First-principles effective Hamiltonian calculations of the electrocaloric effect in ferroelectric BaSr1−TiO3

Tarnaoui, M.; Zaim, M.; Kerouad, M.; Zaim, A.

doi:10.1016/j.physleta.2019.126093

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…According to Pandey et al (2019), at low temperatures, it does not have sufficient power to overcome basic energy between the perovskite (the phase of ferroelectric structure becomes paraelectric) and the midmetastable phase (the phase between the ferroelectric structure and the paraelectric). The results of this study are the same as those reported by Zhou et al [12]; Guo et al [19]; Tarnaoui et al [20]; Everhardt et al [21]; and Wang et al [22]. Therefore, this is then explained by the increase in annealing temperature, which causes the atom to have enough energy to move, so that crystalline is also increasing [23].…”

Section: X-ray Diffraction (Xrd) Characterizationsupporting

confidence: 88%

Characteristic Making of Ba0.4Sr0.6TiO3 Thin Film Nanoparticles

et al. 2022

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Presently, the research on thin films is essentially useful in the world of science and technology. Therefore, this study aims to explore Barium Strontium Titanate (BST) as the basis in the making of dynamic random access memory (DRAM). This DRAM technology produces small cells that have faster operations, lower energy, longer data storage period, and are found to havemade up of Barium Strontium Titanate nanoparticles (Ba0.4Sr0.6TiO3; BST). BST applications in the form of capacitors can be used as gas sensors, temperature sensors, microwave phase shifters, tunable filters, oscillators, infrared sensors, etc.The main component of BST was showed by the sol-gel method, and the device structure constituted of Si/SiO2/RuO2/TiO2 /Ba0.4Sr0.6TiO3/Al. All the samples were annealed at 400, 450, 500, 550, 600, 650 and 700 ℃ for 60 min. The sample was annealed to see the crystalline structure of the sample.The sol gel method was chosen in the process of making thin films of Ba0.4Sr0.6TiO3 (BST) because this method was easier and cheaper than other techniques. The thin film was characterized by optical and electrical properties. The results showed that a rise in the annealing temperature increased the crystalline, grain size, thickness and surface roughness of the sample. The characterization was carried out on the device structure (Si/SiO2/RuO2/TiO2/Ba0.4Sr0.6TiO3/Al) in order to examine the optical and electrical properties, including the current density and the dielectric features. At the annealing temperature of 700 ℃, the device showed the best value, with the absorption peak at the wavelength of 688 nm. And also, with the dielectric constant (εr) of 2,500, capacitance (C) of 22.10 nF, dense alternating current (ρau) of 2.54×104 Ω.m, conductance (σau) of 1.20×10-2 1/Ω.m, and current density of 9.85×10 -5 A.cm-2 at 0.5 V. The results of characterization of this capacitor are very good to be used as an infrared sensor. HIGHLIGHTS The explore Barium Strontium Titanate (BST) as the basis in the making of dynamic random access memory (DRAM) BST applications in the form of capacitors can be used as gas sensors, temperature sensors, microwave phase shifters, tunable filters, oscillators, infrared sensors, etc. The results showed that a rise in the annealing temperature increased the crystalline, grain size, thickness and surface roughness of the sample GRAPHICAL ABSTRACT

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Section: X-ray Diffraction (Xrd) Characterizationsupporting

confidence: 88%

Characteristic Making of Ba0.4Sr0.6TiO3 Thin Film Nanoparticles

et al. 2022

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“…15 As a classic perovskite material, Ba 1−x Sr x TiO 3 (BST) nanomaterials possess remarkable ferroelectric and piezoelectric as well as photoelectric properties. 17 Depending on the molar ratio of Ba/Sr, it presents a variable band gap and large dielectric constant at room temperature. 18 Previously, it was demonstrated that with the Ba/Sr ratio of 7:3, the BST nanomaterials exhibited the narrowest bandwidth and largest dielectric constant, which can be utilized to enhance catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

