Pub Date : 2008-12-02DOI: 10.1109/ISAF.2008.4693814
C. Diantonio, M. Winter, M. Rodriguez, P. Yang, G. Burns, T. Chavez, A. Blea
The investigation of lead-free piezoelectric ceramic compositions has recently gained an increased level of interest due to the efforts to reduce lead based components. The most widely used piezoelectric/ferroelectric ceramic material today, including specialized ceramics for military applications (ex. sonar), consists of PbTiO3-PbZrO3 (i.e. PZT-system). It has become imperative to integrate a processing strategy with a lead-free ferroelectric material capable of competing with or surpassing the properties of lead-based compositions. This work examines the development of optimal processing parameters through texturing and reactive templated grain growth to selectively engineer a polycrystalline ceramic microstructure. It presents how these parameters can affect the electro-mechanical properties for a sodium bismuth titanate based composition. The final properties for all ceramic materials are highly influenced by the processing steps and forming techniques used to construct the bulk ceramic component. Texturally modified ceramic compositions have recently exhibited enhanced properties that, depending on the system, match and even surpass those of an optimum modified lead-based composition. In this work we report on the development and use of a texture induced forming process combined with reactive templated grain growth to produce grain-oriented polycrystalline bulk ceramics. Thermal analysis, x-ray diffraction characterization, microstructure stereology and the dielectric and electromechanical performance will be presented. A processing space has been characterized and mapped in order to drive towards achieving maximized electrical performance for this lead-free system.
{"title":"Textured processing, reactive templated grain growth, and electrical property relationships for sodium bismuth titanate PI015","authors":"C. Diantonio, M. Winter, M. Rodriguez, P. Yang, G. Burns, T. Chavez, A. Blea","doi":"10.1109/ISAF.2008.4693814","DOIUrl":"https://doi.org/10.1109/ISAF.2008.4693814","url":null,"abstract":"The investigation of lead-free piezoelectric ceramic compositions has recently gained an increased level of interest due to the efforts to reduce lead based components. The most widely used piezoelectric/ferroelectric ceramic material today, including specialized ceramics for military applications (ex. sonar), consists of PbTiO3-PbZrO3 (i.e. PZT-system). It has become imperative to integrate a processing strategy with a lead-free ferroelectric material capable of competing with or surpassing the properties of lead-based compositions. This work examines the development of optimal processing parameters through texturing and reactive templated grain growth to selectively engineer a polycrystalline ceramic microstructure. It presents how these parameters can affect the electro-mechanical properties for a sodium bismuth titanate based composition. The final properties for all ceramic materials are highly influenced by the processing steps and forming techniques used to construct the bulk ceramic component. Texturally modified ceramic compositions have recently exhibited enhanced properties that, depending on the system, match and even surpass those of an optimum modified lead-based composition. In this work we report on the development and use of a texture induced forming process combined with reactive templated grain growth to produce grain-oriented polycrystalline bulk ceramics. Thermal analysis, x-ray diffraction characterization, microstructure stereology and the dielectric and electromechanical performance will be presented. A processing space has been characterized and mapped in order to drive towards achieving maximized electrical performance for this lead-free system.","PeriodicalId":228914,"journal":{"name":"2008 17th IEEE International Symposium on the Applications of Ferroelectrics","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123684848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-02DOI: 10.1109/ISAF.2008.4693764
S. Alpay
Graded ferroelectrics and ferroelectric multilayers have received great interest as active elements in tunable microwave devices and piezoelectric actuators/sensors. There have been a number of experimental studies that show that these materials have many peculiar properties that cannot be described by a simple series connection of the individual layers that make up the heterostructures. A thermodynamic analysis is presented to demonstrate that ferroelectric multilayers interact through internal elastic, electrical, and electromechanical fields and the ¿strength¿ of the coupling can be quantitatively described using Landau theory of phase transformations, theory of elasticity, and principles of electrostatics. In addition to broken spatial inversion symmetry that can lead to asymmetric thermodynamic potentials, the modeling indicates that the electrostatic coupling between the layers leads to the suppression of ferroelectricity at a critical paraelectric layer thickness for ferroelectric-paraelectric bilayers. This bilayer is expected to have a colossal dielectric/piezoelectric response similar to the anomaly near Curie-Weiss temperature in homogeneous ferroelectrics at this critical thickness. This behavior has the characteristics of a ¿phase transformation.¿ The relative thicknesses of the layers can be used as a design parameter for bilayer, multilayers, and graded heterostructures. We present numerical results on the dielectric and piezoelectric response of BaTiO3/SrTiO3 bilayers, and graded BaTiO3-SrTiO3 (BST) and PbZrO3-PbTiO3 (PZT) compounds.
