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Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Materials Physics 2018
August 16-17, 2018
Page 54
conference
series
.com
August 16-17, 2018 | London, UK
4
th
International Conference on
Condensed Matter and Materials Physics
Chao Nan Xu, Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C2-016
Approaches to the new field of multi-piezo: Ceramics, films and composites
P
iezoluminescence, which is also called elasticoluminescence, is a form of mechanoluminescence (ML) during the elastic
deformation, which has attracted considerable attention because it can be repeatedly used for mechano-optical conversion.
Elastic ML offers the advantages of wireless detection and nondestructive analysis, making it a promising candidate for various
applications, such as stress sensing and damage diagnosis, and in particular for immediate
in situ
dynamic visualization of stress
distribution in industrial plants, buildings, and living organisms. In piezoelectric materials, mechanical stimuli generate electricity,
a phenomenon that is widely utilized in industry and daily life. Recently, we have found the first well-known piezo multifunctional
material that exhibits both piezoelectricity and efficient elastic ML. By precisely tuning the Li/Nb ratio in nonstoichiometric
LiNbO
3
:Pr
3+
, a material that exhibits an unusually high piezoluminescence intensity, which far exceeds that of any well-known
piezoelectric material, is produced. LiNbO
3
:Pr
3+
shows excellent strain sensitivity at the lowest strain level, with no threshold for
stress sensing. These multipiezo properties are useful for nano-micro sensing, damage diagnosis, electro-mechano-optical energy
conversion, and multifunctional control in optoelectronics.
Figure 1:
ML response of LiNbO3:Pr.
Recent Publications
1. J Li et al. (2018) Tailoring bandgap and trap distribution via Si or Ge substitution for Sn to improvemechanoluminescence
in Sr
3
Sn
2
O
7
:Sm
3+
layered perovskite oxide. Act. Mater. 145:462-469.
2. DTu et al. (2017) LiNbO
3
:Pr
3+
: amulti-piezomaterial with simultaneous piezoelectricity and sensitive piezoluminescence.
Adv. Mater. 29(22):1-4.
3. A Yoshida et al. (2017) Mechanoluminescent testing as an efficient inspection technique for the management of
infrastructures. J. Disas. Res. 12(3):506-514.
4. Y Fujio et al. (2016) Sheet sensor using SrAl
2
O
4
:Eu mechanoluminescent material for visualizing inner crack of high-
pressure hydrogen vessel. Int. J. Hydrogen Energy. 41(2):1333-1340.
Biography
Chao Nan Xu is the Principle Research Manager at National Institute of Advanced Science and Technology (AIST), Founder and Chair of Mechanoluminescence
Technology Consortium, Fellow of the Ceramic Society of Japan. She has been concurrently serving as Full Professor of New Material Lab at Kyushu University since
2005. She discovered the intensive new type of elasticoluminescence, and established the hybrid concept of inorganic/organic composite coating (skins) and the principle
for quantitative analysis of stress/strain and faults. She also made discovery of grain size effect for gas sensitivity. She pioneered the new repeatable mechanoluminescent
materials and their novel applications particularly in lighting, health care, and stress/strain visualization.
cn-xu@aist.go.jpChao Nan Xu
National Institute of Advanced Science and Technology, Japan