounds. The discussions on effects of grain sizes towards dielectric properties were included in this paper. Other important results and discussions comprised of the significant effects of dopant on the optical band gap (Eopt) and absorption frequencies of the compounds. The decreasing trend of Eopt towards semiconductor range indicated the compounds’ promising potentials for optoelectronic device application.

Structural, optical and dielectric properties of tellurium-based double perovskite Sr2Ni1−xZnxTeO6

“…A strong absorption band at 300 nm to 450 nm may be related to the charge transfer transition between doped Zn 2+ and O 2− (valence and conduction band) in the lattice structure. 18,24 As Zn 2+ increases, the increase of reflectance value of compound shows the reduction of absorbance properties. The absorption coefficient is calculated from diffuse reflectance spectra using Kubelka–Munk (KM) function, as shown in eqn (3) : 12 where f ( R ) represents the KM function, α is the absorption coefficient, s is the scattering coefficient and R is the reflection coefficient.…”

“…The highest density of Sr 2 Ni 0.2 Zn 0.8 TeO 6 could explain its higher dielectric value at both regions compared with other compounds. 18 …”

Effect of alkali metals on physical and spectroscopic properties of cellulose

“…This blue shift reflects the interaction between the metal's atom and the OH group of the CH 2 OH moiety of celluose, resulting in the exhaustion of hydroxyl groups and consequent reduction in the intramolecular and intermolecular hydrogen bonds 68 , 69 . Regarding cellulose-Li structures, the Li–O bond stretching vibrations were found at 470–450 cm −1 70 – 73 and the intensity of such vibrations was found to increase with increasing the number of lithium atoms interacting with cellulose. The specific vibration of Na–O bond was found at 440–430 cm −1 in cellulose-Na structures 74 .…”

Effect of Mn Doping on the Optical and Electrical Properties of Double Perovskite Sr2TiCoO6

“…The conductivity of the grain boundary is more active at lower frequencies, as the grain effect becomes dominant at high frequencies. This phenomenon is also attributed to the space charge polarization that primarily consists of the accumulated heavy electrical dipoles at grain/grain boundary interfaces when electrical field alternation occurs [ 49 , 50 ]. The dielectric constant value remains unchanged because the electron/hole exchange will not occur at high frequency [ 48 , 51 , 52 ].…”