New temperature stable and low loss materials of (Nd0.97Mn0.045)(1.02)Nb0.988O4 ceramics by La3+ substitution

作者：Zhang, Ping^*; Zhao, Yonggui; Wu, Haitao; Wang, Xiuyu

来源：Journal of Alloys and Compounds, 2015, 650: 547-552.

DOI：10.1016/j.jallcom.2015.08.023

• Microwave dielectric properties
• Bond ionicity
• Lattice energy
• Bond energy
• Ceramics

(Nd0.97Mn0.045)(1.02)Nb0.988O4 ceramics based on La3+ substitution were prepared via a conventional solid estate reaction method. The effects of La3+ substitution for Nd3+ on microwave dielectric properties of the (Nd0.97Mn0.045)(1.02)Nb0.988O4 ceramics were investigated. The X-ray patterns showed that the specimens presented single NdNbO4 phase with the monoclinic fergusonite structure in the range of x = 0.0 -0.05, with a further increase of the amount of substitution ions, LaNb7O19 phase appeared in this system. For the main phase, the increase of dielectric constant could be attributed to the increase in the Nd-site bond ionicity. The Q x f value and tau(f) value were correlated to lattice energy and bond energy, respectively. Moreover, at 1250 degrees C, the ((Nd0.97Mn0.045)(1-x)La-x)(1.02)Nb0.988O4 ceramics with x = 0.05 possessed excellent microwave dielectric properties: epsilon(r) = 21.93, Q x f = 66 700 GHz and tau(f) = -1.08 ppm/degrees C.

• 出版日期2015-11-25
• 单位天津大学; 济南大学