Probing structural, surface morphological, optical, low temperature magnetic studies and electrochemical studies on gadolinium tellurite (GdTeO₃)

Abstract

Gadolinium tellurite (GdTeO3) has been synthesized by hydrothermal process. It displays both tiny nanorods and spherical particles embedded in a structure resembling flakes. Using a particle size analyzer, the size of the particle is found to be 142.5 nm. GdTeO3 has a cubic structure. Urbach energy is 0.4566 eV, energy gap is 5.797 eV, and refractive index is 1.890. The sample is suitable as UV filter and an effective applicant of optoelectronics. The bands observed in UV spectrum are assigned with the transitions between energy levels of Gd and attributed to different surface defects. The bands seen in the spectrum are linked to Gd’s energy level transitions and have various surface imperfections. The sample contained tellurite in an oxide matrix containing gadolinium. Magnetic analysis indicates that GdTeO3 may be undergoing a phase transition and may contain a small impurity. At 300 K, the M−H curve demonstrates paramagnetic and weak ferromagnetic characteristics with aligned cooperative Gadolinium spins. Pseudocapacitive behavior is shown by the cyclic voltammogram and Cp analysis. The sample exhibits 0.90 V potential window. It has been observed that specific capacitance is 139.34 Fg−1 from cyclic voltammogram and 112.93 Fg−1 from Cp analysis. Analysis of impedance reveals a pseudo-capacitive character.