Effect of space charge on dielectric and magneto-dielectric behaviors in Ba0.85Ca0.15Zr0.1Ti0.9O3/La0.67Sr0.33MnO3 heterostructure. Issue 12 (15th August 2018)

• Record Type: Journal Article
• Authors: Guo, S.J.; Luo, B.C.; Pei, H.Y.; Chen, C.L.; Jin, K.X.
• Is Part Of: Ceramics international. Volume 44:Issue 12(2018)
• Page Start: 14286
• Page End: 14290
• Publication Date: 2018-08-15
• Subjects: Dielectric relaxation -- Magneto-dielectric effect -- Space charge -- Ba0.85Ca0.15Zr0.1Ti0.9O3; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.05.033
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The Ba0.85 Ca0.15 Zr0.1 Ti0.9 O3 /La0.67 Sr0.33 MnO3 (BCZT/LSMO) heterostructures were deposited on LaAlO3 (111) substrates through radio-frequency magnetron sputtering technique. Dielectric behaviors as a function of frequency, temperature and magnetic field were investigated. The frequency dependence of dielectric permittivity exhibited apparent relaxation behavior. The corresponding activation energy estimated from Arrhenius plot was 2 meV. Abnormal point at 120 K was detected from the real part of dielectric permittivity vs temperature plot and magnetodielectricity (MD) vs temperature plot simultaneously, which refer to rhombohedral to orthorhombic phase transition in BCZT. A maximum of 20 percent was obtained in MD-temperature pattern, indicating obvious magneto-electric (ME) coupling. The dielectric permittivity relaxation phenomena as well as magneto-dielectric effect can be ascribed to the role of space charges, which arise at interface of BCZT and LSMO owing to lattice mismatch. The dependence of magneto-dielectric on temperature results from the variation of lattice mismatch degree induced by phase transition of BCZT.