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.
Relatively new double perovskite material, Sr2CaTeO6, has been prepared through conventional solid-state procedures. Structural, dielectric, and optical characteristics of this exquisite solid-state material were analysed in this study. The single-phase monoclinic P21/n structure of this prepared compound was well correlated with the literature review. Good distribution of grain sizes and shapes was observed in the morphological study of this compound. The discussions on its optical and dielectric properties are included in this manuscript. High dielectric real permittivity, low dielectric loss, and good capacitance over a range of temperatures possessed by this compound, as shown in dielectric and electrical modulus studies, indicated good potential values for capacitor applications. The Ro(RgQg)(RgbQgb) circuit fitted well with the impedance and electrical modulus plot of the compound. Its relatively high electrical DC conductivity in grain at high frequencies and its increasing value with the temperature are typical of a semiconductor behaviour. This behaviour might be attributed to the presence of minor oxygen vacancies within its lattice structure and provides a long-range conduction mechanism. A small difference between activation energy and Ea of DC conductivity indicates that the same charge carriers were involved in both grains and the grain boundaries’ long-range conduction. The electrical AC conductivity of this compound was found to contribute to the dielectric loss in grain structure and can be related to Jonscher’s power law. The presence of polarons in this compound was exhibited by non-overlapping small polaron tunnelling (NSPT) and overlapping large polaron tunnelling (OLPT) conduction mechanisms over a range of temperatures. Wide optical band gap and Eopt in the range of 2.6 eV to 3.6 eV were determined by using an indirect and direct allowed mechanism of electrons transitions. These values supported the efficient semiconducting behaviour of the grain in this material and are suitable for applications in the semiconductor industry.
In this study, the fabrication of in-situ anodic alumina template (AAO) directly onto glass substrate is realized by varying the stirring speeds and molarity of phosphoric acid. Porous alumina template will then be used to infiltrate vanadyl 2, 9, 16, 23-tetraphenoxy-29H, 31H-phthalocyanine (VOPcPhO) prior to the formation of alumina:VOPcPhO nanocomposite. VOPcPhO has seen to fully infiltrate the template with the excess formation of VOPcPhO layer on top of the porous due to the lengthy immersion time of 6 hours. Uniformity and density of pore size, and available pore, can be respectively tuned by varying the stirring speeds (0 -300 rpm) and molarity of pore widening agent (0 -10 % of phosphoric acid). Roundedsphere shape of pores has been observed with higher transparency template is dominated by stirring the speed between 100 and 200 rpm. At these speeds, the template's pore size and pore density are highly homogeneous. Different molarity of phosphoric acid as a pore widening agent has an effect on the pore size and pore density. Occurrence of merging pores is observed by increasing the molarity of agent to 10% which unlikely to happen in the lower molarity of 5% phosphoric acid. Optical properties of alumina:VOPcPhO nanocomposites that identified from the characterization of UV-vis, photoluminescence (PL) and Raman spectroscopies, support the successful infiltration of VOPcPhO. Alumina:VOPcPhO nanocomposite has ability to absorb light at the longer wavelength and photon can be emitted by the nanocomposite at the respective energies.
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