Keynote Speaker 1

 

DEVELOPMENTS IN HIGH RELIABILITY LEAD-FREE SOLDERS BY SYNCHROTRON AND HIGH-VOLTAGE TEM

   

 PROFESSOR KAZUHIRO NOGITA

Dr Nogita graduated as an Engineer in Japan in 1990 and worked in the nuclear power industry with Hitachi Ltd. He was awarded a PhD from Kyushu University in 1997 and has subsequently worked on a variety of research projects, including the development of materials for alternative power industries and environmentally friendly applications. He migrated to Australia in 1999 after accepting a position at the University of Queensland, where he became the founding director of the Nihon Superior Centre for the Manufacture of Electronic Materials (NS CMEM) within the School of Mechanical & Mining Engineering in July 2012. He is also an invited Professor at Kyushu University and at the University of Malaysia Perlis. His research is in three major areas, namely lead-free solders, hydrogen-storage alloys and light metals. He holds 13 international patents and has authored over 180 refereed scientific papers and has a current ‘h-index’ of 38. He has been instrumental in the establishment of a hydrogen storage spin-off company, Hydrexia Pty. Ltd., and participated in the World Solar Challenge, one of the largest solar car racing event between Darwin to Adelaide in Australia, as a member of TeamArrow.

  

Keynote abstract

This presentation provides an overview of how advanced characterisation approaches, such as Synchrotron facilities and high voltage transmission electron microscopy, can be used in the development of in high reliability lead-free solders and soldering processes. The following two practical/experimental advanced approaches will be discussed along with their use in international collaborative projects, (1) Synchrotron X-ray imaging (in-situ solidification and soldering of solder alloys and for the formation in the solder joint intermetallics) at SPring-8 synchrotron, (2) Ultra-high voltage transmission electron microscopy (In-situ heating/cooling observation for Cu6Sn5 intermetallic compound in solder joints) at Kyushu University and Synchrotron Powder Diffractions (In-situ powder diffraction and In-situ plate diffraction for solder joint intermetallics, phase stability and thermal expansion characterisation) at the Australian Synchrotron. This research has been conducted under an international cooperative research program between the University of Queensland and Kyushu University, Kyoto University, Imperial College London, UniMAP, Nihon Superior Co, Australian Synchrotron, SPring-8 synchrotron, The Australian Research Council (ARC), The Australian Academy of Science, and The Japan Society for the Promotion of Science (JSPS). 

 

 

 

 

 

 

 

Keynote Speaker 2

 

ELECTRONIC AND THERMOELECTRIC PROPERTIES OF CA 1-X SM X MNO3 (X = 0.08 AND 0.17) USING FIRST PRINCIPLES METHOD

 

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 ASSOCIATE PROFESSOR DR. ABDULLAH CHIK

 

Keynote abstract

The search for clean energy conversion technologies led to study of thermoelectric materials that can convert heat to electricity. The dimensionless figure of merit (ZT) is a parameter for comparing thermoelectric materials and ZT ≥ 1 is useful for practical applications. Even though there are materials that exceed these value, oxides with low ZT are considered promising due to less toxicity and stability at high temperature. The challenge is to increase the figure of merit of these oxides with doping so that the thermal conductivity will be reduced while enhancing the conductivity and the Seebeck coefficient. In this paper, the electronic structure and thermoelectric properties of CaMnO3 doped with 8% and 17% f block element Sm using first principles calculations and semi-classic Boltzmann theory were presented in this paper. The G-type AFM phase is most stable among five phases for CaMnO3, however, with 8% and 17% Sm doping, these compounds became nonmagnetic phases. CaMnO3 calculated electronic band structure shows an indirect band gap of 0.523 eV, which is underestimated by the density functional theory (DFT) calculations but the band gap explains the semiconducting behavior.  However, with 8% and 17% Sm doping, the electronic bandstructure of these compounds exhibit metallic behavior, with Sm 4f and Mn 3d electrons contributing to conduction band, increasing the magnitude of conductivity for doped compounds. All temperature dependence Seebeck coefficient plots show n-typed conduction for all compound with reduced magnitude of Seebeck coefficient for doped compounds. The temperature dependence thermal conductivity plot shows overall thermal conductivity is reduced in Sm doped compound. CaMnO3 with 17% Sm doping exhibit much higher ZT of 0.32 at 800 K showing enhanced thermoelectric properties at high temperature and suitability or high temperature energy conversion devices.    

 

 

 

 

 

Keynote Speaker 3

 

LOCAL STRUCTURE DETERMINATION IN FUNCTIONAL MATERIALS BY SYNCHROTRON X-RAY ABSORPTION SPECTROSCOPY

 

 

 ASSOCIATE PROFESSOR DR. RATTIKORN YIMNIRUN

 

Keynote abstract

Functional magnetic materials have been widely studied for their novel magnetic and electronic properties. The global and local structure information could be investigated by a combination of X-ray Diffraction (XRD) and Synchrotron X-ray Absorption Spectroscopy (SXAS) techniques. In this work, magnetic spinel ferrite MnFe2O4 and cobalt-oxide based CoxFe1−xS2 nanocrystals were investigated for their global and local structure information. The phase formation behavior was also investigated in detail via several conventional techniques, including thermal analysis, Scanning Electron Microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS). A change in local structure was investigated using both X-ray Absorption Near-Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) measurements. The results will be presented and discussed in detail.

 

 

 

Invited Speaker 1

 

SYNCHROTRON RADIATION MICROTOMOGRAPHY: FROM MEDICAL TO MATERIAL APPLICATIONS

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DR. CATLEYA ROJVIRIYA

 

Thailand Synchrotron

 

THAILAND

 

 

 

 

 

Invited Speaker 2

 

 

 DR SOMCHAI TANCHARAKORN

 

Thailand Synchrotron

 

THAILAND