0.25Ce 0.5TiO 3 -xLa(Mg 0.5Ti 0.5)O 3 based microwave dielectric ceramics for 5G architecture]]>

摘要

The crystal structure and microwave (MW) dielectric characteristics of the compound in the perovskite type series (1-x) (Sr0.25Ce0.5TiO3)-xLa(Mg0.5Ti0.5)O3,x?=?0.0 to 0.6 have been studied. The structural phase evolutions from orthorhombic (forx?=?0.0) to cubic (forx?≥?0.15) as a function of La(Mg0.5Ti0.5)O3have been investigated and are related to variation in the dielectric characteristics. Forx?=?0.0, the electron diffraction (TEM) revealed that Sr0.25Ce0.5TiO3compound were tilted in both anti-phase and anti-parallel displacement of A-site cation. The nonlinear trend of the temperature coefficient of resonant frequency (τf) vs dielectric constant resulted from the tilted (forx?=?0.0) to nontilted (forx?≥?0.15) structure transition. The value ofτfdecreases markedly from?+194?ppm/°C (x?=?0.0) to?+?0.8?ppm/°C (x?=?0.6), but theQ?×?fvalue (Q-factor) increases from 19,238?GHz to 37,508?GHz. Low loss microwave (MW) dielectric properties:εr?=?47.0,Q?×?f?=?37508?GHz andτf?=?+15?ppm/°C andεr?=?39,Q?×?f?=?34098?GHz andτf?=?+0.8?ppm/°C were achieved for compositions withx?=?0.45 and 0.6.