报告时间：2025年11月13日星期四10:00-12:00

报告地点：知新楼C座C1111

Dr Ming Li

University of Nottingham, UK

Electroceramics often exhibit complex electrical behaviours involving different types of charge carriers (e.g., electrons, holes, ions) and inhomogeneity in different regions (e.g., grains, grain boundaries, surface layers). Such complex electrical behaviours are often associated with defects and low levels of nonstoichiometry (typically < 1 at%) induced by impurities in raw materials, deliberate chemical doping or 'accidental' element loss/gain during sample processing. Measuring electrical and dielectric properties, interpreting impedance data and understanding electrical conduction mechanisms in electroceramics can be challenging.

This presentation discusses oxide ion and electronic conduction in a number of important ferroelectric and piezoelectric ceramics including barium titanate (BaTiO₃), sodium bismuth titanate (Na_1/2Bi_1/2TiO₃), lead zirconate titanate (PZT), potassium sodium niobate (KNN). A particular focus is to demonstrate a general mechanism to suppress both oxide ion and electronic conduction in BaTiO₃ for high-voltage, high-temperature dielectric application.

Dr Ming Li is an Associate Professor at the Advanced Materials Research Group, Faculty of Engineering, University of Nottingham. He obtained his PhD in 2008 from the Department of Materials Science and Engineering, University of Sheffield under the supervision of Professor Derek Sinclair. Upon completing his PhD, he remained in the Sinclair group working as a Postdoctoral Research Associate until 2013. He then worked with Professor Matthew Rosseinsky FRS in the Department of Chemistry at the University of Liverpool before starting his independent academic career at the University of Nottingham in 2014.

Dr Li specialises in probing electrical conduction mechanisms and defect chemistry of electroceramics using a variety of electrical characterisation techniques, particularly Impedance Spectroscopy. This approach enables deep understanding of composition-structure-property relationships in electroceramics. His current research focuses on design and synthesis of pure electronic or ionic conductors and mixed ionic-electronic conductors for applications in electro-/photo-catalysis, fuel cells, batteries, and oxygen separation membranes, as well as dielectric, ferroelectric, piezoelectric materials for applications in electronic devices.