Ferroelectric, dielectric and piezoelectric properties of ferroelectric thin films and ceramics are reviewed with the aim of providing an insight into different processes which may affect the behaviour of ferroelectric devices, such as ferroelectric memories and micro-electro-mechanical systems. Taking into consideration recent advances in this field, topics such as polarization switching, polarization fatigue, effects of defects, depletion layers, and depolarization fields on hysteresis loop behaviour, and contributions of domain-wall displacement to dielectric and piezoelectric properties are discussed. An introduction into dielectric, pyroelectric, piezoelectric and elastic properties of ferroelectric materials, symmetry considerations, coupling of electro-mechanical and thermal properties, and definitions of relevant ferroelectric phenomena are provided.

https://iopscience.iop.org/article/10.1088/0034-4885/61/9/002/pdf

Ferroelectric, dielectric and piezoelectric properties of ferroelectric thin films and ceramics

A number of materials have been explored for their use as artificial muscles Among these, dielectric elastomers (DEs) appear to provide the best combination of properties for true muscle-like actuation DEs behave as compliant capacitors, expanding in area and shrinking in thickness when a voltage is applied Materials combining very high energy densities, strains, and efficiencies have been known for some time To date, however, the widespread adoption of DEs has been hindered by premature breakdown and the requirement for high voltages and bulky support frames Recent advances seem poised to remove these restrictions and allow for the production of highly reliable, high-performance transducers for artificial muscle applications

Advances in dielectric elastomers for actuators and artificial muscles.

The perovskitelike ferroelectric system ${\mathrm{PbZr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ (PZT) has a nearly vertical morphotropic phase boundary (MPB) around $x=0.45--0.50.$ Recent synchrotron x-ray powder diffraction measurements by Noheda et al. [Appl. Phys. Lett. 74, 2059 (1999)] have revealed a monoclinic phase between the previously established tetragonal and rhombohedral regions. In the present work we describe a Rietveld analysis of the detailed structure of the tetragonal and monoclinic PZT phases on a sample with $x=0.48$ for which the lattice parameters are, respectively, ${a}_{t}=4.044$ \AA{}, ${c}_{t}=4.138$ \AA{}, at 325 K, and ${a}_{m}=5.721$ \AA{}, ${b}_{m}=5.708$ \AA{}, ${c}_{m}=4.138$ \AA{}, $\ensuremath{\beta}=90.496\ifmmode^\circ\else\textdegree\fi{},$ at 20 K. In the tetragonal phase the shifts of the atoms along the polar [001] direction are similar to those in ${\mathrm{PbTiO}}_{3}$ but the refinement indicates that there are, in addition, local disordered shifts of the Pb atoms of $\ensuremath{\sim}0.2$ \AA{} perpendicular to the polar axis. The monoclinic structure can be viewed as a condensation along one of the $〈110〉$ directions of the local displacements present in the tetragonal phase. It equally well corresponds to a freezing-out of the local displacements along one of the $〈100〉$ directions recently reported by Corker et al. [J. Phys.: Condens. Matter 10, 6251 (1998)] for rhombohedral PZT. The monoclinic structure therefore provides a microscopic picture of the MPB region in which one of the ``locally'' monoclinic phases in the ``average'' rhombohedral or tetragonal structures freezes out, and thus represents a bridge between these two phases.

/pdf/tetragonal-to-monoclinic-phase-transition-in-a-ferroelectric-4nueoqvjmd.pdf

Tetragonal-to-monoclinic phase transition in a ferroelectric perovskite : The structure of PbZr0.52Ti0.48O3

High-Performance Piezoelectric Energy Harvesters and Their Applications

Advantages and Challenges of Relaxor-PbTiO3 Ferroelectric Crystals for Electroacoustic Transducers- A Review.

1. Introduction - Characteristics of ferroelectrics. 2. Methods for measuring physical properties of ferroelectric materials. 3. Perovskite-type ferroelectrics (Part I). 4. Perovskite-type ferroelectrics (Part II). 5. Lithium niobate and lithium tantalate. 6. Ferroelectric tungsten - bronze type niobate crystals. 7. KDP family, TGS family and other water-soluble ferroelectric crystals. 8. Other ferroelectric crystal materials. 9. Organic ferroelectric materials and piezoelectric composites.

/pdf/ferroelectric-materials-and-their-applications-460hvxjjn8.pdf

Ferroelectric materials and their applications

https://personalpages.manchester.ac.uk/staff/j.gough/lectures/te/7_8_bone/BONE_ENG/ceramic/ceram4.pdf

The effect of pH on the structural evolution of accelerated biomimetic apatite.

Ferroelectric thin films are playing a growing role as key elements in variety of devices. For various techniques of ferroelectric thin film preparation, the sol-gel processing is one of the most promising. In comparison with different deposition techniques, we survey the intrinsic advantages and the recent improvements of the sol-gel processing. In this review paper, several interesting topics, including epitaxial growth and grain-orientation, symmetric and asymmetric P-E hysteresis loops, heterojunction effect of the interface between film and substrate, to attest pyroelectricity of the films, electrooptic coefficients in poled and unpoled films, possibility of amorphous ferroelectrics, etc., are introduced.

Ferroelectric thin films prepared by sol-gel processing

Background/Aims: A crucial step in providing clinically relevant applications of cardiovascular tissue engineering involves the identification of a suitable cell source. The objecti

Human Adipose Stem Cells: A Potential Cell Source for Cardiovascular Tissue Engineering

Mesure des proprietes optiques, pyroelectriques, ferroelectriques et electro-optiques. On obtient un indice de refraction optique de 2,31 et un coefficient electro-optique lineaire effectif de 30×30 −12 m/V

Yuhuan Xu

Papers

Ferroelectric materials and their applications

The effect of pH on the structural evolution of accelerated biomimetic apatite.

Ferroelectric thin films prepared by sol-gel processing

Human Adipose Stem Cells: A Potential Cell Source for Cardiovascular Tissue Engineering

Ferroelectric Sr0.60Ba0.40Nb2O6 thin films by the sol-gel process: Electrical and optical properties.