Effects of CaSiO3 addition on sintering behavior and microwave dielectric properties of Al2O3 ceramics

Crystallization mechanisms and properties of α-cordierite glass–ceramics from K2O–MgO–Al2O3–SiO2 glasses

“…The dielectric constants of the glass-ceramics vary with the chemical composition of the glasses as well as the sintering temperature. Many factors influence the dielectric constant of the materials [33][34][35], mainly the crystalline phases, crystallinity, chemical composition of the residual glassy phase, grain size, porosity, etc. In this work, the crystalline phase, chemical composition of the residual glassy phase and the porosity are the factors determining the dielectric constant of the glass-ceramics.…”

Novel middle permittivity ceramic Ba4CoTi11O27: Sintering characteristic, cations distribution, crystal structure and microwave dielectric properties

“…Generally, microwave dielectric materials are separated into two groups according to the dielectric properties. One is characterized by a low permittivity and high quality factor, such as Al 2 O 3 [1], aluminate [2][3][4], phosphates [5,6], and silicate [7][8][9]. The other is represented by a high permittivity and moderate quality factor, such as TiO 2 , BaO-Re 2 O 3 -TiO 2 , and Li 2 O-TiO 2 -Nb 2 O 5 systems [10][11][12][13].…”

“…For the application of dielectric resonators (DRs), microwave dielectric ceramics should have following features: (1) sufficiently high permittivity to allow the miniaturization of the component (ε410); (2) high quality factor to improve the selectivity (Q45000, where Q¼ 1/tanδ); (3) near zero temperature coefficient of resonator frequency (τ f o 720 ppm/1C) for stability. Generally, microwave dielectric materials are separated into two groups according to the dielectric properties.…”

Structure and optical properties of Sn4+ doped Ba(Mg1/3Nb2/3)O3 transparent ceramics

“…Ba(Mg 1/3 Nb 2/3 )O 3 (BMN), a complex perovskite, is a type of microwave dielectric material that exhibits a much higher permittivity (32) than that of Al 2 O 3 (9.8) [8,9], providing the application potential of a high refractive index material. It is known that BMN exists in both ordered and disordered forms, with hexagonal and cubic symmetry, respectively [10].…”