{"title":"Modeling of graded and multilayer ferroelectrics: Dielectric and piezoelectric response","authors":"S. Alpay","doi":"10.1109/ISAF.2008.4693764","DOIUrl":"https://doi.org/10.1109/ISAF.2008.4693764","url":null,"abstract":"Graded ferroelectrics and ferroelectric multilayers have received great interest as active elements in tunable microwave devices and piezoelectric actuators/sensors. There have been a number of experimental studies that show that these materials have many peculiar properties that cannot be described by a simple series connection of the individual layers that make up the heterostructures. A thermodynamic analysis is presented to demonstrate that ferroelectric multilayers interact through internal elastic, electrical, and electromechanical fields and the ¿strength¿ of the coupling can be quantitatively described using Landau theory of phase transformations, theory of elasticity, and principles of electrostatics. In addition to broken spatial inversion symmetry that can lead to asymmetric thermodynamic potentials, the modeling indicates that the electrostatic coupling between the layers leads to the suppression of ferroelectricity at a critical paraelectric layer thickness for ferroelectric-paraelectric bilayers. This bilayer is expected to have a colossal dielectric/piezoelectric response similar to the anomaly near Curie-Weiss temperature in homogeneous ferroelectrics at this critical thickness. This behavior has the characteristics of a ¿phase transformation.¿ The relative thicknesses of the layers can be used as a design parameter for bilayer, multilayers, and graded heterostructures. We present numerical results on the dielectric and piezoelectric response of BaTiO3/SrTiO3 bilayers, and graded BaTiO3-SrTiO3 (BST) and PbZrO3-PbTiO3 (PZT) compounds.","PeriodicalId":228914,"journal":{"name":"2008 17th IEEE International Symposium on the Applications of Ferroelectrics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121761860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-02DOI: 10.1109/ISAF.2008.4693785
A. Sheikh, V. Mathe
Our studies comprise dielectric and magnetoelectric properties of CoFe2O4 and PMNPT ME composites. The individual phases were prepared by conventional ceramic method. The particulate composites of ferrite and ferroelectric phases were prepared in ferroelectric rich region. The presences of both the phases in the composites were characterized by using X-ray diffraction technique. The SEM images were used to study the microstructure of composites. The variation of dielectric constant was studied as a function of temperature at fixed frequencies viz. 1 kHz, 10 kHz, 100 kHz and 1MHz. The polarization vs. electric field (P-E) hysteresis loop for all the composites were also studied which shows their ferroelectric nature.
{"title":"Dielectric and ferroelectric properties of PMN-PT- CoFe2O4 composites","authors":"A. Sheikh, V. Mathe","doi":"10.1109/ISAF.2008.4693785","DOIUrl":"https://doi.org/10.1109/ISAF.2008.4693785","url":null,"abstract":"Our studies comprise dielectric and magnetoelectric properties of CoFe2O4 and PMNPT ME composites. The individual phases were prepared by conventional ceramic method. The particulate composites of ferrite and ferroelectric phases were prepared in ferroelectric rich region. The presences of both the phases in the composites were characterized by using X-ray diffraction technique. The SEM images were used to study the microstructure of composites. The variation of dielectric constant was studied as a function of temperature at fixed frequencies viz. 1 kHz, 10 kHz, 100 kHz and 1MHz. The polarization vs. electric field (P-E) hysteresis loop for all the composites were also studied which shows their ferroelectric nature.","PeriodicalId":228914,"journal":{"name":"2008 17th IEEE International Symposium on the Applications of Ferroelectrics","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122109315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-02DOI: 10.1109/ISAF.2008.4693947
S. Anton, A. Erturk, D. Inman
Small, unmanned air vehicles (UAV) are used for reconnaissance by the military. Many of these are all electric with batteries as the primary source of energy. This talk explores the idea of extending the battery life (or flight time) of an electric radio controlled plane by using several harvesting concepts combined into one aircraft. Piezoceramic based harvesting using fiber based piezoceramic composites are in integrated into the wings. A cantilever type actuator is integrated into the fuselage and solar panels are integrated into the upper surfaces. Experimental flight information combined with theoretical analysis concerning the optimal integration of material will be presented.
