Development and application of ferrite materials for low temperature co-fired ceramic technology

Abstract

Development and application of ferrite materials for low temperature co-fired ceramic (LTCC) technology are discussed, specifically addressing several typical ferrite materials such as M-type barium ferrite, NiCuZn ferrite, YIG ferrite, and lithium ferrite. In order to permit co-firing with a silver internal electrode in LTCC process, the sintering temperature of ferrite materials should be less than 950 ∘ C. These ferrite materials are research focuses and are applied in many ways in electronics.

Phase and magnetic properties evolutions of Y3−x(CaZr)xFe5−xO12 by the sol–gel method

“…At room temperature, the three sublattice moments align along the [111] direction. The magnetic moment generated from Y 3 þ is very tiny, so the total magnetic moment can nearly be expressed by formula (1). The direction of the total magnetic moment is the same as that of d site.…”

“…Yttrium iron garnet (YIG, Y 3 Fe 5 O 12 ) materials are interesting ferromagnetic materials because of their good soft-magnetic properties and high resistivity, and show potential application in microwave devices such as phase shifter, isolator, circulator and antenna [1]. YIG is cubic structure (space group Ia3d), in which O 2 À is closed-packing arrangement, and the cations fill in the interspace of O 2 À forming three sub-lattices: dodecahedron, octahedron and tetrahedron.…”

Magnetic and microwave absorbing properties of low-temperature sintered BaZrxFe(12−x)O19

“…At present, there are several common methods for synthesizing barium ferrite, such as the dynamic hydrothermal method, 6 co-precipitation method, 7 high-energy ball milling method, 8 sol–gel method 9 and so on. However, in order to form the crystalline structure of barium ferrite, the sintering temperature of these methods is usually higher than 1200 °C, 10 which limits the application of barium ferrite in low temperature co-fired ceramic (LTCC) technology. LTCC technology is an important technology to realize the miniaturization and integration of portable communication devices (such as mobile phones) and wave absorbing devices (such as filters).…”

Low-temperature co-fired Ni–Ti co-substituted barium ferrites

“…It is known that it needs high sintering temperature of about 1200 C for barium ferrite to form single crystalline structure. 16 However, it requires a low-temperature sintering process (<961 C) in multilayer devices technology. The sintering temperature of barium ferrite is too high so that it cannot be applied to low-temperature co-fired technology.…”