New eight-layer twinned hexagonal perovskite microwave dielectric   ceramic Ba8NiNb6O24

doi:10.1111/jace.14601

CORC > 北京大学 > 化学与分子工程学院

	New eight-layer twinned hexagonal perovskite microwave dielectric ceramic Ba8NiNb6O24
	Tao, Fengqiong ; Wang, Xiaoming ; Gong, Mielu ; Lu, Fengqi ; Allix, Mathieu ; Kuang, Xiaojun ; Fang, Liang
刊名	JOURNAL OF THE AMERICAN CERAMIC SOCIETY
	2017
关键词	cation ordering eight-layer hexagonal perovskite microwave dielectric property twin-shift option CRYSTAL-STRUCTURE ZN BA8ZNTA6O24 SYSTEM SERIES MG
DOI	10.1111/jace.14601
英文摘要	A new eight-layer hexagonal perovskite Ba8NiNb6O24 was synthesized via the high-temperature solid-state reaction and its structure was characterized using selected area electron diffraction, high-resolution transmission electron microscopy, and synchrotron X-ray diffraction. Unlike the eight-layer ordered shifted Ba8CoNb6O24 and Ba8ZnNb6O24, Ba8NiNb6O24 adopts a twinned structure with stacking sequence (ccch)(2) for the BaO3 layers and displays more disordered cation and vacancies over the face-sharing octahedral (FSO) sites than the twinned tantalates Ba8MTa6O24 (M=Zn, Ni, Co). The stabilization of twinned structure and cation/vacancy ordering in Ba8NiNb6O24 composition is correlated with the smaller size difference between Ni2+ and Nb5+ in comparison with those between (Zn/Co)(2+) and Nb5+ in the shifted Ba8CoNb6O24 and Ba8ZnNb6O24. The Ba8NiNb6O24 pellet exhibits high dielectric permittivity epsilon(r)similar to 40, modest Qf similar to 41319GHz, and large temperature coefficient of resonant frequency (f)similar to 60ppm/degrees C. The lower Qf value compared with the high-Q Ba8MTa6O24 is ascribed to the reduced short-range B-cationic ordering inside the FSO dimers in Ba8NiNb6O24. These results contribute to understanding the interplay among chemical composition, structure, and dielectric properties of the eight-layer twinned and shifted hexagonal perovskites.; U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]; SCI(E); ARTICLE; 3; 1212-1220; 100
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/474737]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Tao, Fengqiong,Wang, Xiaoming,Gong, Mielu,et al. New eight-layer twinned hexagonal perovskite microwave dielectric ceramic Ba8NiNb6O24[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2017.
APA	Tao, Fengqiong.,Wang, Xiaoming.,Gong, Mielu.,Lu, Fengqi.,Allix, Mathieu.,...&Fang, Liang.(2017).New eight-layer twinned hexagonal perovskite microwave dielectric ceramic Ba8NiNb6O24.JOURNAL OF THE AMERICAN CERAMIC SOCIETY.
MLA	Tao, Fengqiong,et al."New eight-layer twinned hexagonal perovskite microwave dielectric ceramic Ba8NiNb6O24".JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2017).