{"title":"Energy harvesting from small unmmaned air vehicles","authors":"S. Anton, A. Erturk, D. Inman","doi":"10.1109/ISAF.2008.4693947","DOIUrl":"https://doi.org/10.1109/ISAF.2008.4693947","url":null,"abstract":"Small, unmanned air vehicles (UAV) are used for reconnaissance by the military. Many of these are all electric with batteries as the primary source of energy. This talk explores the idea of extending the battery life (or flight time) of an electric radio controlled plane by using several harvesting concepts combined into one aircraft. Piezoceramic based harvesting using fiber based piezoceramic composites are in integrated into the wings. A cantilever type actuator is integrated into the fuselage and solar panels are integrated into the upper surfaces. Experimental flight information combined with theoretical analysis concerning the optimal integration of material will be presented.","PeriodicalId":228914,"journal":{"name":"2008 17th IEEE International Symposium on the Applications of Ferroelectrics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124021205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-02DOI: 10.1109/ISAF.2008.4693766
Junwoo Son, S. Stemmer
In this presentation we report on the influence of dielectric relaxation on the thermal leakage characteristics of Pt/SrTiO3/Pt thin film structures. We study the influence of temperature and time-dependent leakage currents on recently reported phenomena such as anomalous positive temperature coefficient of resistivity and resistive switching behavior. SrTiO3 was chosen as a model thin film because the dielectric relaxation is not influenced by ferroelectric polarization, as, for example, for (Ba,Sr)TiO3 thin films. We have measured the leakage currents of sputtered, strongly (110) textured SrTiO3 thin films with Pt top and bottom electrodes as a function of time, film thickness, bias field and temperature. We show that apparent dielectric relaxation times decrease with film thickness and increasing temperature and ranged between 1 Ç¿Ï 100 seconds. We show that hysteresis in the I¿V characteristics is strongly correlated with the non-steady state characteristics of the electrical characteristics. The sign of the applied bias field influenced both dielectric relaxation times and hysteresis, reflecting different trap state distributions near bottom and top contacts and/or different barrier heights. Measurements of the leakage currents under applied bias fields as a function of temperature showed distinctive peak was observed around 260K that could be correlated with non-steady state current. We show that for thick films results can be interpreted in terms of trapping/detrapping in the ! depletion region of the blocking contacts. Finally we report on the influence of oxygen vacancies on the hysteresis of the I¿V characteristics and non-steady state current.
{"title":"Influence of dielectric relaxation on thermal electrical characteristics of SrTiO3 thin films with Pt electrodes","authors":"Junwoo Son, S. Stemmer","doi":"10.1109/ISAF.2008.4693766","DOIUrl":"https://doi.org/10.1109/ISAF.2008.4693766","url":null,"abstract":"In this presentation we report on the influence of dielectric relaxation on the thermal leakage characteristics of Pt/SrTiO3/Pt thin film structures. We study the influence of temperature and time-dependent leakage currents on recently reported phenomena such as anomalous positive temperature coefficient of resistivity and resistive switching behavior. SrTiO3 was chosen as a model thin film because the dielectric relaxation is not influenced by ferroelectric polarization, as, for example, for (Ba,Sr)TiO3 thin films. We have measured the leakage currents of sputtered, strongly (110) textured SrTiO3 thin films with Pt top and bottom electrodes as a function of time, film thickness, bias field and temperature. We show that apparent dielectric relaxation times decrease with film thickness and increasing temperature and ranged between 1 Ç¿Ï 100 seconds. We show that hysteresis in the I¿V characteristics is strongly correlated with the non-steady state characteristics of the electrical characteristics. The sign of the applied bias field influenced both dielectric relaxation times and hysteresis, reflecting different trap state distributions near bottom and top contacts and/or different barrier heights. Measurements of the leakage currents under applied bias fields as a function of temperature showed distinctive peak was observed around 260K that could be correlated with non-steady state current. We show that for thick films results can be interpreted in terms of trapping/detrapping in the ! depletion region of the blocking contacts. Finally we report on the influence of oxygen vacancies on the hysteresis of the I¿V characteristics and non-steady state current.","PeriodicalId":228914,"journal":{"name":"2008 17th IEEE International Symposium on the Applications of Ferroelectrics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125659986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-02DOI: 10.1109/ISAF.2008.4693737
Xuhui Lu, R. W. Schwartz, W. Huebner
The electric field distribution, field and power density enhancement factors, power loss and stored electric energy in dielectric composites were calculated using the boundary-element method (BEM). The composites consist of a low permittivity host containing either spherical conducting inclusions having dielectric coating shells, or dielectrically or conductively graded spherical dielectric particles. It is shown that the local electric field and power density enhancement effects diminish as the thickness of shells, the number of grading layers or the degree of nonlinearity of grading increases. The reduced enhancement effects significantly increase the normalized stored electric energy due to the fact that with a reduced enhancement factor a higher voltage can be applied. Frequency effects for composites with conductivity-graded particles were also considered. The results of these studies have implications for the design of high energy density dielectric composites.
