Role of structural modulation in electrical properties of tungsten bronze (Ca0.28Ba0.72)2.5−0.5Na Nb5O15 ceramics

Yang, Bian; Wei, Lingling; Chao, Xiaolian; Wang, Zhongming; Yang, Zupei

doi:10.1016/j.jallcom.2015.01.247

Cited by 34 publications

(10 citation statements)

References 30 publications

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“…with increase of frequency is also observed in other TTB compounds, such as (Ca 0.28 Ba 0.72 ) 2.5-0.5x Na x Nb 5 O 15[22] and Li 2 Pb 2 Pr 2 W 2 Ti 4 Ta 4 O 30…”

supporting

confidence: 62%

“…The dielectric constant ε r and dielectric loss tanδ of CBKN ceramics measured around room temperature at 10 kHz as a function of x are presented in Figure 5 [26]. This type of dielectric behavior is not usually intrinsic but is rather associated with the presence of space charges in ceramics, and then is ascribed to extrinsic behavior [22]. For the compositions with x = 0.5 and 0.6, the evaporation of K element becomes easier during higher temperature sintering procedure, leading to the presence of space charges associated with oxygen vacancies (OVs).…”

Section: Resultsmentioning

confidence: 98%

“…Afterwards, introducing alkali Na + ions (1.39 Å) with similar radius of Ca 2+ ions in CBN28 to decrease the structural vacancies has resulted in the enhancement of dielectric and ferroelectric properties. It has been suggested that the electric behavior in these materials can be modulated by the ions-occupying-situation and also the ionic-radius-difference in A sites [22]. To further understanding the correlation of the composition-structure-property in TTB compounds, the bigger alkali K + ions (1.64 Å) can be utilized in the design of new materials.…”

Section: Introductionmentioning

confidence: 99%

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Structural modulation and electrical properties in ferroelectric niobates (Ca0.28Ba0.72)2.5−0.5K Nb5O15 (0.0≤x≤0.6) ceramics

Yang

Wei

et al. 2015

Ceramics International

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“…with increase of frequency is also observed in other TTB compounds, such as (Ca 0.28 Ba 0.72 ) 2.5-0.5x Na x Nb 5 O 15[22] and Li 2 Pb 2 Pr 2 W 2 Ti 4 Ta 4 O 30…”

supporting

confidence: 62%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structural modulation and electrical properties in ferroelectric niobates (Ca0.28Ba0.72)2.5−0.5K Nb5O15 (0.0≤x≤0.6) ceramics

Yang

Wei

et al. 2015

Ceramics International

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“…Li2Pb2Pr2W2Ti4Ta4O30 [33]. This type of dielectric behavior is not usually intrinsic but is rather associated with the presence of space charges in ceramics, and then is ascribed to extrinsic behavior [31].…”

Section: Resultsmentioning

confidence: 99%

Variation of electrical properties with structural vacancies in ferroelectric niobates (Sr0.53Ba0.47)2.5−0.5Na Nb5O15 ceramics

Yang

Hao

et al. 2016

Journal of Alloys and Compounds

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(Sr0.53Ba0.47)2.5-0.5xNaxNb5O15 ceramics (SBNN, 0.0 ≤ x ≤ 2.5) were prepared by the conventional solid-state reaction method. The Na + concentration varied from 0.0 to 2.5 so that the tetragonal tungsten bronze (TTB) crystal structure was designed to transform from 'unfilled' to 'filled' and then to 'stuffed' type. Apart from the change in the structural type, the effects of Na + concentration on the phase structure as well as microstructure, ferroelectric and dielectric properties were also investigated. X-ray diffraction analysis revealed that the crystallized SBNN ceramics with x ≤ 1.0 had the tetragonal tungsten bronze structure with space group of P4bm. With further increasing x above 1.0, the broad asymmetrical diffraction peaks near 32 o associated with EDX analyses indicated the existence of some amount of secondary NaNbO3based phase due to the introduction of excessive Na +. It was also found that Na + concentration had a significant influence on the electrical properties of SBNN ceramics. Introducing Na + in A-sites to decrease the structural vacancies and increase the distortion degree of NbO6 polar unit was beneficial for the electric properties, while excessive Na + content would deteriorate the electric properties owing to the presence of secondary NaNbO3-based phase.

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“…Because the grain growth in (001) facet of tungsten bronze structure is faster due to the lower surface energy. 35…”

Section: Characterizationmentioning

confidence: 99%

Large activation energy in aged Mn-doped Sr_0.4Ba_0.6Nb₂O₆ ferroelectric ceramics

et al. 2017

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Role of structural modulation in electrical properties of tungsten bronze (Ca0.28Ba0.72)2.5−0.5Na Nb5O15 ceramics

Cited by 34 publications

References 30 publications

Structural modulation and electrical properties in ferroelectric niobates (Ca0.28Ba0.72)2.5−0.5K Nb5O15 (0.0≤x≤0.6) ceramics

Structural modulation and electrical properties in ferroelectric niobates (Ca0.28Ba0.72)2.5−0.5K Nb5O15 (0.0≤x≤0.6) ceramics

Variation of electrical properties with structural vacancies in ferroelectric niobates (Sr0.53Ba0.47)2.5−0.5Na Nb5O15 ceramics

Large activation energy in aged Mn-doped Sr_0.4Ba_0.6Nb₂O₆ ferroelectric ceramics

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Role of structural modulation in electrical properties of tungsten bronze (Ca0.28Ba0.72)2.5−0.5Na Nb5O15 ceramics

Cited by 34 publications

References 30 publications

Structural modulation and electrical properties in ferroelectric niobates (Ca0.28Ba0.72)2.5−0.5K Nb5O15 (0.0≤x≤0.6) ceramics

Structural modulation and electrical properties in ferroelectric niobates (Ca0.28Ba0.72)2.5−0.5K Nb5O15 (0.0≤x≤0.6) ceramics

Variation of electrical properties with structural vacancies in ferroelectric niobates (Sr0.53Ba0.47)2.5−0.5Na Nb5O15 ceramics

Large activation energy in aged Mn-doped Sr0.4Ba0.6Nb2O6 ferroelectric ceramics

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Large activation energy in aged Mn-doped Sr_0.4Ba_0.6Nb₂O₆ ferroelectric ceramics