Synthesis and Characterization of Multiferroic Composites Based on Manganate Perovskite Ceramics
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Synthesis and Characterization of Multiferroic Composites Based on Manganate Perovskite Ceramics Gonbao Song1, Jian Li2, and Andrei Kholkin1 1 DECV and CICECO, University of Aveiro, Aveiro, 3810-193, Portugal 2 DECV and CICECO, Aveiro, 3810-193, Portugal Synthesis and characterization of multiferroic composites based on manganate perovskite ceramics Gongbao Song1, 2, Landong Miao2, Jian Li1 and A. L. Kholkin1 1 Department of Ceramics and Glass Engineering & CICECO, University of Aveiro, 3810-193 Aveiro, Portugal 2 School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang, 621002, China Abstract: In this paper, phase separation and crystal structure of (x) La0.625Sr0.375MnO3 – (1-x) LuMnO3 system (LSMO-LMO), and (1-x) La0.9Ca0.1MnO3-(x) LuMnO3 system (LCMO-LMO) were studied by XRD and SEM. The results confirm that there are solid solutions in both of these two systems. There is a solid solution of monoclinic phase of space group P1121/a for x=0.980~1.0 in LSMO-LMO system. There is a solid solution of hexagonal phase of space group P63cm for x=0.0~0.24 in LCMO-LMO. Selected compositions were tested in terms of their magnetization, dielectric constant and ferroelectric properties at low temperatures. Key words: manganites, composite, solid solution, multiferroics 1 Introduction Muliferroic composites consist of ferromagnetic (FM) or antiferromagnetic (AFM) components intimately mixed with a ferroelectric (FE) material. High magnetoelectric coupling can be achieved via, e. g., magnetostrictive strain that is expected to modulate the properties of a ferroelectric. The ability to provide this modulation may lead to a variety of future potential devices including magnetic-field-tunable microwave resonators or magnetically switchable ferroelectric memories [1]. Since the first multiferroic material was discovered, many compounds were found to have multiferroic properites, such as Cr2O3 [2], Ti2O3 [3], GaFeO3 [4], boracites [5], phosphates [6], PbFe0.5Nb0.5O3 [7]. In the past few years, there has been renewed interest in studying the perovskite-based multiferroic materials, such as rare earth manganates YMnO3, which have higher Curie temperatures and larger magnetoelectric effects. The manganate-type perovskites compounds are long time known to crystallize in two structural phases: a cubic phase (or close to it) and a hexagonal phase. This gives a possibility of forming not only a solid solutions but immiscible phase-separated composites. While investigating the doping effect of small Lu ions to (La,Sr)MnO3, Park et al. [8] discovered that a chemical immiscibility exists between FM-metallic (La,Sr)MnO3 (LSMO) and FE LuMnO3 (LMO). In this work, we investigated the effect of immiscibility in solid solutions LSMO and (La,Ca)MnO3 (LCMO) with LMO. The solid solubility and crystal structure were studied in detail. X-ray, SEM were used to
characterize the crystal structure and microstructure of sintered samples. Selected compositions were tested in terms of their magnetizati
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