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Nano Research & Applications
ISSN: 2471-9838
Volume 4
December 10-12, 2018
Rome, Italy
Advanced Materials 2018
Nano Engineering 2018
Page 33
JOINT EVENT
22
nd
International Conference on
Advanced Materials
and Simulation
&
22
nd
Edition of International Conference on
Nano Engineering &
Technology
D
ielectric capacitors are very attractive for high power
energy storage. However, the low energy density of these
capacitors, which is mainly limited by the dielectric material,
is still the bottleneck for their applications. In this work, lead
free single phase perovskite Srx Bi1-xNa0.97-xLi0.03) 0.5TiO3
(x=0.30 and 0.38) bulk ceramics were prepared using solid state
reaction method and were carefully studied for the dielectric
capacitor application. Polar nano regions (PNRs) were created
in this material using co-substitution at A-site to enable relaxor
behaviour with low remnant polarization (Pr) and high maximum
polarization (Pmax). Moreover, Pmax was further increased due
to the electric field induced reversible phase transitions in nano
regions. Comprehensive structural and electrical studies were
performed to confirm the PNRs and reversible phase transitions
and finally a high energy density (1.70 J/cm3) with an excellent
efficiency (87.2%) was achieved using the contribution of field-
induced rotations of PNRs and PNR related reversible transitions
in this material, making it among the best performing lead free
dielectric ceramic bulk material for high energy storage.
Biography
Yan H is a Senior Lecturer in Materials in the School of Engineering and Mate-
rials Science at Queen Mary University of London (QMUL). He has completed
his PhD in Materials Science and Technology at Shanghai Institute of Ceram-
ics in 2001. Since that he joined QMUL as an Academic Visitor and Research
Assistant. At QMUL, he was appointed as an Academic Fellow in 2011 and
Senior Lecturer in 2015. His research area includes processing and analysis of
the microstructures and properties of advanced materials with textured, nano
andmetastable structures, covering dielectrics, ferroelectrics, thermo electrics
and ceramic-CNT composites.
h.x.yan@qmul.ac.ukBNT based ceramics with polar
nano regions for high power
energy storage
Yan H
Queen Mary University of London, UK
Yan H, Nano Res Appl 2018, Volume 4
DOI: 10.21767/2471-9838-C7-026