Progress in photorefractive tungsten bronze crystals

Neurgaonkar, Ratnakar R.; Cory, W. K.

doi:10.1364/josab.3.000274

Cited by 205 publications

(74 citation statements)

References 48 publications

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“…Moreover, the effect is not unique to perovskites and is also observed, for example, in the Pb 1-x Ba x Nb 2 O 6 tungsten bronze system 24,38 (see table II). There, the increase in piezoelectric anisotropy close to the MPB occurs markedly in both orthorhombic and tetragonal phases 38 .…”

Section: Rotator and Extender Ferroelectricsmentioning

confidence: 88%

Rotator and extender ferroelectrics: Importance of the shear coefficient to the piezoelectric properties of domain-engineered crystals and ceramics

Davis¹,

Budimir²,

Damjanović³

et al. 2007

Journal of Applied Physics

225

181

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The importance of a high shear coefficient d 15 (or d 24 ) to the piezoelectric properties of domain-engineered and polycrystalline ferroelectrics is discussed.The extent of polarization rotation, as a mechanism of piezoelectric response, is directly correlated to the shear coefficient. The terms "rotator" and "extender" are introduced to distinguish the contrasting behaviors of crystals such as 4mm this is a result of the intrinsic electrostrictive anisotropy of the constituent oxygen octahedra. Finally, for a given symmetry, the piezoelectric anisotropy increases close to ferroelectric-ferroelectric phase transitions; this includes morphotropic phase boundaries and temperature induced polymorphic transitions.* email: matthew.davis@epfl.ch 2

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Section: Rotator and Extender Ferroelectricsmentioning

confidence: 88%

Rotator and extender ferroelectrics: Importance of the shear coefficient to the piezoelectric properties of domain-engineered crystals and ceramics

Davis¹,

Budimir²,

Damjanović³

et al. 2007

Journal of Applied Physics

225

181

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“…The effect is not unique to the MPBs of PMN-xPT and PZN-xPT; indeed, it has been demonstrated phenomenologically in PZT [165,175]. Nor is it unique to perovskites, being observed experimentally at the MPB between orthorhombic and tetragonal phases in the Pb 1−x Ba x Nb 2 O 6 (PBN) tungsten bronze system [176,177].…”

Section: Monoclinic Distortion In the Presence Of Residual Fieldsmentioning

confidence: 99%

Picturing the elephant: Giant piezoelectric activity and the monoclinic phases of relaxor-ferroelectric single crystals

Davis

2007

J Electroceram

124

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Understanding the relationship between the structure and "giant" piezoelectric properties of relaxor ferroelectric solid solutions (1-x)Pb(Mg 1/3 Nb 2/3 )O 3 -xPbTiO 3 [PMNxPT] and (1-x)Pb(Zn 1/3 Nb 2/3 )O 3 -xPbTiO 3 [PZN-xPT] is an extremely difficult task. In this article, three main paradigms are reviewed. In the first, the monoclinic phases present at the morphotropic phase boundary (MPB) are responsible for the giant piezoelectric response in that they allow, or at least facilitate, polarization rotation. In the second, a strong polarization rotation effect is explained by the large piezoelectric shear coefficients of zero-field rhombohedral and orthorhombic phases due to the near degeneracy at the MPB and the intrinsic softness of the relaxor state; zero-field monoclinic symmetries are explained by residually distorted rhombohedral and orthorhombic phases in the presence of internal stresses and/or residual bias fields. In the third, the monoclinic "phases" are composed of very finely twinned rhombohedral or tetragonal domains. In this "adaptive phase" model, based on that for ferroelastic martensites, the large electric-field induced strains are extrinsic in nature and result from the progressive switching of the component "nano-twins"; the ease of polarization rotation is explained by a high domain wall mobility. These paradigms remain to be mutually reconciled. The article includes a thorough review of the history of PMNxPT and PZN-xPT single crystals and, particularly, the most important work done over the last decade.

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“…Tungsten-bronze (TB) compounds belong to an important class of dielectric materials, which display interesting ferroelectric, pyroelectric, piezoelectric and nonlinear optic behaviors [1][2][3]. Since the discovery of ferroelectricity in lead meta-niobate [4,5] and lead meta tantalate [6], there has been rapid progress in search of new TB-type materials, required for various electronic devices such as multi-layer capacitors, transducers, actuators, random access memory, microwave dielectric resonators, phase shifters, pyroelectric detectors, etc because of their relatively high dielectric constant and low dielectric loss [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

et al. 2012

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Abstract:The polycrystalline sample of complex tungsten-bronze type compound (Na 2 Pb 2 La 2 W 2 Ti 4 Ta 4 O 30 ) was prepared by a high-temperature solid-state reaction technique. Room temperature preliminary structural study using X-ray diffraction (XRD) data exhibits the formation of a single-phase new compound. The SEM micrograph of the compound exhibits non uniform rectangular grains distributed throughout the sample surface. Detailed studies of dielectric parameters (ε r , tan δ) as a function of temperature and frequency, and P-E hysteresis (spontaneous polarization) confirmed the existence of ferroelectricity in the material. Complex impedance spectroscopy analysis, carried out as a function of frequency at different temperatures, established a correlation between the microstructure and electrical properties of the material. The electrical relaxation process occurring in the material is temperature dependent. The activation energy found from the Arrhenius plot that the conduction process in the material is of mixed type. The nature of frequency dependence of ac conductivity suggests that the material obeys Jonscher's universal power law.

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Progress in photorefractive tungsten bronze crystals

Cited by 205 publications

References 48 publications

Rotator and extender ferroelectrics: Importance of the shear coefficient to the piezoelectric properties of domain-engineered crystals and ceramics

Rotator and extender ferroelectrics: Importance of the shear coefficient to the piezoelectric properties of domain-engineered crystals and ceramics

Picturing the elephant: Giant piezoelectric activity and the monoclinic phases of relaxor-ferroelectric single crystals

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

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