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

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.

Preparation, Structural Analysis, and Tunability of Optical and Dielectric Characteristics of Mn–modified SrLaLiTeO6 Double Perovskite

SrLaLiTe 1- x Mn x O 6 ( x = 0.02, 0.04, 0.06, 0.08, 0.10) double perovskites have been prepared using solid state method. Studies on structural by applying X–ray diffraction (XRD) characterization found that all compounds formed in monoclinic, P2 1 /n symmetry with reduction of lattice parameters and unit cell volume as dopant concentration increased. The formation of Te 6+ /Mn 6+ –O–Li + octahedral structure can be confirmed with the presence of peaks at certain wavenumbers indicating vibrations of Te – O or Mn – O bonds. As dopant concentration increased, field emission scanning electron microscope (FESEM) characterization found that the increasing trend of formation in grains sizes from x = 0.02 to x = 0.08, and its effects towards dielectric properties which were conducted by electrochemical impedance spectroscopy (EIS) studies were discussed in this paper. Other discussions included were regarding the significant effect of dopant towards optical band gap, E opt and absorption frequencies of prepared compounds compared to pristine compound indicating its promising potential for optoelectronic device application.