Stress development during co‐firing a multilayer dielectric material of Bi2(Zn1/3Nb2/3)2O7 (BZN) and magnetic material of (Ni0.3Cu0.1Zn0.6O)‐(Fe2O3)0.8 (NiCuZn ferrite) laminate has been investigated by measuring camber development and shrinkage rate difference. The trend of camber development follows a similar pattern to the linear shrinkage rate difference between NiCuZn ferrite and BZN. No co ‐firing defects are observed in the multilayer structure of NiCuZn ferrite and BZN laminates, which is attributed to good sintering compatibility between these two ceramics, and the sintering mismatch stress generated in the laminate much less than those of sintering potentials.
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.
A low‐fire Ni–Cu–Zn ferrite+dielectric ceramic composite and its multilayer integrated laminate, which can be densified at temperatures below 900°C, is prepared. To densify Ni–Cu–Zn ferrite at low temperatures, the dielectric needs to contain an effective sintering flux of Bi2O3 or PbO to the Ni–Cu–Zn ferrite. This enables densification of the resulting ceramic composite or multilayer integrated dielectric/ferrite laminate at temperatures close to those of pure ferrite and dielectric. The dielectric constant decreases but the initial permittivity increases with increasing amount of ferrite existing in the ferrite+dielectric ceramic composite.
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