Effects of Bi substitution on the structures, electrical properties, and transparency of Sr2Na1−3Bi Nb5O15 ceramics

Xu, Shengxin; Yang, Peng; Deng, Zhuo; Wei, Lingling; Yang, Zupei

doi:10.1016/j.materresbull.2020.110774

Cited by 8 publications

(4 citation statements)

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“…It is known that nonequiaxed grains are common in TTB compounds because of the greater adhesion energy along the c axis, which leads to epitaxial growth more easily than along other directions. 28 With the increase of x, the mean size decreases from 4.52 μm at x = 0.0 to 2.73 μm at x = 1.0. This is related to the strong refractory character of Ta-containing materials.…”

Section: Resultsmentioning

confidence: 91%

“…The morphology of all ceramics shows the coexistence of nonequiaxed and equiaxed grains. It is known that nonequiaxed grains are common in TTB compounds because of the greater adhesion energy along the c axis, which leads to epitaxial growth more easily than along other directions . With the increase of x , the mean size decreases from 4.52 μm at x = 0.0 to 2.73 μm at x = 1.0.…”

Section: Results and Discussionmentioning

confidence: 99%

“…25,27 In order to reduce the impurity phase caused by exceeding the solution limit of SrNb 2 O 6 and NaNbO 3 in SNN-based systems, the A-site vacancy is employed to reduce the filling degree of A-sites and cause the structural deviation from the filled type. 28 Then, substituting high-valence Bi 3+ for low-valence Na + in A sites can help to reduce the structural filling degree and eliminate the impurity phase. Moreover, Bi 2 O 3 as a sintering assistant can optimize the sintering behavior and improve density.…”

Section: Introductionmentioning

confidence: 99%

“…As a typically filled TTB structure, Sr 2 NaNb 5 O 15 (SNN)-based ceramics are the main basic system for the study of ferroelectric and ESPs. However, the impurity phase Na 0.5 Sr 0.25 NbO 3 is easy to appear in Sr 2 NaNb 5 O 15 ceramics, which could deteriorate performances. , In order to reduce the impurity phase caused by exceeding the solution limit of SrNb 2 O 6 and NaNbO 3 in SNN-based systems, the A-site vacancy is employed to reduce the filling degree of A-sites and cause the structural deviation from the filled type . Then, substituting high-valence Bi 3+ for low-valence Na + in A sites can help to reduce the structural filling degree and eliminate the impurity phase.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Energy Storage Performance in Lead-Free Bismuth Sodium Niobate-Based Tungsten Bronze Ceramics through Relaxor Tuning

Shen

Huang

et al. 2023

ACS Appl. Mater. Interfaces

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A series of tungsten bronze Sr2Na0.85Bi0.05Nb5–x Ta x O15 (SBNN-xTa) ferroelectric ceramics were designed and synthesized by the traditional solid-phase reaction method. The B-site engineering strategy was utilized to induce structural distortion, order–disorder distribution, and polarization modulation to enhance relaxor behavior. Through investigating the impact of B-site Ta replacement on the structure, relaxor behavior, and energy storage performance, this study has shed light on the two main factors for relaxor nature: (1) with the increase of Ta substitution, the tungsten bronze crystal distortion and expansion induced the structural change from an orthorhombic Im2a phase to Bbm2 phase at room temperature; (2) the transition from ferroelectric to relaxor behavior could be attributed to the coordinate incommensurate local superstructural modulations and the generation of nanodomain structure regions. Moreover, we benefited from the effective decrease of ceramic grains and inhibition of abnormal growth. Finally, we obtained an effective energy storage density (W rec) ∼ 1.6 J/cm3, an efficiency (η) ∼ 80%, a current density (C D) ∼ 1384.2 A/cm2, and a power density (P D) ∼ 138.4 MW/cm3.

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Section: Resultsmentioning

confidence: 91%

Section: Results and Discussionmentioning

confidence: 99%