Structural and optical analyses of sol–gel synthesized hafnium-doped barium calcium titanate

Fernandez, Jude; Bindhu, B.; Prabu, M.; Sandhya, K

doi:10.1007/s12034-021-02633-w

Cited by 4 publications

(3 citation statements)

References 59 publications

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“…The process of producing thick films for PEH structure involves the development of a liquid chemical route, such as the sol-gel process, that enables the deposition of active layers on a substrate. As far as the liquid synthesis of hafnium-based barium titanate is concerned, few studies deal with BHT materials, but we can cite Fernandez et al [12] who recently developed a nitrate-based sol-gel route to synthetize Ba 0.85 Ca 0.15 Hf x Ti 1−x O 3 (x = 0 to 0.15) and studied their optical properties in thin films. With this in mind, we have developed a sol-gel route of hafnium-doped barium titanate [10] and demonstrated the piezoelectric potential obtained on bulk material by this route.…”

Section: Introductionmentioning

confidence: 99%

BaHf0.05Ti0.95O3 Ceramics from Sol–Gel and Solid-State Processes: Application to the Modelling of Piezoelectric Energy Harvesters

Brault,

Boy,

Levassort

et al. 2024

Materials

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A typical piezoelectric energy harvester is a bimorph cantilever with two layers of piezoelectric material on both sides of a flexible substrate. Piezoelectric layers of lead-based materials, typically lead zirconate titanate, have been mainly used due to their outstanding piezoelectric properties. However, due to lead toxicity and environmental problems, there is a need to replace them with environmentally benign materials. Here, our main efforts were focused on the preparation of hafnium-doped barium titanate (BaHfxTi1−xO3; BHT) sol–gel materials. The original process developed makes it possible to obtain a highly concentrated sol without strong organic complexing agents. Sol aging and concentration can be controlled to obtain a time-stable sol for a few months at room temperature, with desired viscosity and colloidal sizes. Densified bulk materials obtained from this optimized sol are compared with a solid-state synthesis, and both show good electromechanical properties: their thickness coupling factor values are around 53% and 47%, respectively, and their converse piezoelectric coefficient values are around 420 and 330 pm/V, respectively. According to the electromechanical properties, the theoretical behavior in a bimorph configuration can be simulated to predict the resonance and anti-resonance frequencies and the corresponding output power values to help to design the final device. In the present case, the bimorph configuration based on BHT sol–gel material is designed to harvest ambient vibrations at low frequency (<200 Hz). It gives a maximum normalized volumetric power density of 0.03 µW/mm3/Hz/g2 at 154 Hz under an acceleration of 0.05 m/s2.

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Section: Introductionmentioning

confidence: 99%

BaHf0.05Ti0.95O3 Ceramics from Sol–Gel and Solid-State Processes: Application to the Modelling of Piezoelectric Energy Harvesters

Brault,

Boy,

Levassort

et al. 2024

Materials

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“…Furthermore, we improve the piezoelectric properties of the material by introducing Ca 2+ and Pr 3+ . 17,18 It is well known that the piezoelectric properties of inorganic materials are better than those of organic materials. However, the traditional inorganic piezoelectric materials show macroscopic brittleness, which is difficult to recover after the catalytic degradation of dyes, resulting in secondary pollution.…”

Section: Introductionmentioning

confidence: 99%

“…The A-site or B-site doping of BTO is carried out by elements to enhance the piezoelectric properties of BTO. Furthermore, we improve the piezoelectric properties of the material by introducing Ca 2+ and Pr 3+ . , …”

Section: Introductionmentioning

confidence: 99%

Flexible (Ba,Ca)TiO₃:Pr Nanofiber Membranes for Catalytic Piezoelectric Degradation of Organic Dyes

Wang

et al. 2023

ACS Appl. Nano Mater.

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Piezoelectric catalysis has become an emerging research field in recent years, which has received extensive attention. Nanoparticles and nanowires have been developed as piezoelectric catalytic materials. However, in practical research, the use of nanoparticles is not easy for the recovery of samples and will cause secondary pollution, and the current piezoelectric catalysis requires the help of high-frequency ultrasound, which increases the consumption of extra energy and cannot be applied on a large scale. In this study, a self-supporting macroscopic flexible inorganic (Ba,Ca)TiO3:Pr nanofiber membrane was successfully prepared by electrospinning. Natural energy (water flushing) was used to drive the flexible inorganic (Ba,Ca)TiO3:Pr nanofiber membrane for piezoelectric catalytic degradation of organic dyes. The results show that the flexible inorganic (Ba,Ca)TiO3:Pr nanofiber membrane driven by water washing has an obvious piezoelectric catalytic degradation effect on dyes. When the water flow rate was 450 L/h and the concentration of CR solution was 10 mg/L, the catalytic efficiency can reach 91.69%. This study provides a green and feasible method for the preparation of flexible inorganic piezoelectric catalytic materials and the catalytic degradation of organic dyes.

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Enhanced solar absorbance and infrared emittance in Co-doped BaTiO3

He,

Wang,

et al. 2024

Journal of the European Ceramic Society

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Structural and optical analyses of sol–gel synthesized hafnium-doped barium calcium titanate

Cited by 4 publications

References 59 publications

BaHf0.05Ti0.95O3 Ceramics from Sol–Gel and Solid-State Processes: Application to the Modelling of Piezoelectric Energy Harvesters

BaHf0.05Ti0.95O3 Ceramics from Sol–Gel and Solid-State Processes: Application to the Modelling of Piezoelectric Energy Harvesters

Flexible (Ba,Ca)TiO₃:Pr Nanofiber Membranes for Catalytic Piezoelectric Degradation of Organic Dyes

Enhanced solar absorbance and infrared emittance in Co-doped BaTiO3

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Structural and optical analyses of sol–gel synthesized hafnium-doped barium calcium titanate

Cited by 4 publications

References 59 publications

BaHf0.05Ti0.95O3 Ceramics from Sol–Gel and Solid-State Processes: Application to the Modelling of Piezoelectric Energy Harvesters

BaHf0.05Ti0.95O3 Ceramics from Sol–Gel and Solid-State Processes: Application to the Modelling of Piezoelectric Energy Harvesters

Flexible (Ba,Ca)TiO3:Pr Nanofiber Membranes for Catalytic Piezoelectric Degradation of Organic Dyes

Enhanced solar absorbance and infrared emittance in Co-doped BaTiO3

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Flexible (Ba,Ca)TiO₃:Pr Nanofiber Membranes for Catalytic Piezoelectric Degradation of Organic Dyes