Superior electromagnetic properties obtained by enhanced resistivity on multiferroic barium titanate and hexaferrite di-phase composite ceramics

Gao, Ziyan; Pu, Yongping; Yao, Mouteng; Qian, Jin; Wang, Yaru; Zheng, Hanyu

doi:10.1016/j.ceramint.2017.05.233

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…The activation energies E a of the composite samples are 0.58 eV (for PFN-F), 0.87 eV (for PFNM 1 -F), and 0.80 eV (for PFNM 2 -F). In the ferrites, conductivity is connected with the hopping of charge carriers between the iron ions in different valence states [ 59 , 60 ], whereas in the perovskite materials, it is connected among others with presence of oxygen and lead vacancies and defect dipolar effects [ 61 , 62 ]. The calculated E a values mainly indicate conductivity dominated by the presence of oxygen vacancies in the multiferroic composite samples [ 61 ].…”

Section: Resultsmentioning

confidence: 99%

Electric and Magnetic Properties of the Multiferroic Composites Made Based on Pb(Fe1/2Nb1/2)1−xMnxO3 and the Nickel-Zinc Ferrite

2023

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This work presents the electrophysical properties of the multiferroic ceramic composites obtained as a result of combining both magnetic and ferroelectric material. The ferroelectric components of the composite are materials with the following chemical formulas: PbFe0.5Nb0.5O3 (PFN), Pb(Fe0.495Nb0.495Mn0.01)O3 (PFNM1), and Pb(Fe0.49Nb0.49Mn0.02)O3 (PFNM2), while the magnetic component of the composite is the nickel-zinc ferrite (Ni0.64Zn0.36Fe2O4 marked as F). The crystal structure, microstructure, DC electric conductivity, and ferroelectric, dielectric, magnetic, and piezoelectric properties of the multiferroic composites are performed. The conducted tests confirm that the composite samples have good dielectric and magnetic properties at room temperature. Multiferroic ceramic composites have a two-phase crystal structure (ferroelectric from a tetragonal system and magnetic from a spinel structure) without a foreign phase. Composites with an admixture of manganese have a better set of functional parameters. The manganese admixture increases the microstructure’s homogeneity, improves the magnetic properties, and reduces the electrical conductivity of composite samples. On the other hand, in the case of electric permittivity, a decrease in the maximum values of εm is observed with an increase in the amount of manganese in the ferroelectric component of composite compositions. However, the dielectric dispersion at high temperatures (associated with high conductivity) disappears.

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Section: Resultsmentioning

confidence: 99%

Electric and Magnetic Properties of the Multiferroic Composites Made Based on Pb(Fe1/2Nb1/2)1−xMnxO3 and the Nickel-Zinc Ferrite

2023

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“…Generally, in the case of perovskite-type materials, DC conductivity is mainly associated with oxygen and lead vacancies, defect dipolar effects, etc. [ 76 , 77 ], whereas, in the case of ferrite materials, it is connected with the hopping mechanism [ 78 , 79 ]; i.e., the hopping of charge carriers between the iron ions available in different valence states [ 80 ]. Volatile components can easily create the oxygen vacancies (V O ) at high temperatures during sintering, leading to the creation of singly/doubly ionized oxygen vacancies

, an ionization of which creates conducting electrons [ 75 ].…”

Section: Resultsmentioning

confidence: 99%

“…The ε ″ (dielectric loss) represents the energy loss and occurs when the polarization shifts behind the applied electric field caused by the grain boundaries [ 82 ]. In dielectric materials, the dielectric loss originates from the following factors: space charge migration (interfacial polarization contribution), DC direct current conduction, and the movement of the molecular dipoles (dipole loss) [ 78 ]. At RT , the tan δ values of multiferroic composite samples ( Table 1 ) are in the range of 0.013–0.016 (compared with P ceramics, tan δ = 0.013 at RT ).…”

Section: Resultsmentioning

confidence: 99%

Influence of the Sintering Method on the Properties of a Multiferroic Ceramic Composite Based on PZT-Type Ferroelectric Material and Ni-Zn Ferrite

2022

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This paper presents the research results of multiferroic ceramic composites obtained with three sintering methods, i.e., free sintering FS (pressureless), hot pressing HP, and spark plasma sintering SPS. The multiferroic composite was obtained by combining a ferroelectric material of the PZT-type (90%) and zinc-nickel ferrite (10%). Research has shown that the combination of a magnetic material and ferroelectric materials maintains the multiferroic good ferroelectric and magnetic properties of the composites for all sintering methods. A sample sintered with the HP hot pressing method exhibits the best parameters. In the HP method, the composite sample has high permittivity, equal to 910 (at room temperature) and 7850 (at the phase transition temperature), residual polarization 2.80 µC/cm2, a coercive field of 0.95 kV/mm, and the magnetization of 5.3 and 4.95 Am2/kg at −268 °C and RT, respectively. Optimal technological process conditions are ensured by the HP method, improving the sinterability of the ceramic sinter which obtains high density and proper material compaction. In the case of the SPS method, the sintering conditions do not allow for homogeneous growth of the ferroelectric and magnetic component grains, increasing the formation of internal pores. On the other hand, in the FS method, high temperatures favor excessive grain growth and an increase in the heterogeneity of their size. In obtaining optimal performance parameters of multiferroic composites and maintaining their stability, hot pressing is the most effective of the presented sintering methods.

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Dielectric properties, complex impedance analysis and electrical properties of novel particulate composites of NBT-SrFe12O19

Dagar

Hooda

Khasa

2020

J Mater Sci: Mater Electron

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Superior electromagnetic properties obtained by enhanced resistivity on multiferroic barium titanate and hexaferrite di-phase composite ceramics

Cited by 8 publications

References 23 publications

Electric and Magnetic Properties of the Multiferroic Composites Made Based on Pb(Fe1/2Nb1/2)1−xMnxO3 and the Nickel-Zinc Ferrite

Electric and Magnetic Properties of the Multiferroic Composites Made Based on Pb(Fe1/2Nb1/2)1−xMnxO3 and the Nickel-Zinc Ferrite

Influence of the Sintering Method on the Properties of a Multiferroic Ceramic Composite Based on PZT-Type Ferroelectric Material and Ni-Zn Ferrite

Dielectric properties, complex impedance analysis and electrical properties of novel particulate composites of NBT-SrFe12O19

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