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- W620331246 abstract "Abstract The phase composition and structure of sodium–aluminum (iron) phosphate glasses and glass crystalline materials at Fe 2 O 3 substitution for Al 2 O 3 in the glasses of the series (mol%) 40 Na 2 O, (20 − x ) Al 2 O 3 , x Fe 2 O 3 , 40 P 2 O 5 (I) and 35 Na 2 O, (20 − x ) Al 2 O 3 , x Fe 2 O 3 , 45 P 2 O 5 (II) were studied by Fourier Transform Infrared (FTIR), Raman, and Mossbauer spectroscopy techniques. The products in series I poured onto a metal plate were found to be amorphous (glasses) while the annealed samples were partly devitrified except for the sample at x = 10 which remained amorphous. The quenched samples of series II contained AlPO 4 at high Al 2 O 3 content ( x = 0 and x = 5) and were amorphous at high iron content while the annealed samples were mostly devitrified with segregation of ortho- and pyrophosphate phases. The anionic motif of the glasses in both series is mainly composed of ortho- (Q 0 ) and pyrophosphate (Q 1 ) structural units. In the structure of the glasses in series I the Q 0 to Q 1 ratio remains the same at Al 2 O 3 substitution for Fe 2 O 3 within the whole x range whereas in the structure of the glasses in series II the Q 0 to Q 1 ratio changes in favor of the Q 1 units. Annealing of the quenched samples resulted in splitting of the bands in FTIR due to de-degeneration at formation of crystalline phases. Iron in the glasses is present as major Fe(III) and minor Fe(II) both in primarily octahedral oxygen environment." @default.
- W620331246 created "2016-06-24" @default.
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- W620331246 date "2015-10-01" @default.
- W620331246 modified "2023-10-18" @default.
- W620331246 title "The effect of Fe 2 O 3 substitution for Al 2 O 3 on the phase composition and structure of sodium–aluminum–iron phosphate glasses" @default.
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- W620331246 doi "https://doi.org/10.1016/j.jnoncrysol.2015.05.039" @default.
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