Pyroelectric ceramics and thin films for applications in uncooled infra-red sensor arrays

Whatmore, R. W.; Zhang, Qi; Shaw, Christopher P.; Dorey, Robert; Alcock, Jeffery R

doi:10.1088/0031-8949/2007/t129/002

Cited by 35 publications

(13 citation statements)

References 23 publications

(28 reference statements)

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“…One mode operates at a temperature below (but typically near) the Curie temperature T C of the ferroelectric where the variation in the spontaneous polarization as a function of temperature is large. In the dielectric bolometer mode, one works slightly above T C in the paraelectric state of the ferroelectric and with an applied bias field to induce polarization [5][6][7][8][9]. In either case, it is required that the ferroelectric is deposited in a thin film form on an IC compatible substrate.…”

Section: Application Of Electrothermal Properties Of Ferroelectricsmentioning

confidence: 99%

Electrothermal properties of perovskite ferroelectric films

et al. 2009

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The electrothermal (electrocaloric and pyroelectric) properties of ferroelectric thin films have many applications in active solid-state cooling and infrared sensing devices. It has been shown experimentally that some thin-film ferroelectrics can produce much larger electrothermal responses than their bulk counterparts. In this work, the electrothermal properties of bulk polar dielectric (ferroelectric and incipient ferroelectric) materials and thin films have been computed using a thermodynamic methodology and the effects of electrical, thermal and mechanical boundary conditions have been illustrated. In particular, the sensitivity of pyroelectric and electrocaloric response to bias and driving fields, lateral clamping and misfit strain, thermal stresses and composition have been demonstrated. The computations show that the electrothermal behavior of ferroelectric materials for practical cooling devices depends on a complex interplay of several related sets of physical phenomena. These include the nature of the ferroelectric transition, the particular dependence of the equilibrium and transport properties on electric field and mechanical boundary constraints, and the orientation and thermal expansion coefficients of the thin film and substrate materials. The combined results provide insights concerning how the composition and orientation of the thin film material, the choice of substrate, the deposition/annealing temperature, and the electrode configuration can be used to optimize the electrothermal properties for particular applications.

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Section: Application Of Electrothermal Properties Of Ferroelectricsmentioning

confidence: 99%

Electrothermal properties of perovskite ferroelectric films

et al. 2009

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show abstract

“…One mode operates at a temperature below (but typically near) the Curie temperature T C of the ferroelectric where the variation in the spontaneous polarization as a function of temperature is large. In the dielectric bolometer mode, one works slightly above T C in the paraelectric state of the ferroelectric and with an applied bias field to induce polarization [98][99][100][101][102]. In either case, it is required that the ferroelectric is deposited in a thin film form on a substrate compatible with the integrated circuits technology.…”

Section: Pzt (Pbtio 3 -Pbzro 3 Solid Solution)mentioning

confidence: 99%

Recent advances in perovskites: Processing and properties

Moure

Peña

2015

Progress in Solid State Chemistry

143

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The perovskite structure is one of the most wonderful to exist in nature. It obeys to a quite simple chemical formula, ABX 3 , in which A and B are metallic cations and X, an anion, usually oxygen. The anion packing is rather compact and leaves interstices for large A and small B cations. The A cation can be mono, di or trivalent, whereas B can be a di, tri, tetra, penta or hexavalent cation. This gives an extraordinary possibility of different combinations and partial or total substitutions, resulting in an incredible large number of compounds. Their physical and chemical properties strongly depend on the nature and oxidation states of cations, on the anionic and cationic stoichiometry, on the crystalline structure and elaboration techniques, etc.In this work, we review the different and most usual crystalline representations of perovskites, from high (cubic) to low (triclinic) symmetries, some well-known preparation methods, insisting for instance, in quite novel and original techniques such as the mechanosynthesis processing. Physical properties are reviewed, emphasizing the electrical (proton, ionic or mixed conductors) and catalytic properties of Mn-and Co-based perovskites ; a thorough view on the ferroelectric properties is presented, including piezoelectricity, thermistors or pyroelectric characteristics, just to mention some of them ; relaxors, microwave and optical features are also discussed, to end up with magnetism, superconductivity and multiferroïsme.Some materials discussed herein have already accomplished their way but others have promising horizons in both fundamental and applied research.To our knowledge, no much work exists to relate the crystalline nature of the different perovskite-type compounds with their properties and synthesis procedures, in particular with the most recent and newest processes such as the mechanosynthesis approach. Although this is not intended to be a full review of all existing perovskite materials, this report offers a good compilation of the main compounds, their structure and microstructure, processing and relationships between these features.

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“…Integrated infrared sensors [29] and thin-film capacitors [30] are other examples of ferroelectric thin-film technologies. Electrothermal energy interconversion by means of the electrocaloric effect is also under extensive research [31].…”

Section: I22 Ferroelectric Thin-film Technologiesmentioning

confidence: 99%

Nanoscale Ferroelectrics and Multiferroics

Algueró¹

2016

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Pyroelectric ceramics and thin films for applications in uncooled infra-red sensor arrays

Cited by 35 publications

References 23 publications

Electrothermal properties of perovskite ferroelectric films

Electrothermal properties of perovskite ferroelectric films

Recent advances in perovskites: Processing and properties

Nanoscale Ferroelectrics and Multiferroics

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