History and recent progress in ferroelectrets produced in Brazil

作     者：Ruy Alberto Pisani Altafim Ruy Alberto Corrêa Altafim 

作者机构：Computer Systems DepartmentInformatics CenterFederal University of Paraíba João PessoaPBBrazil Electrical and Computer DepartmentUniversity of São PauloSão CarlosSPBrazil 

出 版 物：《Journal of Advanced Dielectrics》 (先进电介质学报（英文）)

年 卷 期：2023年第13卷第4期

页      面：27-34页

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：FAPESP CNPq CAPES 

主　　题：Cellular electrets piezoelectrets ferroelectrets electromechanical films 

摘      要：More than 30 years ago,a group of researchers in Tampere-Finland developed a thin foamed polymeric material for capacitive *** soft-voided films exhibited electrical charging characteristics,forming a powerful combination,which resulted in a smart-material with ferroelectric *** discovery of the electro-thermo mechanical film(ETMF)has sparked the curiosity of the electret community,leading to the development of several *** that time,ETMF became known as cellular electrets and,later,as ferroelectrets or piezoelectrets regarding their electromechanical *** paper provides a timeline review of the research on ferroelectrets produced in Brazil,between the years 1990 and 2020,towards demonstrating how the interest in the electret electrical charging mechanism has resulted in the use of ferroelectrets with well-controlled cavities for ultrasound applications.