Determination of chemical ordering in the complex perovskite Pb(Cd1/3Nb2/3)O3

IUCrJ

Fu, Z.¹  Wang, C.²  Zhang, N.³ 

[1]Analysis and Testing Center for Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China

[2]Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China

[3]Institute of Physics, The Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 182 21, Czech Republic

关键词: CHEMICAL ORDERING;    DIFFUSE SCATTERING;    ELECTRON MICROSCOPY;    ATOMIC RESOLUTION EDS;    PEROVSKITES;    DIELECTRIC PERMITTIVITY;    RELAXORS;   

DOI  :  10.1107/S2052252518013805

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

Pure-phase Pb(Cd1/3Nb2/3)O3 (PCN) single crystals and ceramics with a complex perovskite structure are synthesized for the first time. The local chemical ordering in PCN has been investigated by X-ray diffraction (including diffuse scattering) and Cs-corrected transmission electron microscopy experiments. It is concluded that the PCN samples have large coherent chemical ordering regions that even extend to the long range, and the ordering model is consistent with β-type chemical ordered regions. The antiphase domain boundaries were also observed. Two dielectric anomaly peaks were found in these two types of samples, one of which indicates possible relaxor behaviour. The novel structure of the completely ordered regions and its relationship with the electrical properties make PCN a unique material for the fundamental understanding of chemically substituted perovskites.

【 授权许可】

CC BY