Ordered Domains and Microwave Properties of Sub-micron Structured Ba(Zn1/3Ta2/3)O3 Ceramics Obtained by Spark Plasma Sintering

Materials

Hao Li¹  Shaojun Liu²  Fei Liu²  Xuejiao Cui³  Weidong Rao³  Jie Wang³  Lijin Cheng⁴ 

[1] Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;Shenzhen Research Institute, Central South University, Shenzhen 518057, China;State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;;State Key Laboratory of Materials Processing and Die &

关键词: B-site ordering;    microwave ceramics;    spark plasma sintering;    domains;    sub-micron sized grains;    quality factor;   

DOI  :  10.3390/ma12040638

来源: DOAJ

【 摘 要 】

The degree of Zn²⁺ and Ta⁵⁺ ions ordering could play an important role in the dielectric loss in Ba(Zn_1/3Ta_2/3)O₃ (BZT) ceramics. However, the influence of the grain size of Ba(B′_1/3B″_2/3)O₃ ceramics with nano or sub-micron grains on the ordering domains structure is still not clear. In the present paper, highly dense (~98%) BZT microwave dielectric ceramics with homogeneous sub-micron structure (~330 nm) were prepared through spark plasma sintering (SPS). High resolution transmission electron microscopy combined with X-ray diffraction (XRD)clearly showed that the B-site ordering structure of sintered BZT samples by SPS becomes the B-site long-range 1:2 ordering as annealing proceeds. In contrast, the short-range 1:2 ordering in non-annealed counterparts was also present, which was not detectable by XRD. The size of B-site ordering domains enlarged with annealing temperature. The sub-micron structure of sintered BZT ceramics by SPS remained stable at up to 1400 C; however, the size of B-site 1:2 ordering domain was more than five times larger, which led to a significant increase of the quality factor (Q·f) to 37,700 GHz from 15,000 GHz.

【 授权许可】

Unknown