Synthesis, structure, and magnetic and dielectric properties of magnetoelectric BaDyFeO4 ferrite

JOURNAL OF ALLOYS AND COMPOUNDS

卷:811

Article

Belik, Alexei A.¹  Terada, Noriki²  Katsuya, Yoshio³  Tanaka, Masahiko³  Glazkova, Iana S.⁴  Sobolev, Alexey, V⁴  Presniakov, Igor A.⁴  Yamaura, Kazunari^1,5 

[1] Natl Inst Mat Sci, Res Ctr Funct Mat, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan

[2] Natl Inst Mat Sci, Sengen 1-2-1, Tsukuba, Ibaraki 3050047, Japan

[3] NIMS, Synchrotron Xray Stn SPring 8, Kouto 1-1-1,Sayo Cho, Mikazuki, Hyogo 6795148, Japan

[4] Lomonosov Moscow State Univ, Dept Chem, Moscow 119992, Russia

[5] Hokkaido Univ, Grad Sch Chem Sci & Engn, Kita Ku, North 10 West 8, Sapporo, Hokkaido 0600810, Japan

关键词: Ferrites;    Magnetodielectric effect;    Multiferroics;    Crystal structure;   

DOI  :  10.1016/j.jallcom.2019.151963

来源: Elsevier

【 摘 要 】

BaDyFeO4 was prepared by a conventional solid-state method in air at 1573 K. It crystallizes in space group Pnma (No. 62) with a = 13.16861(1) angstrom, b = 5.70950(1) angstrom, and c = 10.26783(1) angstrom, and it is isostructural with BaYFe0 4 . Three magnetic transitions were found in BaDyFeO4 at T-N3 = 9 K, T-N2 = 23 K, and T-N1 =47 K in zero magnetic field in comparison with two magnetic transitions observed in BaYFeO4. Magnetic-field-induced transitions were also detected in BaDyFeO4 at 18 and 28 kOe (at T= 1.8 K). Frequency-dependent broad dielectric peaks were observed in BaDyFeO4 spanning between T-N2 and T-N and centred at 35 K - this temperature does not coincide with any T-N. No dielectric anomalies were found at T-N1 and T-N3, while very weak frequency-independent dielectric anomalies were detected at T-N2. Positive and negative magnetodielectric effects were measured in BaDyFeO4 (within a range of -0.8 and + 0.4% up to 90 kOe) reflecting magnetic-field dependence of dielectric constant. Pyroelectric current measurements did not detect any ferroelectricity in BaDyFeO4 under measurement conditions used. No dielectric anomalies and no magnetodielectric effects were found in BaYFeO4. (C) 2019 Elsevier B.V. All rights reserved.

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