The Effect of Y3+ Doping on CaTiO3-LaAlO3 Microwave Dielectric Ceramics. (November 2019)

• Record Type: Journal Article
• Authors: Luo, Jieyu; Li, Yueming; Li, Zhike; Shen, Zongyang; Wang, Zhumei; Pu, Qinheng
• Is Part Of: IOP conference series. Volume 678(2019)
• Publication Date: 2019-11
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/678/1/012130
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: CaTiO3 -LaAlO3 solid solution with perovskite structure has suitable relative permittivity ( εr ) and high quality factor ( Q×f ) for application as dielectric resonators, but the negative value of the temperature coefficient of resonance frequency ( τf ) affects its utilization. To improve dielectric properties and adjust lattice matching, Y 3+ ion was selected as doping element to prepare the 0.65CaTiO3 -0.35(La1- x Y x )AlO3 ( x =0, 0.02, 0.04, 0.06, 0.08 ) microwave dielectric ceramics by conventional mixed solid method. The effects of Y 3+ ion doping on the crystal structure and microwave dielectric properties were investigated. The results revealed that a single orthorhombic phase for all the compositions can form and the unit cell volume increases linearly with the doping content x . Y 3+ ion dopant can increase the quality factor and improve the temperature coefficient of resonant frequency of 0.65CaTiO3- 0.35LaAlO3 ceramics. When x = 0.02, the optimal microwave dielectric properties of εr =45.8, Q×f = 38957 GHz, and τf = 4×10 −6/o C for the 0.65CaTiO3 -0.35(La1- x Y x )AlO3 ceramics could be obtained, which sintered at 1500 °C for 5 h.