Abstract
Y-type hexagonal ferrite with planar magnetocrystalline anisotropy has ultrahigh cut-off frequency up to GHz and excellent magnetic properties in hyper frequency range, so that is regarded as the most suitable material in correpongding inductive devices and components. The technology of low temperature cofired ceramics for surface-mounted multilayer chip components needs ferrite to be sintered well under 900 ℃ to avoid the melting and diffusion of Ag inner electrode during the cofiring process. To lower the sintering temperature of Y-type hexagonal ferrite, there are several methods, (1) using nano-sized starting powders, (2) substitution by low-melting elements, (3) adding sintering additives, and (4) introducing lattice defect. In this paper, the effects of different methods on the sintering behavior and the magnetic properties were discussed in detail.
Highlights
With the development of modern electronic technology, the fast spread of portable electronic products promotes the trends of electronic technology towards miniaturization, integration and high frequency
The development of computer and wireless technology creates a great demand for novel chip inductive devices in hyper frequency, which need the magnetic material has excellent electromagnetic properties in hyper frequency
For multilayer chip inductive components, such as multilayer chip inductor (MLCI) and multilayer chip beads (MLCB), Ag is the best choice as inner electrode, due to high electric and thermal conductivity
Summary
With the development of modern electronic technology, the fast spread of portable electronic products promotes the trends of electronic technology towards miniaturization, integration and high frequency. Using smaller starting particles with larger surface area, so using nano-sized particles, instead of micron-sized, can promote the sintering process and lower the sintering temperature It benefit the mass transfer in sintering process, which is affected by the change in pressure and differences in free energy across the curved surface [11]. These effects become larger in magnitude if the size of the particle is smaller, especially in nanoscale. The high activity of nano-sized powder promotes the mass transfer and solid state reaction, so the phase formation temperature is lowered obviously. The shrinkage rate is much larger than that of the sample
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