Glass - Back to the Future!



Presenting Author:
Pinit Kidkhunthod
<pinit@slri.or.th>

article posted 6 April 2016


Dr Pinit Kidkhunthod is a beamline scientist in charge at SUT-NANOTEC-SLRI XAS beamline (BL5.2), Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, Thailand. His research of interest is in the fields of structural studies of advanced functional materials such as novel glasses and amorphous carbon-based ferrite composite materials using an X-ray absorption spectroscopy (XAS) technique. Dr Pinit Kidkhunthod received his BSc(Physics), first class honors 3.99 from Khon Kaen University, Thailand in 2008, and PhD (Physics) from Bristol University, UK in 2012. He was one of two Thai students representative for DESY summer program, Germany, in 2007. Recently, Dr Kidkhunthod has received research grants for young scientist from Thailand Research Fund (TRF2013) and Ministry of Science and Technology (2014). He is the author of over 30 papers in ISI journals for structural studies of advanced functional materials using XAS technique.






A Combination of Extended X-ray Absorption Spectroscopy and Computer Simulation Study on Praseodymium Gallate Glass

Pinit Kidkhunthod1* & Atipong Bootchanont2
1 Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand
2 School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand


Extended X-ray Absorption Fine Structure (EXAFS) studies have been carried out on a praseodymium gallate glass (Pr3Ga5O12) prepared by aerodynamic levitation and laser heating. The short and intermediate range ordering around the rare-earth have been obtained by combined technique including molecular dynamics simulation (MD). The results give an average PrO coordination number of 668(2) and a mean GaO coordination number of 429(2). A good agreement between the experimental data and the simple molecular dynamics simulations give rising a glass network of a PrO polyhedral structure and a predominant GaO4 tetrahedral network in this glass.


Figure 1. The corresponding Fourier Transformation of Pr3Ga5O12 glasses between experiment (black circle) and MD-EXAFS calculation (red line). Upper figure shows the comparison of PrO EXAFS signal and the lower figure shows comparison of GaO EXAFS signal



Figure 2. The coordination polyhedra of PrO (left) and Ga-O (right) obtained from MD simulation of Pr3Ga5O12 glasses with the cut-off bond lengths of 30 and 23 , respectively