Grain size effect in lead-free ferroelectrics and antiferroelectrics

湖南大学“岳麓材料青年学者论坛”第241期

报告二

题 目：Grain size effect in lead-free ferroelectrics and antiferroelectrics

报告人：Dr Haixue Yan

地 点：中四栋二楼报告厅

时 间：2023年9月3日（周日）下午3:00-4:00

主持人：杨斌 教授

邀请人：材料科学与工程学院

报告人简介：

Dr Haixue Yan is a Reader in Materials Science and Engineering at QMUL. He is also the Programme Director of Materials Engineering and an Appeals Panel Chair at QMUL. He is an expert on high temperature piezoelectric, Spark Plasma Sintering (SPS), phase transitions in ferroelectrics, and PVDF-based ferroelectric polymers. He reported for the first-time ferroelectricity and piezoelectricity in layer-structured A₂B₂O₇ ceramics with super-high Curie points (>1450 °C). This work has produced a step-change in the operating temperature of piezoelectric sensors. His work on SPS has demonstrated that nano particles can work as building blocks during fast sintering. His work on ferroelectric characterization has provided evidence to answer open questions on phase transitions in lead-free ferroelectrics including Bi_0.5Na_0.5TiO₃, NaNbO₃ and AgNbO₃-based dielectrics for energy storage applications. Recently his research has focused on PVDF-based polymers for high power energy storage in dielectric capacitors as well as high entropy materials for dielectric applications. He is on the editorial board of Scientific Reports, Advance in Applied Ceramics, Material Research Bulletin and Journal of Advanced Ceramics. Dr. Yan is an FIMMM and FRSC. He has 9 patents and >227 publications in peer-reviewed journals with an H-index of 52. He regularly gives invited/keynote talks in international conferences.