Impedance spectroscopy and DFT/TD-DFT studies of diyttrium trioxide for optoelectronic fields  

作　　者：Ali A.Alkathiri A.A.Atta Moamen S.Refat Sonam Shakya A.M.Hassanien Saud A.Algarni Emad M.A.Ahmed Sultan E.Alomariy Mohammed Alsawat Norah Algethami 

机构地区：[1]Department of Physics,College of Science,Taif University,P.O.Box 11099,Taif,21944,Saudi Arabia [2]Department of Chemistry,College of Science,Taif University,P.O.Box 11099,Taif,21944,Saudi Arabia [3]Department of Chemistry,Aligarh Muslim University,Aligarh,202002,India [4]Department of Physics,Faculty of Science and Humanity Studies at Al-Quwayiyah,Shaqra University,Al-Quwayiyah,11971,Saudi Arabia

出　　处：《Journal of Rare Earths》2023年第4期605-612,共8页稀土学报（英文版）

基　　金：supported by Taif University Researchers,Taif University,Taif,Saudi Arabia(grant numbers TURSP-2020/22)。

摘　　要：Yttrium(Ⅲ)oxide or so-called diyttrium trioxide(Y_2O_3)is an excellent candidate ceramic material for optoelectronic applications.Structural,electrical conductivity,and dielectric relaxation properties of bulk yttrium(Ⅲ)oxide were studied.X-ray diffraction(XRD)results indicate that the yttrium(Ⅲ)oxide compound has a crystalline cubic phase.Fourier transform infrared(FTIR)technique was used to ascertain the chemical structure of the yttrium(Ⅲ)oxide compound.Impedance spectroscopy was used to analyze frequency-dependent electrical properties as a function of temperature in the range of 303-423 K and frequency range of 0.1 Hz-2 MHz.Impedance spectroscopy parameters such as dielectric constant,dielectric loss,loss factor,electric modulus,and complex impedance of the yttrium(Ⅲ)oxide compound were studied.The Nyquist plot describes the complex impedance of the yttrium(Ⅲ)oxide for different temperatures.The universal Jonscher's power law was used for the analysis of the complex electrical conductivity of the yttrium(Ⅲ)oxide compound.It is found that the real(σ')and imaginary(σ")parts of the complex conductivity increase with increasing frequency.The exponent frequency(s)equals unity,which confirms that the predominant conduction mechanism is a nearly constant loss(NCL)mechanism.DFT/TD-DFT studies using B3LYP/LanL2DZ level of theory were used to provide comparable theoretical data and electronic energy gap of HOMO→LUMO.

关 键 词：Yttrium(Ⅲ)oxidel Impedance spectroscopy DFT/TD-DFT Rare earths 

分 类 号：TQ174.1[化学工程—陶瓷工业] O641.1[化学工程—硅酸盐工业]