Influence of the Preparation Conditions and Percolation Threshold on the Properties of Lead Zirconate Titanate/Cobalt Nickel Ferrite Magnetoelectric Composites
- Authors: Lisnevskaya I.V.1, Levshina N.A.1
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Affiliations:
- Southern Federal University
- Issue: Vol 54, No 8 (2018)
- Pages: 851-858
- Section: Article
- URL: https://journals.rcsi.science/0020-1685/article/view/158512
- DOI: https://doi.org/10.1134/S0020168518080113
- ID: 158512
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Abstract
We have prepared magnetoelectric (ME) composite ceramics, free of foreign phases, in the lead zirconate titanate–cobalt nickel ferrite two-phase system: xPZT-36 + (100–x)Ni0.9Co0.1Fe2O4. The sol–gel derived ferrite powder used in our preparations seems to be doped with titanium cations from the PZT-36. The ceramics have a percolation threshold at x = 50–70 wt %, which is due to the increased electrical conductivity of Ni0.9Co0.1Fe2O4. As a consequence, the piezoelectric parameters of the ME ceramics drop sharply at x < 50–70 wt %: the piezoelectric moduli |dij| and piezoelectric voltage coefficients |gij| decrease by a factor of 3–5 in this composite range. The piezoelectric parameters |dij| and |gij| of the composites produced using the fine ferrite powder exceed those of the materials prepared using macrocrystalline Ni0.9Co0.1Fe2O4 powder by more than a factor of 2. The piezoelectric voltage coefficient g33 correlates with the ME coefficient ΔE/ΔH. The highest ME conversion efficiency (up to 45 mV/(cm Oe)) is offered by the 80 wt % PZT-36 + 20 wt % Ni0.9Co0.1Fe2O4 composites, whose composition lies in a subpercolation region. Even though the composites produced using the fine ferrite powder possess improved piezoelectric properties, they have smaller ΔE/ΔH coefficients (no greater than 25 mV/(cm Oe)), which can be tentatively attributed to the degradation of the properties of the ferrite as a consequence of doping with Ti4+ cations during the sintering of the composite ceramics.
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About the authors
I. V. Lisnevskaya
Southern Federal University
Author for correspondence.
Email: liv@sfedu.ru
Russian Federation, ul. Zorge 7, Rostov-on-Don, 344090
N. A. Levshina
Southern Federal University
Email: liv@sfedu.ru
Russian Federation, ul. Zorge 7, Rostov-on-Don, 344090
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