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 (Pr3
) 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 Pr–O coordination number of 6·68(2) and a mean Ga–O coordination number of 4·29(2). A good agreement between the experimental data and the simple molecular dynamics simulations give rising a glass network of a Pr–O polyhedral structure and a predominant GaO4
tetrahedral network in this glass.
Figure 1. The corresponding Fourier Transformation of Pr3
glasses between experiment (black circle) and MD-EXAFS calculation (red line). Upper figure shows the comparison of Pr–O EXAFS signal and the lower figure shows comparison of Ga–O EXAFS signal
Figure 2. The coordination polyhedra of Pr–O (left) and Ga-O (right) obtained from MD simulation of Pr3
glasses with the cut-off bond lengths of 3·0 Å and 2·3 Å, respectively