Studies of structural, microstructural, optical and dielectric properties of  GdMnO<sub>3</sub>

Priyadarshinee, Supriya; Pati, Jayashree; Mahapatra, Ranjita; Mohanty, Pragyan; Mishra, D. K.; Mohapatra, Jyoshnarani; Priyadarshinee, Supriya; Pati, Jayashree; Mahapatra, Ranjita; Mohanty, Pragyan; Mishra, D. K.; Mohapatra, Jyoshnarani

doi:2023.60.1.203

J. Korean Ceram. Soc. > Volume 60(1); 2023 > Article

Original Article

Journal of the Korean Ceramic Society 2023;60(1): 203-214.
doi: https://doi.org/10.1007/s43207-022-00256-3

Studies of structural, microstructural, optical and dielectric properties of GdMnO₃

Supriya Priyadarshinee¹, Jayashree Pati¹, Ranjita Mahapatra¹

, Pragyan Mohanty¹, D. K. Mishra¹, Jyoshnarani Mohapatra²

¹Department of Physics, Faculty of Engineering and Technology (ITER), Siksha ‘O’ Anusandhan Deemed to be University, Khandagiri Square, Bhubaneswar 751030, Odisha, India
²Department of Physics, College of Basic Science and Humanities, Odisha University of Agriculture and Technology, Bhubaneswar 751003, Odisha, India

Correspondence

Ranjita Mahapatra ,Email: ranjitamahapatra@soa.ac.in

Received: March 10, 2022; Revised: August 24, 2022 Accepted: September 29, 2022. Published online: October 25, 2022.

ABSTRACT

GdMnO₃ has been synthesized by modified solid state reaction route followed by reaction sintering at 950 °C. Characterizations such as XRD, Raman, SEM, EDAX, FTIR, UV–Visible and dielectric have been carried out for the structural, microstructural, optical and dielectric studies. Orthorhombic structure with pbnm space group of GdMnO₃ sample has been confirmed from XRD analysis. Uniform distribution with small amount of porosity has been confirmed from SEM analysis. John–Teller mode is observed at 616 cm⁻¹ (B_1g) in the Raman spectrum of GdMnO₃ sample. The optical band gap value of the synthesized GdMnO₃ sample is found to be 3.22 eV which indicates the insulating behavior of the sample. An elevated dielectric constant value with increase in temperature and a very negligible dielectric loss is observed for the synthesized sample which makes its applications in memory storage devices. The room temperature dielectric constant value of GdMnO₃ is found to be 649 with dielectric loss factor of 1.73 at 1 kHz frequency which is comparatively higher that of the dielectric constant values already reported. The dielectric constant value at 500 °C is found to be 44,112 with loss factor 1.04 at 1 kHz frequency that it has more significant high temperature applications. Complex impedance and modulus studies confirm the relaxation mechanism as Non-Debye type relaxation.

Key words: GdMnO₃ · Structural properties · Dielectric properties · AC conductivity · Impedance analysis · Optical properties