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

“…The structure with only 5 out of 6 A-sites occupied represents 'unfilled' structure [5]. It is found that the ionoccupying-situation and disorder-degree in A-sites, which are greatly dependent on the size and electronegativity of substituted ions, can significantly affect the distortion of NbO6 octahedron polar unit, resulting in some characteristic dielectric and ferroelectric behaviors in TB materials [6][7][8][9][10].…”

Enhanced electrical properties and strong red light‐emitting in Eu3+‐doped Sr1.90Ca0.15Na0.9Nb5O15 ceramics

“…1-3 TB niobate oxides with general formula of (A1) 4 (A2) 2 (C) 4 Nb 10 O 30 are based on ab-planar array of corner-shared NbO 6 octahedrons that are stacked along the c-axis to form different tunnels with pentagonal (A1), quadrangular (A2), and triangular (C) cross-sections in the crystal lattice. [5][6][7][8][9][10][11] In addition, niobate materials with the 'filled' TB structure usually exhibit much better dielectric and ferroelectric properties compared to those with the 'unfilled' TB structure. 4 It is reported that the distortion of NbO 6 octahedral polar unit can be greatly affected by the ion-occupying-situation, ionic size, and electronegativity of substituted ions, resulting in some special dielectric and ferroelectric behaviors in TB niobate materials.…”

“…The complete occupation of all above A1, A2, and C sites corresponds to the 'stuffed' TB structure; C site is generally vacant, then the occupation of 6 A sites refers to the 'filled' TB structure; the occupation with only 5 out of 6 A sites refers to the 'unfilled' structure. 5,8,12 In the past decades, luminescent-ferroelectic materials have aroused considerable attention as that they can be developed for future multifunctional optoelectronic devices within a single material. [5][6][7][8][9][10][11] In addition, niobate materials with the 'filled' TB structure usually exhibit much better dielectric and ferroelectric properties compared to those with the 'unfilled' TB structure.…”

“…4 It is reported that the distortion of NbO 6 octahedral polar unit can be greatly affected by the ion-occupying-situation, ionic size, and electronegativity of substituted ions, resulting in some special dielectric and ferroelectric behaviors in TB niobate materials. [5][6][7][8][9][10][11] In addition, niobate materials with the 'filled' TB structure usually exhibit much better dielectric and ferroelectric properties compared to those with the 'unfilled' TB structure. 5,8,12 In the past decades, luminescent-ferroelectic materials have aroused considerable attention as that they can be developed for future multifunctional optoelectronic devices within a single material.…”

“…[5][6][7][8][9][10][11] In addition, niobate materials with the 'filled' TB structure usually exhibit much better dielectric and ferroelectric properties compared to those with the 'unfilled' TB structure. 5,8,12 In the past decades, luminescent-ferroelectic materials have aroused considerable attention as that they can be developed for future multifunctional optoelectronic devices within a single material. 13,14 Luminescent-ferroelectric performs can be obtained in ferroelectric host materials doped with activator ions.…”