Structural,optical and dielectric investigations on RECr_(0.85)Mn_(0.15)O_(3)(RE=Ho,Gd and Pr) nanoparticles  

作　　者：Komal Kanwar Sonali Pradhan S.Satapathy Yugandhar Bitla Neeraj Panwar 

机构地区：[1]Department of Physics,Central University of Rajasthan BandarsindrAjmer,305817,Rajasthan,India [2]Laser Material Section,HBNI,Raja Ramanna Centre for Advanced Technology,Indore,452013,India

出　　处：《Journal of Rare Earths》2024年第2期399-408,I0006,共11页稀土学报（英文版）

基　　金：Project supported by the Science and Engineering Research Board(SERB)New Delhi,India(ECR/2017/002681);Inter University Accelerator Centre,New Delhi,India(UFR-62317)。

摘　　要：We hereby report the room-temperature structural and optical characterization of RECr_(0.85)Mn_(0.15)O_(3)(RECMO,RE=Ho,Gd and Pr) compounds synthesized by the auto-combustion sol-gel route.Their low temperature dielectric properties are also presented.The RECMO compounds crystallize in an orthorhombic Pbnm symmetry with an average grain size range of 51-80 nm.Structural analysis reveals an increase in the structural distortion compared to that of the undoped bulk compounds.Optical measurements exhibit a significant reduction in bandgap values for RECMO nanoparticles when compared with their undoped bulk compounds.Further,from the absorbance measurements various optical parameters such as skin depth,extinction coefficient,refractive index and optical conductivity were also calculated.The dielectric analysis confirms the lower values of the dielectric permittivity and dielectric loss than those of their corresponding bulk compounds.AC conductivity versus frequency and temperature data are fitted according to the Jonscher's power law and Arrhenius law,respectively.The small polaron hopping is responsible for the electric conduction in these compounds.The tunability of the optical and dielectric properties as a result of substitution and particle size reduction makes these materials useful for various potential applications in photocatalysis,optoelectronics and low permittivity dielectrics.

关 键 词：Rare-earth orthochromites NANOPARTICLES Optical properties Dispersion parameters Dielectric properties Small polaron hopping 

分 类 号：TB383.1[一般工业技术—材料科学与工程]