{"title":"HP007 modeling permittivity and conductivity contrast on electric energy storage properties of dielectric composites","authors":"Xuhui Lu, R. W. Schwartz, W. Huebner","doi":"10.1109/ISAF.2008.4693737","DOIUrl":"https://doi.org/10.1109/ISAF.2008.4693737","url":null,"abstract":"The electric field distribution, field and power density enhancement factors, power loss and stored electric energy in dielectric composites were calculated using the boundary-element method (BEM). The composites consist of a low permittivity host containing either spherical conducting inclusions having dielectric coating shells, or dielectrically or conductively graded spherical dielectric particles. It is shown that the local electric field and power density enhancement effects diminish as the thickness of shells, the number of grading layers or the degree of nonlinearity of grading increases. The reduced enhancement effects significantly increase the normalized stored electric energy due to the fact that with a reduced enhancement factor a higher voltage can be applied. Frequency effects for composites with conductivity-graded particles were also considered. The results of these studies have implications for the design of high energy density dielectric composites.","PeriodicalId":228914,"journal":{"name":"2008 17th IEEE International Symposium on the Applications of Ferroelectrics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129864434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-02DOI: 10.1109/ISAF.2008.4693829
Jaehyuk Park, J. Akedo
We demonstrate a fabrication of ferroelectric optical nanocomposite thick films by aerosol deposition method (ADM) and report their highly enhanced optical and electrical characteristics. Nanocomposite gold / PZT 3-¿m-thick films acquired the enhanced surface plasmon resonance at a wavelength of 640 nm as well as the enhanced electrical properties. The strength and the position of surface plasmon resonance at the nanocomposite films deposited by ADM could be controlled by adjusting the concentration and the shape of nanogold in the host matrix.
{"title":"Fabrication of ferroelectric optical nanocomposite thick films by aerosol deposition method","authors":"Jaehyuk Park, J. Akedo","doi":"10.1109/ISAF.2008.4693829","DOIUrl":"https://doi.org/10.1109/ISAF.2008.4693829","url":null,"abstract":"We demonstrate a fabrication of ferroelectric optical nanocomposite thick films by aerosol deposition method (ADM) and report their highly enhanced optical and electrical characteristics. Nanocomposite gold / PZT 3-¿m-thick films acquired the enhanced surface plasmon resonance at a wavelength of 640 nm as well as the enhanced electrical properties. The strength and the position of surface plasmon resonance at the nanocomposite films deposited by ADM could be controlled by adjusting the concentration and the shape of nanogold in the host matrix.","PeriodicalId":228914,"journal":{"name":"2008 17th IEEE International Symposium on the Applications of Ferroelectrics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129406608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-02DOI: 10.1109/ISAF.2008.4693747
O. Wunnicke, M. Klee, K. Reimann, C. Renders, H. van Esch, W. Keur, J. Zhao, M. de Wild, A. Roest
Galvanic piezoelectric RF MEMS switches are presented. The switches are completely processed and characterized mechanically and electrically. The mechanic deformation and switching times are discussed. Closing of the switch can be achieved within less than 10 ¿s. Electrical measurements yield contact resistances in the order of 50 ¿ and isolation resistance of more than 1 G¿.
