Integration of Ni-Cu-Zn and Hexagonal Ferrites into LTCC Modules: Cofiring Strategies and Magnetic Properties
نویسندگان
چکیده
We have studied the integration of Ni-Cu-Zn ferrite spinels as well as substituted hexagonal Co2Y-and M-type ferrites into LTCC (Low Temperature Ceramic Co-firing) modules. The cofiring behavior and the magnetic properties of these materials were investigated and evaluated for multilayer applications. Ni-Cu-Zn ferrites exhibit permeabilities of μ = 300 – 500 for operating frequencies in the MHz range. Cu-substituted Y-type ferrites Ba2Co2-x-yZnxCuyFe12O22 in combination with sintering additives display sufficient shrinkage and densification at 900°C. A permeability of μ = 10 is observed; however, substituted Co2Y-type ferrites do not exhibit long-term stability at 900°C. Co/Ti-substituted M-type ferrites BaFe12-2yCoyTiyO19 (y = 1.2) with planar magneto-crystalline anisotropy exhibit excellent soft magnetic behavior. Using sintering additives, complete densification is reached at 900°C and a permeability of μ = 15 and a resonance frequency of larger than 1 GHz are observed. Integration of ferrite multilayer inductor components into LTCC modules using free and constrained cofiring technologies is demonstrated.
منابع مشابه
Temperature dependence of core loss in cobalt substituted Ni-Zn-Cu ferrites
The temperature dependence of core loss in cobalt substituted Ni-Zn-Cu ferrites was investigated. Co ions are known to lead to a compensation of the magnetocrystalline anisotropy in Ni-Zn ferrites, at a temperature depending on the cobalt content and the Ni / Zn ratio. We observed similar behaviour in Ni-Zn-Cu and it was found that the core loss goes through a minimum around this magneto-crysta...
متن کاملUnexpected Behavior of Copper in Modified Ferrites during High Temperature WGS ReactionAspects of Fe ↔ Fe Redox Chemistry from Mössbauer and XPS Studies
We report dynamic alternation of the redox chemistry of the Fe/ Fe couple in magnetite during high temperature water−gas shift reaction in Cu codoped Mmodified ferrite catalysts. Various hematitic solid solutions of the type Fe2O3−MxOy−CuOx with M = Cr, Ce, Ni, Co, Mn, and Zn are synthesized using the industrially economical and environmentally friendly coprecipitation method. Interestingly, Cu...
متن کاملStructural , Dielectric and Magnetic Behavior of Cu 2 + Substituted Ni - Zn Ferrite by Auto - combustion Technique
Structural and magnetic properties of Cu 2+ substituted Ni0.8-xCuxZn0.2Fe2O4 ferrites for x = 0.0 to 0.6 with the step increment of 0.2 prepared by an auto-combustion method have been investigated. The X-ray diffraction pattern of these compositions confirmed the formation of the single phase spinel structure. Further, the XRD have been used to calculate the lattice parameter and grain size. Th...
متن کاملClean Carrier Cores for Electrophotography
Most carrier cores for electrophotography are made from Cu-Zn or Ni-Zn ferrites. But in recent years, the use of these materials has been restricted by environmental regulations in many countries. In answer, we have developed clean carrier cores from environmentally iiiendly magnetic materials. One such material is magnetite, which we at FDK Corporation mass-produce by using an original product...
متن کاملبررسی خواص فیزیکی نانوذرات فریتNi-Cu-Znبهروش احتراق
In this paper 5 different samples of Ni-Cu-Zn nanoparticles (Ni0.8-xCuxZn0.2Fe2O4) with different compositions of x=0.2,0.4,0.6,0.8 synthesized through auto-combustion method using glycine as fuel and then structural, magnetic and optical properties of this samples investigated. Characterization of these samples done using XRD, FTIR, UV-Visible, SEM and SEM. XRD data proves existence of spine...
متن کامل