Electric characterization by impedance spectroscopy of ceramics of niobate oxide o...
| Grant number: | 11/08497-6 |
| Support type: | Research Grants - Young Investigators Grants |
| Duration: | January 01, 2012 - December 31, 2014 |
| Field of knowledge: | Engineering - Materials and Metallurgical Engineering |
| Principal Investigator: | Eduardo Antonelli |
| Grantee: | Eduardo Antonelli |
| Home Institution: | Instituto de Ciência e Tecnologia (ICT). Universidade Federal de São Paulo (UNIFESP). Campus São José dos Campos. São José dos Campos , SP, Brazil |
| Assoc. researchers: | Antônio Carlos Hernandes ; Fernando Henrique Cristovan ; Manuel Henrique Lente |
| Associated scholarship(s): | 12/16845-7 - Study and characterization of composite ceramics of BaTi1-xZrxO3, BP.IC |
Abstract
Due to the necessity of new friendly environment materials production, recently, many researches have been conducted with the aim of developing a substitute material that can compete with the unique properties of PZT. Among the principal candidates are the barium titanate-based (BT) materials. However, the pure BT or even their solid solutions have lower physical properties compared to the lead-based compounds. Among the various options proposed to improve the properties of the BT, the production of materials where different ferroelectrics phases coexist has attracted great attention. In this project we propose to design, prepare and study of materials where the ferroelectric phases of the system Ba1-xCaxTiO3 (BCT), (Ba1-xSrx) TiO3 (BST) and Ba (ZrxTi1-x) O3 (BZT) (combinations including) can coexist. For the sample preparation, two approaches should be established: i) mixing and sintering of two or more compounds using new concepts of sintering to prevent the complete solid solution formation between them, ii) production of materials with functional graded composition ranging from one to the other side of the sample. With these samples, we will study the ferroelectric, dielectric and piezoelectric materials properties, mainly by exploiting the characteristics of coupled phase transitions. Furthermore, we can also verify and discuss the interfaces influence on the materials properties employing these two approaches (i and ii).The production of new materials with improved properties is expected. Thus, this proposal is innovative in the production of lead-free materials for several applications. (AU)