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Multiferroic properties of lead-free Ni0.5Zn0.5Fe1.9O4-δ-Na0.5Bi0.5TiO3 composites synthesized by spark plasma sintering
Published in Elsevier Ltd
2015
Volume: 41
   
Issue: 5
Pages: 6882 - 6888
Abstract
Multiferroic composites of x Ni0.5Zn0.5Fe1.9O4-δ-(1-x) Na0.5Bi0.5TiO3 (x NZF-(1-x) NBT, where x=0.05, 0.15 and 0.25 mol fraction) were synthesized by spark plasma sintering (SPS) in conjunction with high-energy ball milling. The presence of NZF and NBT phases in the composites was confirmed by X-ray diffraction. The dielectric constant was studied as a function of frequency (0.5 kHz to 1 MHz) and temperature (30-500 °C). It was found that the 0.25 NZF-0.75 NBT composite possessed the most promising dielectric properties with its dielectric constant being 5-10 times higher than those for the other two composites in the full range of frequency. The magnetic and ferroelectric properties were examined at room temperature and all composite samples exhibited both pronounced ferromagnetic and ferroelectric characteristics. A maximum ME voltage coefficient of ∼870 μV/cm Oe was obtained at the magnetic field of ∼1.25 kOe for the 0.25 NZF-0.75 NBT composite, which was well comparable with the ME output for the lead-containing NZF-PZT composites. © 2015 Elsevier Ltd and Techna Group S.r.l.
About the journal
JournalData powered by TypesetCeramics International
PublisherData powered by TypesetElsevier Ltd
ISSN02728842
Open AccessNo
Concepts (20)
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    Ball milling
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    Dielectric properties
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    Electric sparks
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    Ferroelectricity
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    GYRATORS
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    Nickel
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    Sintering
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    Sodium
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    Spark plasma sintering
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    X ray diffraction
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    Zinc
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    Composite samples
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    FERROELECTRIC CHARACTERISTICS
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    Ferroelectric property
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    Function of frequency
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    HIGH-ENERGY BALL MILLING
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    ME VOLTAGE COEFFICIENTS
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    MULTIFERROIC COMPOSITES
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    Multiferroic properties
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    Dielectric properties of solids