“…In 2023, Liu et al utilized BiVO 4 with a highly exposed {110} crystal plane and selectively deposited CoO x on them, achieving a hydrogen production rate of ∼2.1 mmol g –1 . As a classic perovskite material, Ba 1– x Sr x TiO 3 (BST) nanomaterials possess remarkable ferroelectric and piezoelectric as well as photoelectric properties . Depending on the molar ratio of Ba/Sr, it presents a variable band gap and large dielectric constant at room temperature .…”

Section: Introductionmentioning

confidence: 99%

Boosting Efficiency in Piezo-Photocatalysis Process Using Poled Ba_0.7Sr_0.3TiO₃ Nanorod Arrays for Pollutant Degradation and Hydrogen Production

Wang,

Zhang,

et al. 2024

ACS Appl. Mater. Interfaces

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Recently, the combination of the piezoelectric effect in the photocatalytic process, referred to as piezo-photocatalysis, has gained considerable attention as a promising approach for enhancing the degradation of organic pollutants. In this investigation, we studied the piezo-photocatalysis by fabricating arrays of barium strontium titanate (Ba 0.7 Sr 0.3 TiO 3 ) nanorods (BST NRs) on a glass substrate as recoverable catalysts. We found that the degradation rate constant k of the rhodamine B solution achieved 0.0447 min −1 using poled BST NRs in the piezo-photocatalytic process, indicating a 2-fold increase in efficiency compared to the photocatalytic process (0.00183 min −1 ) utilizing the same material. This is mainly ascribed to the generation of the piezopotential in the poled BST NRs under ultrasonic vibration. Moreover, the BST NR array demonstrated a hydrogen (H 2 ) production rate of 411.5 μmol g −1 h −1 . In the photoelectrochemical process, the photocurrent density of poled BST NRs achieved 1.97 mA cm −2 at an applied potential of 1.23 V (E RHE (reversible hydrogen electrode)) under ultrasonic vibrations, representing a 1.7-fold increase compared with the poled BST NRs without ultrasonic vibrations. The measurement results from the liquid chromatograph mass spectrometer (LC-MS) demonstrated the formulation of a degradation pathway for rhodamine B molecules. Moreover, ab initio molecular dynamics (AIMD) simulation results demonstrate the dominance of hydroxyl radicals ( • OH) rather than superoxide radicals ( • O 2 − ) in the degradation process. This study not only benefits the understanding of the principle of the piezo-photocatalytic process but also provides a new perspective for improving the catalytic efficiency for organic pollutants degradation.

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A review on different theoretical models of electrocaloric effect for refrigeration

2023

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First-principles effective Hamiltonian calculations of the electrocaloric effect in ferroelectric BaSr1−TiO3

Cited by 9 publications

References 32 publications

Characteristic Making of Ba0.4Sr0.6TiO3 Thin Film Nanoparticles

Characteristic Making of Ba0.4Sr0.6TiO3 Thin Film Nanoparticles

Boosting Efficiency in Piezo-Photocatalysis Process Using Poled Ba_0.7Sr_0.3TiO₃ Nanorod Arrays for Pollutant Degradation and Hydrogen Production

A review on different theoretical models of electrocaloric effect for refrigeration

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First-principles effective Hamiltonian calculations of the electrocaloric effect in ferroelectric BaSr1−TiO3

Cited by 9 publications

References 32 publications

Characteristic Making of Ba0.4Sr0.6TiO3 Thin Film Nanoparticles

Characteristic Making of Ba0.4Sr0.6TiO3 Thin Film Nanoparticles

Boosting Efficiency in Piezo-Photocatalysis Process Using Poled Ba0.7Sr0.3TiO3 Nanorod Arrays for Pollutant Degradation and Hydrogen Production

A review on different theoretical models of electrocaloric effect for refrigeration

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Boosting Efficiency in Piezo-Photocatalysis Process Using Poled Ba_0.7Sr_0.3TiO₃ Nanorod Arrays for Pollutant Degradation and Hydrogen Production