{"id":91751,"date":"2018-03-11T10:10:35","date_gmt":"2018-03-11T10:10:35","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/respuesta-extrinseca-y-comportamiento-no-lineal-en-materiales-ceramicos-piezoelectricos\/"},"modified":"2018-03-11T10:10:35","modified_gmt":"2018-03-11T10:10:35","slug":"respuesta-extrinseca-y-comportamiento-no-lineal-en-materiales-ceramicos-piezoelectricos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/dielectricos\/respuesta-extrinseca-y-comportamiento-no-lineal-en-materiales-ceramicos-piezoelectricos\/","title":{"rendered":"Respuesta extrinseca y comportamiento no lineal en materiales ceramicos piezoelectricos"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Diego Alejandro Ochoa Guerrero <\/strong><\/h2>\n<p>The study of the elastic,  dielectric and piezoelectric non- linear behavior in pzt-based and knn-based piezoelectric ceramics represent the  main goal of this work. Both systems present a perovskite-like structure. Several experimental set-ups were designed, mounted and  automated to be used in this study.     first, the elastic non-linear response, in resonance, is measured. The purpose is to study the variation of the elastic coefficient of the  material when it is submitted to high stress. A model is formulated based on the variation of the coefficients due to the increase in amplitude  of the high stress applied. The correspondence between the model and the experimental observations is verified. The results show a good  agreement in soft pzt case but not in hard pzt, confirming that is not possible to assume a non-linear -like dependence for hard pzt  coefficients.     secondly, we take a view of the dielectric, piezoelectric and elastic response over the temperature. The purpose of the study is to evaluate  the contribution of the extrinsic effect to piezoceramics response. Anomalous behavior of the macroscopic properties of the hard pzt  around the room temperature is observed. A preliminary model is proposed to explain such behavior. The contribution of the extrinsic  effect to the macroscopic  properties in a knn compound is evaluated and the results suggest that the anomaly observed around room  temperature would be associated, in this case, with the presence of a structural transition between two ferroelectric phases.     temperature dependent non-linear dielectric response is also observed. The study was carried out by measuring the dielectric permittivity at  low frequencies and at high applied electric fields in a temperature range from 20k till 400k. The results have been analyzed using the  rayleigh model. The change in the hard pzt dynamic walls is shown and explained through an intuitive model. The results obtained in the  knn system display a soft pzt like behavior at room temperature. Nevertheless, the anomaly observed in the dielectric proper ties around  room temperature was associated to the above mentioned structural transition between two ferroelectric phases.     finally, temperature dependent mechanical non-linear response in soft pzt ceramics is studied. The variations of the coefficients with the  stress and with the temperature are studied and the similarities between the linear and non-linear regime are assessed. It is observed that  the change of the extrinsic contribution with the temperature is qualitatively similar that the variation observed by the application of the high  mechanical stress, thus indicating that the effect is due to a common phenomenon.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Respuesta extrinseca y comportamiento no lineal en materiales ceramicos piezoelectricos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Respuesta extrinseca y comportamiento no lineal en materiales ceramicos piezoelectricos <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Diego Alejandro Ochoa Guerrero <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 19\/02\/2009<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Alfonso Albareda Tiana<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Mar\u00eda   Luisa Martinez sarrion <\/li>\n<li>lorena Pardo mata (vocal)<\/li>\n<li>Jos\u00e9 Antonio Eiras (vocal)<\/li>\n<li>Jos\u00e9 Francisco Fern\u00e1ndez lozano (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Diego Alejandro Ochoa Guerrero The study of the elastic, dielectric and piezoelectric non- linear behavior in pzt-based [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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