Determination of chemical ordering in the complex perovskite Pb(Cd.sub.1/3./sub.Nb.sub.2/3./sub.)O.sub.3./sub.

0498090 - FZÚ 2019 RIV GB eng J - Journal Article
Wang, C. - Fu, Z. - Zhang, N. - Pasciak, Marek - Zhuang, J. - Liu, Z. - Ren, W. - Ye, Z. -G.
Determination of chemical ordering in the complex perovskite Pb(Cd_1/3Nb_2/3)O₃.
IUCrJ. Roč. 5, č. 6 (2018), s. 808-815. ISSN 2052-2525. E-ISSN 2052-2525
R&D Projects: GA ČR GA15-04121S
Institutional support: RVO:68378271
Keywords : chemical ordering * diffuse scattering * electron microscopy * atomic resolution EDS * perovskites * dielectric permittivity * relaxors
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4.756, year: 2018

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.

Permanent Link: http://hdl.handle.net/11104/0290507