Study on the composite and properties of Y 2O 3–TiO 2 microwave dielectric ceramics

Abstract

Various high and low permittivity dielectric material systems were studied frequently. However, middle permittivity dielectric ceramics with ɛ r values ranging from 40 to 80 were seldom reported. For adapting to the development of microwave communication technology, a new Y 2O 3–TiO 2 system ceramic was investigated in this paper. The effects of different k values on the properties of Y 2O 3– kTiO 2 ( k = 1, 1.5, 2, 2.5) microwave dielectric ceramics were studied by impedance analyzer, network analyzer, X-ray diffraction apparatus (XRD) and scanning electron microscope (SEM). It is shown that the major crystal phases of the samples are pyrochlore except when k value is 1. The ceramic with a optimal composition (Y 2O 3:TiO 2) sintered at 1460 °C exhibits the best dielectric properties: ɛ r ≈ 54, tan δ ≈ 9.0 × 10 −4 (1 MHz); ɛ r ≈ 54, Q· f = 6565.8 GHz (4.65 GHz), τ f = −31 ppm/°C.