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- W2090324681 abstract "X-ray diffraction patterns have been made of three samples of soda-boric oxide glass of the following molal compositions: 0.114 Na2O, 0.225 Na2O, and 0.333 Na2O. The patterns were made in an evacuated camera, using MoK α radiation monochromatic by reflection from rock salt. Radial distribution curves for the three compositions were obtained by Fourier analysis. The first peak of the distribution curves is due to the boron-oxygen separation. The distances are 1.37, 1.42, and 1.48A. From the peak areas, the number of oxygens about a boron is found to be 3.2, 3.7, and 3.9. The continuous change, both in interatomic distance and number of surrounding oxygens, indicates that the borons are partly in triangular and partly in tetrahedral coordination, the fraction in the latter increasing with increase of soda. Six oxygens about each sodium at 2.4A and from five to six oxygens about each oxygen at 2.4A are consistent with the distribution curves. The results can be interpreted in terms of a random network picture of vitreous soda-boric oxide, in which the borons are bonded either to three or four oxygens and the sodium atoms are randomly distributed in holes in the boron-oxygen network. Maxima and minima in the physical properties of glasses containing boric oxide and soda are explained in terms of the ability of the boron atom to change to tetrahedral coordination when some oxide such as Na2O is present to supply the necessary extra oxygen." @default.
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- W2090324681 date "1938-08-01" @default.
- W2090324681 modified "2023-10-10" @default.
- W2090324681 title "X-RAY DIFFRACTION STUDY OF SODA-BORIC OXIDE GLASS *" @default.
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- W2090324681 doi "https://doi.org/10.1111/j.1151-2916.1938.tb15777.x" @default.
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