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Average vs. local structure and composition-property phase diagram of K 0.5 Na 0.5 NbO 3 -Bi ½ Na ½ TiO 3 system

Liu, Laijun and Knapp, Michael and Ehrenberg, Helmut and Fang, Liang and Fan, Huiqing and Schmitt, Ljubomira Ana and Fuess, Hartmut and Hoelzel, Markus and Dammak, Hichem and Thi, Mai Pham and Hinterstein, Manuel (2017):
Average vs. local structure and composition-property phase diagram of K 0.5 Na 0.5 NbO 3 -Bi ½ Na ½ TiO 3 system.
In: Journal of the European Ceramic Society, Elsevier Science Publishing, pp. 1387-1399, 37, (4), ISSN 09552219, DOI: 10.1016/j.jeurceramsoc.2016.11.024, [Online-Edition: https://doi.org/10.1016/j.jeurceramsoc.2016.11.024],
[Article]

Abstract

Phase diagram of the solid solution system K0.5Na0.5NbO3- Bi½Na½TiO3 [(1-x)KNN-xBNT] has been established from dielectric permittivity measurement and structure analyses. The unit cell volumes continuously decrease depending on the composition, while the local structure maintains distortions away from the cubic average structure in the range 0.10 ≤ x ≤ 0.90. No clear correspondence for the temperatures of phase transition exists between structural studies and physical properties. The dielectric behavior is depicted successively from normal ferroelectric, diffuse phase transition, re-entrant-like relaxor, relaxor + dipolar glass-like relaxor, BNT-like relaxor with the increase of BNT. A comprehensive composition-property phase diagram for this system has been given to understand the various ferroelectric phenomena. The result could be mainly elucidated by the nanoclusters and the disorder driven nucleation of polar nanoregions contributed by a valence mismatch at one of the cation sites.

Item Type: Article
Erschienen: 2017
Creators: Liu, Laijun and Knapp, Michael and Ehrenberg, Helmut and Fang, Liang and Fan, Huiqing and Schmitt, Ljubomira Ana and Fuess, Hartmut and Hoelzel, Markus and Dammak, Hichem and Thi, Mai Pham and Hinterstein, Manuel
Title: Average vs. local structure and composition-property phase diagram of K 0.5 Na 0.5 NbO 3 -Bi ½ Na ½ TiO 3 system
Language: English
Abstract:

Phase diagram of the solid solution system K0.5Na0.5NbO3- Bi½Na½TiO3 [(1-x)KNN-xBNT] has been established from dielectric permittivity measurement and structure analyses. The unit cell volumes continuously decrease depending on the composition, while the local structure maintains distortions away from the cubic average structure in the range 0.10 ≤ x ≤ 0.90. No clear correspondence for the temperatures of phase transition exists between structural studies and physical properties. The dielectric behavior is depicted successively from normal ferroelectric, diffuse phase transition, re-entrant-like relaxor, relaxor + dipolar glass-like relaxor, BNT-like relaxor with the increase of BNT. A comprehensive composition-property phase diagram for this system has been given to understand the various ferroelectric phenomena. The result could be mainly elucidated by the nanoclusters and the disorder driven nucleation of polar nanoregions contributed by a valence mismatch at one of the cation sites.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 37
Number: 4
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Structure, Dielectric Relaxation, Phase diagram, Lead-free ceramics
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 27 Dec 2017 12:04
DOI: 10.1016/j.jeurceramsoc.2016.11.024
Official URL: https://doi.org/10.1016/j.jeurceramsoc.2016.11.024
Funders: We acknowledge the support from the fellowship of the Helmholtz Institute and the Karlsruhe Institute of Technology., This work has benefitted from beamtime allocation at P02.1 at PETRA III in Hamburg (Germany) and SPODI at FRM II (Garching) Germany., Financial support from the ‘Bundesministerium für Bildung und Forschung (BMBF)’ under grant number 05K13VK1 is acknowledged., Financial Support from the Australian Research Council (ARC) under grant number DE150100750 and SFB 595 is acknowledged., Financial support from the Natural Science Foundation of China (Nos. 11264010, 51002036, 11564010) and the Natural Science Foundation of Guangxi (Grant No. GA139008) is also acknowledged.
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