Report No xxxx - Instytut Fizyki JÄ drowej PAN

STRUCTURE AND ARRANGEMENT OF GLASSY PHOSPHO-
SILICATE MATERIALS STUDIED BY 23 NA, 27 AL, 31 P NMR AND FTIR
METHODS
Zbigniew Fojud a) , Maciej Sitarz b) , Mirosław Handke b) , Stefan Jurga a)
a) Institute of Physics, Adam Mickiewicz University, Poznań, Poland; b) Faculty of Materials
Science and Ceramic, AGH University of Science and Technology, Kraków, Poland
The glassy-crystalline materials obtained via direct crystallization from the glassy state
are one of the most interesting ceramics materials [1]. The analysis of the amorphous
materials structure due to the lack of long-distance order, is rather studied by NMR and FTIR,
which are sensitive for short-distance order, than by x-ray methods. NMR [2] as well as FTIR
were successfully used in studies of this problem [3, 4].
The main goal of the present work is detailed structure analysis of the phosphosilicate
materials studied by NMR and FTIR methods. The 23 Na, 27 Al, and 31 P NMR chemical
shifts are reported in ppm scale from adequate reference lines. All NMR spectra were
recorded using a Bruker DSX 400 MHz spectrometer operating at 105.8, 104.3, 161.9 MHz
for 23 Na, 27 Al, 31 P NMR, respectively. Samples were held in 4 mm zirconia rotors and spun at
15 kHz.
Our studies gave an evidence for chemically inequivalent surroundings of the studied
nuclei. An example of this observation is given in Fig.1 for aluminium ions in the glassy
structure. 27 Al NMR spectrum observed was non-symmetrical due to superposition of
various intra-tetrahedral [AlO 4 ] 5- bonds, as shown in our previous work [2].
70 60 50 40
Fig. 1. The selected 27 Al NMR spectrum of glassy phospho-silicate material.
Maciej Sitarz is a scholarship holder of The Foundation For Polish Science (Scholar Grant
2003).
This work is supported by Polish Committee for Scientific Research under grant no.
PBZ/KBN-013/T08/34.
[1] H. G. Kim, T. Komatsu, J. Mat. Sci. Lett, 17, 1198, (1988).
[2] W. Mozgawa, Z. Fojud, M. Handke, S. Jurga, J. Molec. Struc., 614, 281, (2000).
[3] M. Sitarz, M. Rokita, M. Handke, E. Galuskin, J. Molec. Struc., 651-653, 489, (2003).
[4] M. Handke , M. Sitarz, M. Rokita, E. Galuskin, J. Molec. Struc., 651-653, 39, (2003).
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