Owing to high lithium-ion conductivity and good stability with lithium metal, Li₇La₃Zr₂O₁₂ (LLZO – a solid electrolyte) has emerged as a viable candidate for solid-state battery applications. In the current study, Al substituted LLZO (Al-LLZO) powder is synthesized using a typical solid-state reaction. The pellets are made with the synthesized powder and are subjected to annealing for different durations and its effect on the structural properties of the Al-LLZO is investigated in detail. Reitveld refinement of powder X-ray diffraction pattern reveals that the sintered Al-LLZO belong to cubic system with Ia -3d space group at room temperature. Morphology and microstructural properties of sintered powder is analyzed using FESEM and HRTEM/SAED, respectively. FESEM image of LLZO pellets shows well-structured cubic grains spread evenly over on the surface after sintering. The chemical compositions of the sample are identified using EDAX. The surface chemistry of the prepared samples is examined by X-ray photoelectron spectroscopy (XPS), which states that the observed photoelectron signals from O1s at about 531 eV and Li1s at 54.52 eV corresponds to Li-O bond in Al-LLZO. Raman spectra have been analyzed and the observed Raman peaks appeared at 299 cm^-1, 393 cm^-1, 492 cm^-1, 514 cm^-1 were assigned to E_g, F_2g, A_1g and F_2g respectively. Phase transformation from C-LLZO to pyrochore LZO phase is noticed when the sample is sintered for 12 hr at 1100 °C. The impedance analysis is carried out to measure the conductivity of the Al-LLZO pellet and is found to be 0.3 X 10^-5 S/cm, which is suitable for solid electrolyte applications in LIBs.

In new research growth long after glow material is a potential candidate due to its physical properties, chemical stability and wide application in modern solid-state lightning (LED), display devices, dosimetry and sensors. A cerium doped strontium aluminate phosphor (SrAl₂O₄:Ce³⁺) was synthesized by conventional solid-state reaction method. The crystal structure and morphology of phosphors, while doping rare earth metal and lithium metal ion was investigated by using X-ray diffraction, Raman spectroscopy and field emission scanning electron microscopy. Fourier transformed infrared spectrum results of the synthesized phosphor composition conforms the characteristic vibration bands of synthesized phosphor. Surface composition analysis of the prepared samples was examined using X-ray photoelectron spectroscopy. Photoluminescence emission band observed at ∼420 nm, ∼490 nm and ∼610 nm region under the excitation wavelength of 256 nm. Wight light emission was confirmed using the Commission Internationale de L'Eclairage (CIE) chromatic coordinate graph. The correlated colour temperature (CCT) value of 0.5% Ce³⁺ doped SAO of phosphors was calculated is in the range of 1543 K, which is indicated the synthesized phosphors performance as warm white light source. The obtained phosphor has a high dielectric constant and low loss tangent which is useful to optoelectronic devices.