Effect of Holmium Doping in Ba₅RTi₃V₇O₃₀ (R = Rare Earth Element) Compound

Abstract

O 30 compound has been prepared by solid-state reaction technique. Compound is found to be single phase by XRD studies. SEM study indicates average grain size to be ∼3 µm. Dielectric studies carried out in temperature regime RT-773 K and frequency range 1 Hz-100 kHz, show ferroelectric phase transition at 550 K at 100 kHz. The impedance spectra show three distinct regions in temperature range 543-663 K corresponding to electrode polarization, grain boundary and grain interior contributions and indicate ionic behavior. The activation energy has been evaluated following Arrhenius equation to be 0.51 eV.

Structural and electrical studies of Ba5LaTi3V7O30 compound

“…Similar trend in variation of dielectric constant with temperature was observed in the values for all the measured frequencies. The above anomaly is consistent with that observed in earlier article also [16]. The broadening of the dielectric peak may be considered due to heterogeneity in the composition, voids and defects present in the compound and thus a distribution of different Curie points results.…”

“…The shape, size and distribution of grains in the microstructure suggest that the sample has polycrystalline nature. Similar microstructures are observed with that of some other materials of this family [16].…”

“…But the problem with this compound is that it can only be sintered at high temperature (~1473 K) in order to form required phase with desired properties. In recent studies, it has been shown that the replacement of niobium with vanadium in Ba 5 RTi 3 V 7 O 30 (R0Ho) brings down sintering temperature considerably (~1073 K) [16]. Although the structural and dielectric properties of Ba 5 HoTi 3 V 7 O 30 [16] has examined; in this paper we reporting the structural, microstructural, dielectric and electrical conductivity of Ba 5 LaTi 3 V 7 O 30 ceramic synthesized by solid state reaction.…”

Characterization of Electrical Behavior of Ba<sub>5</sub>HoTi<sub>3</sub>V<sub>7</sub>O<sub>30</sub> Ceramic Using Impedance Analysis

“…These compounds show many interesting properties like diffuse phase transition with wide variation of transition temperature. One such compound which has drawn our attention is Ba 5 HoTi 3 V 7 O 30 (BHTV) which has already been examined elsewhere [16] and some of its properties have been reported. To know more about this compound and to explore its application, we have summarized the structural, impedance and modulus properties of the BHTV compound in this paper.…”

Interdependence between electrical and magnetic properties of polycrystalline cobalt-substituted tungsten bronze multiferroic ceramics

“…The detailed literature study reveals that a lot of work has been carried out on various TB ferroelectric ceramics of niobates, tantalates and vanadates having tetragonal TB (TTB) structure. Kiran et al 10 have synthesized Ba 5 in their stoichiometric proportions. The powder mixture was thoroughly grinded by an agate mortar for 7-8 h and then passed through sieve of 75 micron meter.…”