Enhanced dielectric and ferroelectric responses in La3+/Ti4+ co-substituted SrBi2Ta2O9 Aurivillius phase

Zulhadjri, Zulhadjri; Wendari, Tio Putra; Ikhram, Mukhniyal; Putri, Yulia Eka; Septiani, Upita; Imelda, _

doi:10.1016/j.ceramint.2022.01.307

Cited by 15 publications

(6 citation statements)

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“…This is likely due to the incorporation of smaller cations, Ti 4+ ( r = 0.61 Å) and La 3+ ( r = 1.36 Å), into the structure compared to Ta 5+ ( r = 0.64 Å)/Nb 5+ ( r = 0.64 Å) and Sr 2+ ( r = 1.44 Å)/Ba 2+ ( r = 1.61 Å). 59 , 60 The refinement data of Nakada et al show that also the partial substitution of Ta 5+ /Nb 5+ with Ti 4+ and Sr 2+ /Ba 2+ with Bi 3+ ( r = 1.17 Å) already results in a reduction of the cell volume, however, less pronounced than in this work. 20 …”

Section: Resultscontrasting

confidence: 44%

“…Comparing the cell parameters of [LaTi 2 O 7 ][Bi 1.45 La 0.55 O 2 ] 2 Cl with cell parameters found in the literature for n = 2 Sillén–Aurivillius-type materials, e.g., Sr 2 Bi 3 Nb 2 O 11 Cl or Ba 2 Bi 3 Ta 2 O 11 Cl which are isostructural, it becomes evident that the cell parameters are significantly smaller (Table ). This is likely due to the incorporation of smaller cations, Ti 4+ ( r = 0.61 Å) and La 3+ ( r = 1.36 Å), into the structure compared to Ta 5+ ( r = 0.64 Å)/Nb 5+ ( r = 0.64 Å) and Sr 2+ ( r = 1.44 Å)/Ba 2+ ( r = 1.61 Å). , The refinement data of Nakada et al show that also the partial substitution of Ta 5+ /Nb 5+ with Ti 4+ and Sr 2+ /Ba 2+ with Bi 3+ ( r = 1.17 Å) already results in a reduction of the cell volume, however, less pronounced than in this work …”

Section: Resultsmentioning

confidence: 99%

“…The side facets belong to the {100} family as schematically depicted in Figure c. The anisotropic plate-like growth is a prominent feature of the Aurivillius and Sillén phases. , Flux methods allow powder particles to grow into their thermodynamic equilibrium shape (or close to it), the plate-like shape with a short axis in the [001] direction being indicative of a low surface energy of the (001) facets …”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Structure of the Double-Layered Sillén–Aurivillius Perovskite Oxychloride La_2.1Bi_2.9Ti₂O₁₁Cl as a Potential Photocatalyst for Stable Visible Light Solar Water Splitting

et al. 2023

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Exploring photocatalysts for solar water splitting is a relevant step toward sustainable hydrogen production. Silleń−Aurivillius-type compounds have proven to be a promising material class for photocatalytic and photoelectrochemical water splitting with the advantage of visible light activity coupled to enhanced stability because of their unique electronic structure. Especially, double-and multilayered Silleń−Aurivillius compoundswith A and B being cations and X a halogen anion, offer a great variety in material composition and properties. Yet, research in this field is limited to only a few compounds, all of them containing mainly Ta 5+ or Nb 5+ as cations. This work takes advantage of the outstanding properties of Ti 4+ demonstrated in the context of photocatalytic water splitting. A fully titanium-based oxychloride, La 2.1 Bi 2.9 Ti 2 O 11 Cl, with a double-layered Silleń− Aurivillius intergrowth structure is fabricated via a facile one-step solid-state synthesis. A detailed crystal structure analysis is performed via powder X-ray diffraction and correlated to density functional theory calculations, providing a detailed understanding of the site occupancies in the unit cell. The chemical composition and the morphology are studied using scanning and transmission electron microscopy together with energy-dispersive X-ray analysis. The capability of the compound to absorb visible light is demonstrated by UV−vis spectroscopy and analyzed by electronic structure calculations. The activity toward the hydrogen and the oxygen evolution reaction is evaluated by measuring anodic and cathodic photocurrent densities, oxygen evolution rates, and incident-current-to-photon efficiencies. Thanks to the incorporation of Ti 4+ , this Silleń−Aurivillius-type compound enables best-inclass photoelectrochemical water splitting performance at the oxygen evolution side under visible light irradiation. Thus, this work highlights the potential of Ti-containing Silleń−Aurivillius-type compounds as stable photocatalysts for visible light-driven solar water splitting.

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Section: Resultscontrasting

confidence: 44%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Synthesis and Structure of the Double-Layered Sillén–Aurivillius Perovskite Oxychloride La_2.1Bi_2.9Ti₂O₁₁Cl as a Potential Photocatalyst for Stable Visible Light Solar Water Splitting

et al. 2023

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“…Lead-free piezoceramics should be classified into four main species: BaTiO 3 -based [3,4], Bi 0.5 Na 0.5 TiO 3 -based, Bi-layered [5], and niobate-based ceramics [6]. Among these, Na 0.5 Bi 0.5 TiO 3 (BNT) lead-free ceramics were first synthesized by Smolenkii et al in 1960 and exhibit a rhombohedral crystal phase around room temperature, with a T c of 320 • C [7].…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric and Dielectric Properties in Bi0.5(Na,K)0.5TiO3-x Ag2O Lead-Free Piezoceramics

