2008 17th IEEE International Symposium on the Applications of Ferroelectrics最新文献_第5页

Textured processing, reactive templated grain growth, and electrical property relationships for sodium bismuth titanate PI015 钛酸铋钠PI015的织构加工、活性模板晶粒生长和电性能关系

2008 17th IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2008-12-02 DOI: 10.1109/ISAF.2008.4693814

C. Diantonio, M. Winter, M. Rodriguez, P. Yang, G. Burns, T. Chavez, A. Blea

{"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}

引用次数: 0

Modeling of graded and multilayer ferroelectrics: Dielectric and piezoelectric response 梯度和多层铁电体的建模:介电和压电响应

2008 17th IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2008-12-02 DOI: 10.1109/ISAF.2008.4693764

S. Alpay

{"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}

引用次数: 0

Dielectric and ferroelectric properties of PMN-PT- CoFe2O4 composites PMN-PT- CoFe2O4复合材料的介电和铁电性能

2008 17th IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2008-12-02 DOI: 10.1109/ISAF.2008.4693785

A. Sheikh, V. Mathe

引用次数: 0

Energy harvesting from small unmmaned air vehicles 小型无人驾驶飞行器的能量收集

2008 17th IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2008-12-02 DOI: 10.1109/ISAF.2008.4693947

S. Anton, A. Erturk, D. Inman

引用次数: 8

Influence of dielectric relaxation on thermal electrical characteristics of SrTiO3 thin films with Pt electrodes 介质弛豫对Pt电极SrTiO3薄膜热电特性的影响

2008 17th IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2008-12-02 DOI: 10.1109/ISAF.2008.4693766

Junwoo Son, S. Stemmer

{"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}

引用次数: 0

HP007 modeling permittivity and conductivity contrast on electric energy storage properties of dielectric composites HP007模型对介电复合材料储能性能的介电常数和电导率对比

2008 17th IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2008-12-02 DOI: 10.1109/ISAF.2008.4693737

Xuhui Lu, R. W. Schwartz, W. Huebner

引用次数: 0

Fabrication of ferroelectric optical nanocomposite thick films by aerosol deposition method 气溶胶沉积法制备铁电光学纳米复合材料厚膜

2008 17th IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2008-12-02 DOI: 10.1109/ISAF.2008.4693829

Jaehyuk Park, J. Akedo

引用次数: 0

MI007: Galvanic piezoelectric RF MEMS switches MI007:电压电射频MEMS开关

2008 17th IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2008-12-02 DOI: 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

引用次数: 0

Structural, dielectric, electrical and magnetic properties of multiferroic BaTiO3-NiFe2O4 composite ceramic 多铁BaTiO3-NiFe2O4复合陶瓷的结构、介电、电学和磁性能

2008 17th IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2008-12-02 DOI: 10.1109/ISAF.2008.4693790

N. Ortega, Ashok Kumar, R. Katiyar

引用次数: 1

Glass ceramics with ferroelectric crystalline phases 具有铁电晶体相的玻璃陶瓷

2008 17th IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2008-12-02 DOI: 10.1109/ISAF.2008.4693739

M. Letz, M.J. Davis, B. Hoppe

引用次数: 0