Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 33, Issue 11, Pages 2141-2153Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2013.03.020
Keywords
Bismuth sodium titanate; Relaxor ferroelectrics; TEM; Crystal symmetry; Microstructure
Categories
Funding
- National Science Council (NSC) of Taiwan, ROC [NSC97-2221-E-110-012-MY3, NSC100-2628-E-002-024-MY2]
- Office of Research and Development of National Taiwan University [101R7718]
Ask authors/readers for more resources
This study investigates the microstructure, elemental distribution, diffuse phase transition (DPT) and crystalline phases of BNBK 85.4/2.6/12 lead-free ferroelectric ceramics, a high-strain bismuth sodium titanate-based relaxor system with complex A-site compositions. TEM electron diffraction studies indicate that the ceramics are close to a compositionally driven morphotropic phase boundary between a conventional rhombohedral (R) structure and a nanoscale tetragonal (7) structure. The ceramics exhibit a core shell grain microstructure the shell region shows a cubic average symmetry with the presence of tetragonal distortions; while the core region is of a mixture of T and R phases. Analysis of the corresponding superlattice reflections and dark-field images reveals an R phase-dominant core with the presence of R-twin domains. The high resolution TEM image of the shell region, reveals the existence of T-phase nano-domains. The DPT behavior is mainly attributed to the heterogeneous distribution of cations of high valences and concentrations across the core shell grains. (C) 2013 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available