Download A First Book of Metaphysics by Walter Taylor Marvin PDF

By Walter Taylor Marvin

Writer: ny, Macmillan ebook date: 1912 matters: Philosophy, American -- twentieth century Notes: this can be an OCR reprint. there is typos or lacking textual content. There are not any illustrations or indexes. should you purchase the overall Books variation of this ebook you get unfastened trial entry to the place you could make a choice from greater than one million books at no cost. it's also possible to preview the publication there.

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833 μηι). 70 μηι), as shown in Fig. 21. 71 μιη). All of the above studies on Ti3 + indicated octahedral symmetry of the oxygen ions clustered about the central ion, but with some tetragonal distortion apparent. 39 OPTICAL ABSORPTION OF GLASSES 1,500 lO 1,000 I I 1 700 1 600 500 "Ί 400 1 2 1 300 π\μ ~~J1 I 1 Charge transfer band r3 10 GO 2 5 r\ As 0 6,000 \S 10,000 1 / 14,000 1 18,000 1 i 1 1 1 1 1 \ 1 22,000 l^fe· - * ' 26,000 / / 1 30,000 1 34,000 38,000 cm - 1 Fig. 21. 70 μπι (14,300 c m - 1 ) .

A. Absorption of Impurities in Oxide Glasses Impurities may enter into the glass structure in a variety of positions. For example in a silicate glass, the possibilities generally fall into three major categories: (1) a network-modifying cation position surrounded by six or more oxygens, (2) a network-forming cation position with four-fold oxygen coordination, replacing Si 4 + , and (3) a network-forming anion position, replacing an oxygen. Some impurities can enter the glass network in more than one position, in different valence states as well as with different oxygen coordination numbers.

Break in curve at 15 mole % N a 2 0 does not correspond to any known structural change in the glass. ) glasses are expected to exhibit substantially higher uv transmission than their silicate counterparts. The electronic absorption does not appear to be sensitive to the large scale changes in ring structures taking place in borate glasses but most likely depends on the excitation of electrons from B-O and M - O bonds. C. Phosphate Glasses Phosphate glasses also tend to exhibit excellent uv transmission, and find applications in this regard.

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