【摘要】 SrTiO₃陶瓷是一种具有多功能特性的介质材料:用CeO₂掺杂改性的SrTiO₃陶瓷,可以提高其介电常数和降低介质损耗,对其介电温度特性和介电频率特性也有明显的改善。本文主要报道CeO₂对SrTiO₈陶瓷介电性质的影响。更多还原

【Abstract】 This paper mainly studied the influence of CeO₂ on the dielectric properties of SrTiO₃ ceramics. The SrTiO₃ ceramics containing CeO₂ have been pre pared by conventional ceramic process and the SrTiO₃ ceramic matrix powders have been prepared by pre-reacting stoichiomet ric mixture of strontium carbonate and titanium dioxide. Then, the SrTiO₃ matrix and CeO₂ were combined in following system:SrTiO_3+x（CeO₂.TiO₂）, where x is Weight percent. The samples were fired at 1400℃ and 1430℃ for an hour. The Ce element inSrTiO₃ ceramics is as an impurity donor; and the added amounts of CeO₂ vary from 2wt% to 40wt％.The Ce elements can increase the permittirity and ε’ of SrTiO₃ based ceramics, and improve the temperature and frequency characteristics of ε’. The electron microscopic analysis and X-ray exmination indicate that there is a second phase （Viz. glass phase） of Ce₂O₃ in the SrTiO₃ ceramics containing CeO₂ and it has the solid solubility in the impurity like Mg²⁺ etc. The seconds phase can decreases the semiconductivity of SrTiO₃ ceramics, weakens the oxidation of the surface of grains increases the conductivity of grains.更多还原