Magnetodielectric effect in EuZrO3

Abstract

Following recent report on antiferromagnetic ordering in EuZrO3 we performed dielectric measurements of this material as a function of temperature and magnetic field. Dielectric constant of dense EuZrO3 ceramics is 30.1 at 300 K. It gradually decreases upon cooling without any quantum paraelectric behavior; however, below TN=4.1 K it shows a pronounced drop that qualitatively resembles that observed in EuTiO3. We report that dielectric constant of EuZrO3 is magnetic field dependent. The magnitude of the magnetodielectric effect in both EuTiO3 and EuZrO3 is discussed in the light of the recently proposed coupling of the Eu–O–Eu superexchange interactions with electrons involved in partially covalent Ti(Zr)–O bond.

Evidence of Eu2+ 4f electrons in the valence band spectra of EuTiO3 and EuZrO3

“…Evidence of Eu 21 4f electrons in the valence band spectra of EuTiO 3 and EuZrO 3 T. Kolodiazhnyi We report on optical band gap and valence electronic structure of two Eu 2þ -based perovskites, EuTiO 3 and EuZrO 3 as revealed by diffuse optical scattering, electron energy loss spectroscopy, and valence-band x-ray photoelectron spectroscopy. The data show good agreement with the first-principles studies in which the top of the valence band structure is formed by the narrow Eu 4f 7 electron band.…”

“…Details of the SPS preparation of Eu 2þ -based perovskites are reported elsewhere. 3 The valence band structure were measured on a XPS Sigma Probe spectrometer (Thermo Scientific Co. Ltd., Yokohama, Japan) using monochromated Al Ka radiation (photon energy 1487 eV). The spectra were collected over a sufficient time to ensure a high signal to noise ratio.…”

“…Magnetodielectric effect in EuZrO 3 compound has been reported elsewhere. 3 The optical band gaps were calculated from the diffuse reflectance measurements by means of the diffuse reflectance spectroscopy. The spectra were recorded in the range of 250-800 nm with a UV-Vis spectrophotometer (Perkin Elmer, model k 650 S) equipped with a 150 mm integrated sphere using spectralon as a reference material.…”

Magnetodielectric effect in composites of nanodimensional glass and CuO nanoparticles

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Most of these materials fall into the category of multiferroics-a single phase material possessing both ferroelectric and ferromagnetic order.…”

The emergence of magnetic properties in (Pb0.845Sm0.08Fe0.035)(Ti0.98Mn0.02)O3 and (Pb0.88Nd0.08)(Ti0.98Mn0.02)O3 perovskite ceramics

“…The most known materials belonging to this category are EuTiO 3 , 11-13 (Eu,Ba)TiO 3 , 14 (Eu,Sr)TiO 3 , 15 and EuZrO 3 . 16 In this study, we have followed the last combination option, keeping the B-site of a ferroelectric perovskite (tetragonal PbTiO 3 (PT)) occupied by a ferroelectric d 0 ion and partially substituting the A-site with a magnetic R ion (as it has been previously shown, a rather large amount of R ion (at least 20%) can be substituted on the A-site of tetragonal ferroelectrics 17 ). Furthermore, we have pursued the enhancement of magnetic properties when a transition element cation with large ionic radius, like Fe 2þ (r ¼ 1.…”