Accelerating B‐site cation ordering‐disordering transition and improving dielectric properties of Ba(Co,Zn) 1/3 Nb 2/3 O 3 complex perovskite microwave ceramics by CuO doping

• Published in: Journal of the American Ceramic Society 2024-09, Vol.107 (9), p.6152-6163
• Main Authors: Li, Hao, Liu, Fei, Chang, Kuan‐Chang, Lin, Xinnan, Liu, Shaojun
• Format: Article
• Language: English
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/jace.19873

The B‐site cation ordering‐disordering transition process of complex perovskite Ba(B′ 1/3 B″ 2/3 )O 3 ‐based microwave ceramics can be directly promoted by accelerating the mass transport process rather than depending on long‐time annealing treatment. Clear evidences suggest that CuO doping is helpful in enhancing the densification process of Ba(Co 0.7 Zn 0.3 ) 1/3 Nb 2/3 O 3 (BCZN) ceramics and promoting the growth and coarsening of the ordering domain, facilitated by the formation of quasi‐liquid CuO‐xCu 2 O layers. The improvement of the 1:2 ordering degree is attributed to the accelerated mass transport process enabled by quasi‐liquid CuO‐xCu 2 O layers rather than long‐time annealing treatment. Consequently, the Q×f values experience a significant increase from 21,200 to 69,300 GHz, owing to enhancements in the relative density and 1:2 ordering degree. CuO‐doped BCZN ceramics achieve high 1:2 ordering degree and Q×f values at relatively low temperatures and for short periods of time, and more importantly, it circumvents conventional lengthy annealing processes (>30 h) effectively to promote its ordering transition. These findings underscore the potential of accelerating mass transport process to promote ordering‐disordering phase transitions and improving dielectric properties of complex perovskite Ba(B′ 1/3 B″ 2/3 )O 3 ‐based microwave ceramics.