Grain core-grain shell structure in ceramic-ceramic dielectrics

Zhou, Zhigang; Zhang, Weilong; Wu, Youqing; Zhang, Ruitao

doi:10.1080/00150199008016500

Cited by 11 publications

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“…However, the field remains unexplored. For instance, for the poling procedure and large signal applications it is important to point out that dielectric breakdown is improved with a core–shell microstructure due to a better local electric field distribution and resistivity . Moreover, it should also be noted that in some KNN‐based piezoelectrics the electromechanical properties actually decreased with a core–shell microstructure .…”

Section: Core–shell Approachmentioning

confidence: 99%

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System

et al. 2015

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The design of core-shell materials affords additional degrees of freedom to tailor functional properties as compared to solid solution counterparts. Although to date most of the work in core-shell materials has focused on dielectrics, piezoelectric coreshell ceramics may gain similar interest. Generalities of core-shell functional ceramics features are addressed in this work. A model system, Bi 1/2 Na 1/2 TiO 3 -SrTiO 3 , is introduced to discuss structure-property relationships. We demonstrate that this system features a core-shell microstructure for the composition corresponding to 25 at.% Sr. The material is studied by means of macroscopic functional properties and in situ structural characterization techniques at different length scales, such as X-ray diffraction, transmission electron microscopy, and Raman spectroscopy. The evolution of the core-shell with field and temperature determines its functional properties. The high strain of the system, 0.3% at 4 kV/mm, is due to an electric-field-induced phase transition of the core and shell. Upon field removal the core remains in a poled state, whereas the shell is characterized by a reversible transformation. The reversibility of the phase transition of shells and associated switching are key features in the observed giant strain. Dielectric anomalies are found to be related to changes in oxygen octahedral tilting angles within the core and shell.

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Section: Core–shell Approachmentioning

confidence: 99%

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System

et al. 2015

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“…244,245 This reduces the attractiveness of this approach for industrial applications and hence highlights the potential of core-shell materials since they can be processed in situ during a conventional solid state route. Core-shell materials have experienced an increased interest due to technologically relevant dielectric [246][247][248][249][250][251][252] , piezoelectric 253 , and multiferroic 244,254 properties. Within nanotechnology developments, there has been a continuous increase in organic and inorganic core-shell nanoparticle discoveries with exceptional properties.…”

Section: Design Of Heterogeneous Materialsmentioning

confidence: 99%

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Acosta

2016

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Theoretical Background

Acosta¹

2016

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

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Grain core-grain shell structure in ceramic-ceramic dielectrics

Cited by 11 publications

References 1 publication

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Theoretical Background

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Grain core-grain shell structure in ceramic-ceramic dielectrics

Cited by 11 publications

References 1 publication

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3–SrTiO3 System

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3–SrTiO3 System

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Theoretical Background

Contact Info

Product

Resources

About

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System