Microwave Dielectric Properties of A-Site Modified Ba(Co0.7Zn0.3)1/3Nb2/3O3 by La3

• Published in: Journal of the American Ceramic Society Vol. 91; no. 4; pp. 1182 - 1187
• Main Authors: Bian, Jian Jiang, Dong, Yun Fei, Song, Guo Xiang
• Format: Journal Article
• Language: English
• Published: Malden, USA Blackwell Publishing Inc 01.04.2008
• Subjects: Ceramics; Dielectric constant; Dielectric properties; Diffraction; Microwaves; Sinterability; Sintering; X-rays
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2008.02292.x

The sintering behavior, ordering state, and microwave dielectric properties of Ba1−xLa2x/3(Zn0.3Co0.7)1/3Nb2/3O3 Ceramics (0≤x≤0.06) were investigated in this paper. The X‐ray diffraction (XRD) results show that all samples exhibit a single perovskite phase except for the sample with x≥0.03. The sinterability is slightly improved by La doping. The long range order (LRO) degree on B‐site is greatly increased with the increase of x value up to x=0.015 and then slightly decreased with the further increase of x due to the increasing amount of second phases. The dielectric constant at microwave frequency decreases slightly with the increase of x when x<0.015 and increases slightly with further increasing x for the samples sintered at 1375°C/10 h. The Q×f value increases with x up to x=0.015 and then decreases with further increase of x, which is consistent with the variation trend of LRO degree. The τf value decreases slightly with the increase of x up to 0.006, then increases greatly with the further increase of x. An optimized dielectric properties of ɛr=34, Q×f=63 159, GHz and τf=5.21 ppm/°C were obtained for the x=0.01 sample sintered at 1425°C/10 h.