Journal Article

PUBDB-2023-01710

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Structure and relaxor ferroelectric behavior of the novel tungsten bronze type ceramic Sr$_5$BiTi$_3$Nb$_7$O$_{30}$

He, Q. ; Schmid, S. (Corresponding author) ; Chen, X. ; Peng, B. ; Li, C. ; Hu, C. ; Liu, L. (Corresponding author) ; Hinterstein, M.Extern*

2022
American Inst. of Physics Melville, NY

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Please use a persistent id in citations: doi:10.1063/5.0084417  doi:10.3204/PUBDB-2023-01710

Abstract: This paper reports a novel lead-free tungsten bronze type ceramic, Sr$_5$BiTi$_3$Nb$_7$O$_{30}$, prepared by a conventional high-temperature solid-state reaction route. The crystal structure identified using synchrotron x-ray diffraction data and Raman spectroscopy for Sr$_5$BiTi$_3$Nb$_7$O$_{30}$ could be described as an average structure with the centrosymmetric space group P4/mbm and a local non-centrosymmetric structure at room temperature. In the second-harmonic generation measurement, the Sr$_5$BiTi$_3$Nb$_7$O$_{30}$ compound exhibits second-order nonlinear optical behavior, which suggests the material is ferroelectric. Temperature dependence of the dielectric permittivity indicates that the dielectric anomaly in Sr$_5$BiTi$_3$Nb$_7$O$_{30}$, associated with the disorder on the A and B sites, results in strong frequency dispersion with a low phase-transition temperature. A macroscopic and phenomenological statistical model was employed to describe the temperature dependence of the dielectric responses of Sr$_5$BiTi$_3$Nb$_7$O$_{30}$ and Sr$_6$Ti$_2$Nb$_8$O$_{30}$. The calculated sizes of polar nanoregions for both compounds imply structural disorder induced by A and B sites, giving rise to a more diffuse ferroelectric transition for Sr$_5$BiTi$_3$Nb$_7$O$_{30}$. The smaller polar nanoregions with smaller electrical dipole moments can be activated at lower temperatures, leading to Sr$_5$BiTi$_3$Nb$_7$O$_{30}$ having a lower Tm (∼260 K) than other tungsten bronze type ferroelectrics. This work charts a promising feasible route to the development of improved relaxor ferroelectrics in tungsten bronze type oxides.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20191018 (I-20191018) (I-20191018)

Experiment(s):

1. PETRA Beamline P02.1 (PETRA III)

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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