Compaction of lead zirconate titanate sol–gel coatings

Khan, Mikael A.; Kurchania, Rajnish; Corkovic, S.; Zhang, Qi; Milne, Steven J.

doi:10.1016/j.matlet.2005.11.046

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…When the 350°C pyrolysis step was omitted, extensive porosity developed in the film. Porosity formation in films fabricated from solutions with large organic clusters is especially problematic, as the organics typically require both higher volatization temperatures and are sterically bulky, leaving behind a larger open volume upon evaporation . It is likely that the use of two pyrolysis steps slows the pyrolysis process, allowing the removal of organic species, followed by the rearrangement of molecular groups into a dense film.…”

Section: Resultsmentioning

confidence: 99%

Cubic Pyrochlore Bismuth Zinc Niobate Thin Films for High‐Temperature Dielectric Energy Storage

Michael

Trolier-McKinstry

2015

J. Am. Ceram. Soc.

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Thin films of cubic pyrochlore bismuth zinc niobate, a lead-free dielectric, were fabricated using a solution chemistry based upon the Pechini method. Scanning electron microscopy confirmed that the films are smooth and mostly dense. The films exhibit a dielectric constant of 145 AE 5, a low dielectric loss of 0.00065 AE 0.0001, and a room temperature, 1 kHz maximum field of approximately 4.7 MV/cm. At frequencies of 100 Hz and 10 kHz, the maximum field sustained by the material increased to 5.0 MV/cm and 5.1 MV/cm, although the dielectric loss increased to 0.0065 AE 0.001. At a measurement frequency of 10 kHz, the maximum energy storage density was 60.8 AE 2.0 J/cm 3 , while at a measurement frequency of 100 Hz, the maximum energy storage was~46.7 AE 1.7 J/cm 3 . As the temperature was increased to 200°C, the breakdown strength of the films decreased, while the loss tangent remained modest. At 200°C and a measurement frequency of 100 Hz, the maximum energy storage density was~23.1 AE 0.8 J/cm 3 , and at 10 kHz, the maximum energy storage density was 27.3 AE 1.0 J/cm 3 .

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Section: Resultsmentioning

confidence: 99%

Cubic Pyrochlore Bismuth Zinc Niobate Thin Films for High‐Temperature Dielectric Energy Storage

Michael

Trolier-McKinstry

2015

J. Am. Ceram. Soc.

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“…2). The degree of shrinkage can be reduced by maximising the green density of the film though compaction [46], bimodal powder distributions and sol gel infiltration [25]. Beyond this approach, the absolute amount of volume shrinkage remains constant for a given processes the only way to reduce the stress generated is to encourage material relaxation such that the ceramic film shrinks more in the thickness direction than it does in the in plane directions.…”

Section: Managementmentioning

confidence: 99%

Challenges in Integration of Piezoelectric Ceramics in Micro Electromechanical Systems

Dorey

2008

MSF

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Lead zirconate titanate (PZT) thick films, a few tens of micrometres thick, are of technological interest for integration with microsystems to create micro electromechanical systems (MEMS) with high sensitivity and power output. This paper examines the challenges faced in integrating thick film PZT with other materials to create functional micro devices. Thermal, chemical and mechanical challenges associated with integration will be examined and potential solutions explored.

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“…For these reasons, in the present work, we develop and study porous BaTiO 3 (pBTO) thin films as photoanodes, prepared by a soft template-assisted sol–gel method, which allows large-scale coating capability and precise control of the chemical composition. , We show that it is possible to tune the porosity in BaTiO 3 thin films using a facile and low-cost approach while retaining ferroelectric polarization. Importantly, we further demonstrate that the PEC performance can still be controlled via the ferroelectric polarization in porous BaTiO 3 thin films using electrochemical (EC) poling of the porous films.…”

Section: Introductionmentioning

confidence: 98%

Controlled Porosity in Ferroelectric BaTiO₃ Photoanodes

Augurio

Álvarez-Fernández

Panchal

et al. 2022

ACS Appl. Mater. Interfaces

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The use of ferroelectric polarization to promote electron–hole separation has emerged as a promising strategy to improve photocatalytic activity. Although ferroelectric thin films with planar geometry have been largely studied, nanostructured and porous ferroelectric thin films have not been commonly used in photo-electrocatalysis. The inclusion of porosity in ferroelectric thin films would enhance the surface area and reactivity, leading to a potential improvement of the photoelectrochemical (PEC) performance. Herein, the preparation of porous barium titanate (pBTO) thin films by a soft template-assisted sol–gel method is reported, and the control of porosity using different organic/inorganic ratios is verified by the combination of scanning electron microscopy and ellipsometry techniques. Using piezoresponse force microscopy, the switching of ferroelectric domains in pBTO thin films is observed, confirming that the ferroelectric polarization is still retained in the porous structures. In addition, the presence of porosity in pBTO thin films leads to a clear improvement of the PEC response. By electrochemical poling, we also demonstrated the tuning of the PEC performance of pBTO thin films via ferroelectric polarization. Our work offers a simple and low-cost approach to control the morphology optimization of ferroelectric thin films, which could open up the development of materials with great potential for PEC applications.

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Compaction of lead zirconate titanate sol–gel coatings

Cited by 6 publications

References 16 publications

Cubic Pyrochlore Bismuth Zinc Niobate Thin Films for High‐Temperature Dielectric Energy Storage

Cubic Pyrochlore Bismuth Zinc Niobate Thin Films for High‐Temperature Dielectric Energy Storage

Challenges in Integration of Piezoelectric Ceramics in Micro Electromechanical Systems

Controlled Porosity in Ferroelectric BaTiO₃ Photoanodes

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Compaction of lead zirconate titanate sol–gel coatings

Cited by 6 publications

References 16 publications

Cubic Pyrochlore Bismuth Zinc Niobate Thin Films for High‐Temperature Dielectric Energy Storage

Cubic Pyrochlore Bismuth Zinc Niobate Thin Films for High‐Temperature Dielectric Energy Storage

Challenges in Integration of Piezoelectric Ceramics in Micro Electromechanical Systems

Controlled Porosity in Ferroelectric BaTiO3 Photoanodes

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Controlled Porosity in Ferroelectric BaTiO₃ Photoanodes