{"title":"MI007: Galvanic piezoelectric RF MEMS switches","authors":"O. Wunnicke, M. Klee, K. Reimann, C. Renders, H. van Esch, W. Keur, J. Zhao, M. de Wild, A. Roest","doi":"10.1109/ISAF.2008.4693747","DOIUrl":"https://doi.org/10.1109/ISAF.2008.4693747","url":null,"abstract":"Galvanic piezoelectric RF MEMS switches are presented. The switches are completely processed and characterized mechanically and electrically. The mechanic deformation and switching times are discussed. Closing of the switch can be achieved within less than 10 ¿s. Electrical measurements yield contact resistances in the order of 50 ¿ and isolation resistance of more than 1 G¿.","PeriodicalId":228914,"journal":{"name":"2008 17th IEEE International Symposium on the Applications of Ferroelectrics","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131504084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-02DOI: 10.1109/ISAF.2008.4693790
N. Ortega, Ashok Kumar, R. Katiyar
Structural, microscopic, magnetization, and dielectric properties of the multiferroic composite ceramics consisting of BiFeO3 (BTO)1¿x¿NiFe2O4 (NFO)x (x = 0.05, 0.1, 0.15, 0.2, 0.3, 0.4) prepared by conventional solid state route were investigated. The x-ray diffraction, Raman spectra, and SEM micrographs showed the presence of constituent phases in the composite. The variation of the dielectric constant with frequency in the range of 100 Hz to 1 MHz shows both, decrease in ¿¿ and significant frequency dispersion accompanied with an increase in the loss tangent, with increase in NFO concentration in the composites. The BTO-NFO composites exhibited well-defined magnetic hysteresis loops at room temperature. The temperature variation of the magnetization showed indirect converse magneto electric coupling for the critical value (x=0.40) of the composite near the BTO phase transition (orthorhombic-tetragonal).
{"title":"Structural, dielectric, electrical and magnetic properties of multiferroic BaTiO3-NiFe2O4 composite ceramic","authors":"N. Ortega, Ashok Kumar, R. Katiyar","doi":"10.1109/ISAF.2008.4693790","DOIUrl":"https://doi.org/10.1109/ISAF.2008.4693790","url":null,"abstract":"Structural, microscopic, magnetization, and dielectric properties of the multiferroic composite ceramics consisting of BiFeO3 (BTO)1¿x¿NiFe2O4 (NFO)x (x = 0.05, 0.1, 0.15, 0.2, 0.3, 0.4) prepared by conventional solid state route were investigated. The x-ray diffraction, Raman spectra, and SEM micrographs showed the presence of constituent phases in the composite. The variation of the dielectric constant with frequency in the range of 100 Hz to 1 MHz shows both, decrease in ¿¿ and significant frequency dispersion accompanied with an increase in the loss tangent, with increase in NFO concentration in the composites. The BTO-NFO composites exhibited well-defined magnetic hysteresis loops at room temperature. The temperature variation of the magnetization showed indirect converse magneto electric coupling for the critical value (x=0.40) of the composite near the BTO phase transition (orthorhombic-tetragonal).","PeriodicalId":228914,"journal":{"name":"2008 17th IEEE International Symposium on the Applications of Ferroelectrics","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121538558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-02DOI: 10.1109/ISAF.2008.4693739
M. Letz, M.J. Davis, B. Hoppe
Obtaining a glass ceramic via devitrification of a fully amorphous glass phase leads to a pore-free material, in which crystallites with their ferroelectric phase are embedded in a residual glass matrix. This matrix in turn forms a close-to-ideal dielectric. Such a structure offers, in principle, several advantages over conventional sintered ceramics, particularly with respect to ageing and fatigue. We show examples of ferroelectric glass ceramics in which the composition of the ferroelectric phase as well as the size of the crystallites are varied in a systematic way. The dielectric and structural properties are discussed in detail.
{"title":"Glass ceramics with ferroelectric crystalline phases","authors":"M. Letz, M.J. Davis, B. Hoppe","doi":"10.1109/ISAF.2008.4693739","DOIUrl":"https://doi.org/10.1109/ISAF.2008.4693739","url":null,"abstract":"Obtaining a glass ceramic via devitrification of a fully amorphous glass phase leads to a pore-free material, in which crystallites with their ferroelectric phase are embedded in a residual glass matrix. This matrix in turn forms a close-to-ideal dielectric. Such a structure offers, in principle, several advantages over conventional sintered ceramics, particularly with respect to ageing and fatigue. We show examples of ferroelectric glass ceramics in which the composition of the ferroelectric phase as well as the size of the crystallites are varied in a systematic way. The dielectric and structural properties are discussed in detail.","PeriodicalId":228914,"journal":{"name":"2008 17th IEEE International Symposium on the Applications of Ferroelectrics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124413351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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