Electrical Properties of Low-Fire Ferroelectric+Ferrimagnetic Ceramic Composite

Abstract

A low-fire, densified ferroelectric+ferrimagnetic ceramic composite consisting of Pb(Ni1/3Nb2/3)O3–PbZrO3–PbTiO3 (PNZT) and Ni–Cu–Zn ferrite powders is prepared at temperatures below 900 °C. The low-fire densification behavior is attributed to the migration of PbO from PNZT into Ni–Cu–Zn ferrite, enhancing the sintering compatibility between PNZT and ferrite. This in turn promotes the densification of the binary composite taking place at temperatures close to those of pure PNZT and Ni–Cu–Zn ferrite. For all compositions investigated, no new phases except the initial ferroelectric PNZT and ferrimagnetic Ni–Cu–Zn ferrite were detected in the ceramic composites. Both the saturation polarization in the polarization-electric field hysteresis curves and the dielectric constant of the binary PNZT+ferrite composite increase with increasing ferroelectric PNZT content. With increasing ferrimagnetic Ni–Cu–Zn ferrite content in the composite, the coercive magnetic field decreases but the saturation magnetization and initial permeability increase.

Tunneling magnetoresistance in BaTiO₃/Fe₃O₄ composites

“…In the most of composite material studies, these spinel ferrite and insulator components are separately synthesized and then composite materials are formed. [28][29][30][31][32][33][34][35][36] This is, however, slightly complicated since it is the sum of two syntheses for spinel ferrite and insulator materials. 37,38) In this study, previously-unreported BaTiO 3 /Fe 3 O 4 composites where BaTiO 3 was employed as the insulating barriers were prepared using a direct solid-state reaction of raw materials (BaCO 3 , TiO 2 , and Fe 3 O 4 ).…”

Low temperature fired and electromagnetic properties of a novel ferroelectric/ferromagnetic composite material

“…[1][2][3][4][5][6][7][8][9][10][11][12]. There are many researches focus on combining Ni-Zn or Ni-Cu-Zn ferrites with different ferroelectric materials such as BaTiO 3 [3][4][5][6][7], Ba x Sr (1−x) TiO 3 [8], Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMZNT) [9], 0.8Pb(Ni 1/3 Nb 2/3 )O 3 -0.2PbTiO 3 (PNNT) [10], Pb(Ni 1/3 Nb 2/3 )O 3 -PbZrO 3 -PbTiO 3 (PNZT) [11], and various composite materials showing simultaneous ferroelectric and ferromagnetic characteristics have been successfully prepared. Meanwhile, to meet the requirements of miniaturization and excellent high frequency performance of the electronic devices, the ceramic materials that can adapt to the high level of passive integration are needed.…”

“…Hence, developing the ceramic composite materials which can be cofired with low-melting internal electrodes, such as Ag [13], is also required. Some methods including addition of low-melting oxides or glasses [5][6][7]14] and using low-melting ceramic as a component of the composite [9][10][11] have been employed to decrease the sintering temperature. In our previous works, we aim to realize the low temperature sintering of the BaTiO 3 /Ni-Cu-Zn ferrite composites with different fluxing agents [6,7].…”

Magnetic and Electronic Properties of BaTiO3–(Ni,Cu,Zn)Fe2O4Ceramic Composite: Reflection of Kepler Conjecture

“…Therefore, the composite materials have been intensively studied, through both -fundamental studies to understand their physical properties, and through synthesis of composites with various chemical formula components to find new functional properties. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Ferromagnetic iron oxides (ferrites) and ferroelectric/ dielectric titanates are good candidates for the components since they have been widely used in microwave and millimeter wave devices. The typical ferrite with a chemical formula of MFe 2 O 4 has a cubic spinel crystal structure, where M can be magnesium, manganese, iron, cobalt, nickel, copper or zinc divalent cation.…”