Influences of Li 2 O–B 2 O 3 –SiO 2 Glass Addition on Microstructural and Magnetic Properties of LiZnTi Ferrites

Recently, a lot of research has been focusing on the surface mounted microwave gyromagnetic devices fabricated by low-temperature cofired ceramics (LTCC) technique [1-2]. LiZnTi-ferrite materials have been widely applied in microwave gyromagnetic devices, such as circulator, phase shifter in the electronically scanned phased array antennae, due to its low coercivity (Hc), appropriate saturation flux density (Bs) and dielectric constant, all of which can be tailored by various doping strategies [3]. But its high sintering temperature restrains its application in chip microwave gyromagnetic devices. Some low melting point glasses have been used to meet the requirements of sinterability for LTCC technology. The Li 2 O-B 2 O 3 -SiO 2 (LBS) glasses are usually used as a suitable additive for lowing the sintering temperature and dielectric loss of some microwave ceramics, making them suitable for LTCC application [4]. In this paper, the effects of Li 2 O-B 2 O 3 -SiO 2 (LBS) glass addition on the microstructures and properties of low-temperature fired LiTiZn-ferrites have been studied.