Chen,

Liao

2023

Materials

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Lead-free piezoceramics of Bi0.5(Na0.825K0.175)0.5TiO3 with varying concentrations of x mol% Ag2O (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, denoted as BNKT-xA) were fabricated using the solid-state technique. An extensive investigation was undertaken to analyze the structural, piezoelectric, and dielectric properties of these piezoceramics in the presence of Ag ions. There is no evidence of any secondary solid solution in the BNKT-xA piezoceramics. The ceramics with x mol% Ag2O in BNKT still demonstrate the presence of both rhombohedral (R) and tetragonal (T) phases. The addition of Ag+ is helpful to increase the relative density of the BNKT-xA piezoceramics. It is noteworthy that the BNKT-0.3 mol% A piezoceramics show remarkable improvements in their properties (d33 = 147 pC/N, kp = 29.6%, ε = 1199, tanδ = 0.063). These improvements may be ascribed to the denser microstructure and the preservation of morphotropic phase boundaries between R and T phases caused by the appropriate addition of Ag cations. The addition of Ag+ results in the relaxor behavior of the BNKT-xA ceramics, characterized by disorder among A-site cations. With the increase in temperature, the d33 value of BNKT-xA ceramics does not vary significantly in the range of 25 to 125 °C, ranging from 127 to 147 pC/N (with a change of d33 ≤ 13.6%). This finding shows that piezoelectric ceramics have a reliable performance over a certain operating temperature range.

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“…Simultaneous doping of A-site and B-site has been also carried out on other perovskite-structured compounds, resulting in changes in microstructure and properties. Some studies results show that ferroelectric transition temper-ature and electrical properties of oxide compounds are improved by controlling the concentration of defects and reducing leakage current during polarization [12,13].…”

Section: Introductionmentioning

confidence: 99%

Yttrium and Niobium Elements Co-Doping and the Formation of Double Perovskite Structure Ba2YNbO6 in BCZT

Mao

Zheng

et al. 2023

Materials

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The (Ba0.85Ca0.15) (Ti0.90Zr0.10)O3 + x Y3+ + x Nb5+ (abbreviated as BCZT-x(Nb + Y), x = 0 mol%, 0.05 mol%, 0.1 mol%, 0.2 mol%, 0.3 mol%) lead-free piezoceramics samples were prepared by a traditional solid-state sintering method. And the effects of Yttrium and Niobium elements (Y3+ and Nb5+) co-doping on the defect, phase and structure, microstructure, and comprehensive electrical properties have been investigated. Research results show that the Y and Nb elements co-doping can dramatically enhance piezoelectric properties. It is worth noting that XPS defect chemistry analysis, XRD phase analysis and TEM results together show that a new phase of double perovskite structure Barium Yttrium Niobium Oxide (Ba2YNbO6) is formed in the ceramic, and the XRD Rietveld refinement and TEM results show the coexistence of the R-O-T phase. Both these two reasons together lead to significant performance improvements of piezoelectric constant (d33) and planar electro-mechanical coupling coefficient (kp). The functional relation between temperature and dielectric constant testing results present that the Curie temperature increases slightly, which shows the same law as the change of piezoelectric properties. The ceramic sample reaches an optimal performance at x = 0.1% of BCZT-x(Nb + Y), where d33 = 667 pC/N, kp = 0.58, εr = 5656, tanδ = 0.022, Pr = 12.8 μC/cm2, EC = 2.17 kV/cm, TC =92 °C, respectively. Therefore, they can be used as potential alternative materials to lead based piezoelectric ceramics.

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Enhanced dielectric and ferroelectric responses in La3+/Ti4+ co-substituted SrBi2Ta2O9 Aurivillius phase

Cited by 15 publications

References 26 publications

Synthesis and Structure of the Double-Layered Sillén–Aurivillius Perovskite Oxychloride La_2.1Bi_2.9Ti₂O₁₁Cl as a Potential Photocatalyst for Stable Visible Light Solar Water Splitting

Synthesis and Structure of the Double-Layered Sillén–Aurivillius Perovskite Oxychloride La_2.1Bi_2.9Ti₂O₁₁Cl as a Potential Photocatalyst for Stable Visible Light Solar Water Splitting

Piezoelectric and Dielectric Properties in Bi0.5(Na,K)0.5TiO3-x Ag2O Lead-Free Piezoceramics

Yttrium and Niobium Elements Co-Doping and the Formation of Double Perovskite Structure Ba2YNbO6 in BCZT

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Enhanced dielectric and ferroelectric responses in La3+/Ti4+ co-substituted SrBi2Ta2O9 Aurivillius phase

Cited by 15 publications

References 26 publications

Synthesis and Structure of the Double-Layered Sillén–Aurivillius Perovskite Oxychloride La2.1Bi2.9Ti2O11Cl as a Potential Photocatalyst for Stable Visible Light Solar Water Splitting

Synthesis and Structure of the Double-Layered Sillén–Aurivillius Perovskite Oxychloride La2.1Bi2.9Ti2O11Cl as a Potential Photocatalyst for Stable Visible Light Solar Water Splitting

Piezoelectric and Dielectric Properties in Bi0.5(Na,K)0.5TiO3-x Ag2O Lead-Free Piezoceramics

Yttrium and Niobium Elements Co-Doping and the Formation of Double Perovskite Structure Ba2YNbO6 in BCZT

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Synthesis and Structure of the Double-Layered Sillén–Aurivillius Perovskite Oxychloride La_2.1Bi_2.9Ti₂O₁₁Cl as a Potential Photocatalyst for Stable Visible Light Solar Water Splitting

Synthesis and Structure of the Double-Layered Sillén–Aurivillius Perovskite Oxychloride La_2.1Bi_2.9Ti₂O₁₁Cl as a Potential Photocatalyst for Stable Visible Light Solar Water Splitting