Low-Temperature Magnetic Phase Transition and Dielectric Relaxation Mechanism in Triclinic Niv2o6

Abstract

In the present work, we report the synthesis, structural characterization, and magnetic and dielectric response of NiV2O6 prepared by solid-state techniques to explore its magnetic phase transition, and dielectric relaxation mechanism. The Rietveld refinement of the X-ray diffraction (XRD) pattern of NiV2O6 reveals the single-phase triclinic crystal structure with space group P-1. The chemical compositions and surface electronic states from X-ray photoelectron spectroscopy (XPS) confirm the Ni2+, V4+, and V5+ (mixed valence), which significantly affect the magnetic and electric characteristics of NiV2O6. The magnetization vs. temperature (M-T) graphs of NiV2O6 at a dc magnetic field of 100 Oe exhibit a paramagnetic to antiferromagnetic transition (TN) at 16.3K, and the inverse susceptibility fitted by Curie-Weiss law yielded a paramagnetic moment ~3.25µB and Weiss constant [[EQUATION]]=-16.3 K. The dielectric constant (εr) increases with temperature due to the contribution of dipolar or ionic polarization at various temperatures from 80K to 325 K.

Keywords: Low-dimensional vanadate, Structural study, Low temperature magnetic responses, dielectric spectroscopy