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Materials Science at Oregon State University

Synthesis and Structure-property Relationships in Lead-free Piezoelectric Ceramics

Date: Thursday, Feb 15th
Presenter: Dr Alicia Manjón Sanz, OSU Chemistry

Abstract


Piezoelectric materials are widely used in modern industry to transform electrical signals into mechanical strain and vice versa. Currently, piezoceramic actuators in commercial use are based on Lead Zirconate Titanate, PbZr1-xTixO3 (PZT), which shows a high piezoelectric coefficient (d33) of 200-600 pC/N. However, the toxicity of lead has spurred considerable interest in the discovery of lead-free piezoelectric materials to replace PZT. Analyzing the structure of a material is crucial to understand its physical properties to rationally design and tune new materials with the desired properties. Over the last decades, this ardous task has been acomplished for PZT. In this seminar, I will talk about the structure-property relationships of few lead-free piezoelectric and ferroelectric materials. Firstly, I will present our attempts to find a new lead-free piezoelectric material with properties that overpass the ones of PZT. I will introduce the system Bi(Ti3/8Fe2/8Mg3/8)O3 - CaTiO3 which displays a d33 of 53 pC/N along with a detailed structural study for this material. In the second part of this seminar, I will talk about our efforts to link the structure of the known ceramic BaTiO3- BiInO3 to its piezoelectric, ferroelectric and dielectric properties.

Bio:
Alicia Manjón Sanz received her B.Sc. in Chemistry from the Universidad Autonoma de Madrid in 2008. She worked at the Institute of Catalysis and Petrochemistry in Spain for two years and acquired experience in synthesis of zeolites / zeotypes (catalytic materials), their characterization and in heterogeneous catalytic reactions. Then, she obtained a Marie Curie Early Stage Researcher fellowship and moved to the United Kingdom where she worked in the Rosseinsky group and received her Ph.D. from the University of Liverpool in 2015. Alicia spent also half of her Ph. D. in the Takata laboratory at the SPring-8 synchrotron in Japan. She studied the structure of bismuth based electroceramic perovskites using the MEM-Rietveld method. Currently, she is a Postdoctoral Scholar in the Dolgos group at Oregon State University. Her current research project focuses on using the Pair Distribution Function method to investigate the local structure of a high-performing piezoelectric material as a function of electric fields. Her research interests lie in synthesis and elucidation of the structure-property relationships in advanced functional materials. She hopes to secure a faculty position at a research university for Fall 2018.