Structural and Optical Properties of Perovskite_Type Compounds Obtained by Ultrasonic Method

7th International Conference on Advanced Materials and Structures

Sfirloaga, P.^1 ; Stoia, M.^2 ; Poienar, M.^1 ; Vlazan, P.^1

National Institute for Research and Development in Electrochemistry and Condensed Matter, Condensed Matter Department, P. Andronescu no.1, Timisoara

300254, Romania^1

Politehnica University of Timisoara, P-ta Victoriei no. 2, Timisoara

300006, Romania^2

关键词: Diffuse reflectance;    Fourier transform infra red (FTIR) spectroscopy;    Kubelka-Munk equation;    Reaction medium;    Semi-quantitative analysis;    Structural and optical properties;    Ultrasonic methods;    UV-vis spectroscopic measurement;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/416/1/012067/pdf
DOI  :  10.1088/1757-899X/416/1/012067

来源: IOP

【 摘 要 】

Perovskite-type NaTaO3 (NaT) and NaNbO3 (NaN) materials have been successfully obtained by ultrasonic method with immersed sonotrode in the reaction medium followed by annealing at 600oC, for 6 h. The influence of thermal treatment on phase composition, particle size, and morphology of the obtained materials have been investigated by X-ray diffraction (XRD), Diffuse reflectance ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), and semiquantitative elemental analysis - EDX. The average size of the crystallites of NaT materials was found to be 37.7 nm while that of NaN materials was found to be 30.5 nm. The optical band gap was determined using Kubelka-Munk equation from UV-Vis spectroscopic measurements and is estimated to be 4.05 eV for NaTaO3 and 3.87 eV for NaNbO3 perovskite-type samples. EDX semiquantitative analysis has highlighted the purity of the obtained materials, and quantification confirmed the stoichiometry of the compounds (ABO3).