Preparation of ferroelectric bi-layered thin films using the modified polymeric precursor method

Zanetti, S. M.; Leite, E. R.; Longo, E.; Varela, José Arana

doi:10.1590/s1516-14392001000300003

Cited by 14 publications

(5 citation statements)

References 26 publications

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“…Preparation technique Sr 0.2 Na 0.4 Nd 0.4 Bi 4 Ti 4 O 15 is synthesized by the modified polymeric precursor method based on the Pechini process [9]. Here, the resin is obtained by the reaction between a carboxylic acid (citric acid) and an amine (ethanediol), forming a polyamide as a polymer.…”

Section: Methodsmentioning

confidence: 99%

Impedance spectroscopy of Na and Nd doped strontium bismuth titanate

Rizwana¹,

Krishna²,

James

et al. 2007

Cryst. Res. Technol.

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Sr 0.2 Na 0.4 Nd 0.4 Bi 4 Ti 4 O 15 is prepared by Sol-Gel route using the modified polymeric precursor method based on the Pechini process and its electrical properties are investigated by Complex Impedance Spectroscopy (CIS). Results are presented in two ways, complex plane plots (real versus imaginary) and spectroscopic plots (real and imaginary against frequency). CIS has provided convincing evidence for the existence of both grain (bulk) and grain-boundary effects that were separated in the frequency domain of the impedance spectrum. Experimental data are fitted to two parallel RC equivalent circuits in series. The values of resistance and capacitance of bulk and grain boundary contributions are also calculated. Relaxation times are calculated for both grains and grainboundaries. Conduction and charge carrier behaviors are studied from frequency and temperature dependence of ac conductivity. The ac conductivity follows a two-power law behavior at different temperatures with frequency exponents s 1 and s 2 .

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Section: Methodsmentioning

confidence: 99%

Impedance spectroscopy of Na and Nd doped strontium bismuth titanate

Rizwana¹,

Krishna²,

James

et al. 2007

Cryst. Res. Technol.

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“…Besides the interference (proximity of the films and substrates peaks in some cases), there are present broad peaks, which suggests that the films present different degrees of orientation. In this case, the results suggest that there are two regions having different degrees of orientation, with the narrow peak representing a highly oriented interfacial region close to the substrate and the broad peak indicating a more distorted region far from the substrate, according to the literature [14].…”

Section: Rocking Curvementioning

confidence: 54%

Study on the orientation degree of Pb1−xLaxTiO3 thin films by the rocking curve technique and its morphological aspects

Rangel

Bernardi²,

Paskocimas

et al. 2007

Surface and Coatings Technology

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“…The intensity of rocking curve is plotted in logarithmic scale highlighting better the two-contributing curves feature occurring for thicker samples. This effect is to be explained by the presence of two regions having different degrees of orientation, a highly oriented one and more distorted one [ 50 , 51 , 52 ]. The effect is noticeable for the thicker films, e.g., a 132 nm LFO film.…”

Section: Resultsmentioning

confidence: 99%

Thickness-Dependent Photoelectrochemical Water Splitting Properties of Self-Assembled Nanostructured LaFeO3 Perovskite Thin Films

et al. 2021

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Tuning the intrinsic structural and stoichiometric properties by different means is used for increasing the green energy production efficiency of complex oxide materials. Here, we report on the formation of self-assembled nanodomains and their effects on the photoelectrochemical (PEC) properties of LaFeO3 (LFO) epitaxial thin films as a function of layer’s thickness. The variation with the film’s thickness of the structural parameters such as in-plane and out-of-plane crystalline coherence length and the coexistence of different epitaxial orientation—<100>SrTiO3//<001> LFO, <100>SrTiO3//<110> LFO and [110] LFO//[010] STO, as well as the appearance of self-assembled nanodomains for film’s thicknesses higher than 14 nm, is presented. LFO thin films exhibit different epitaxial orientations depending on their thickness, and the appearance of self-assembled nanopyramids-like domains after a thickness threshold value has proven to have a detrimental effect on the PEC functional properties. Using Nb:SrTiO3 as conductive substrate and 0.5 M NaOH aqueous solution for PEC measurements, the dependence of the photocurrent density and the onset potential vs. RHE on the structural and stoichiometric features exhibited by the LFO photoelectrodes are unveiled by the X-ray diffraction, high-resolution transmission electron microscopy, ellipsometry, and Rutherford backscattering spectroscopy results. The potentiodynamic PEC analysis has revealed the highest photocurrent density Jphotocurrent values (up to 1.2 mA/cm2) with excellent stability over time, for the thinnest LFO/Nb:SrTiO3 sample, both cathodic and anodic behavior being noticed. Noticeably, the LFO thin film shows unbiased hydrogen evolution from water, as determined by gas chromatography in aqueous 0.5 M NaOH solution under constant illumination.

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Preparation of ferroelectric bi-layered thin films using the modified polymeric precursor method

Cited by 14 publications

References 26 publications

Impedance spectroscopy of Na and Nd doped strontium bismuth titanate

Impedance spectroscopy of Na and Nd doped strontium bismuth titanate

Study on the orientation degree of Pb1−xLaxTiO3 thin films by the rocking curve technique and its morphological aspects

Thickness-Dependent Photoelectrochemical Water Splitting Properties of Self-Assembled Nanostructured LaFeO3 Perovskite Thin Films

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