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http://dx.doi.org/10.3740/MRSK.2005.15.12.786

Composition and Temperature Dependence of Structural Changes in Borosilicate Glasses by Spectrometer  

Park Sung-Je (School of Materials Science and Engineering, Pusan National University)
Ryu Bong-Ki (School of Materials Science and Engineering, Pusan National University)
Publication Information
Korean Journal of Materials Research / v.15, no.12, 2005 , pp. 786-790 More about this Journal
Abstract
We investigated the particularity of temperature and composition changes in $xNa_2O{\cdot}(52.5-x)B_2O_3{\cdot}47.5SiO_2$ glasses by use of FT-IR, $^{11}B$ NMR, Raman spectrometer. From FT-IR and $^{11}B$ NMR spectrometer, we thought that tetrahedral boron, $BO_4$ units are created $N_4$ increasing tendency generated near $600^{\circ}C$. It's expected that composition ana heat treatment directly contributed to structural changes, this changes are following to $Na_2O$ increasing or decreasing. caused by $N_4\;and\;BO_4$ units are caused by relatively increasing or decreasing in the glasses' structure. Particularly, $BO_4$ units are converted to $BO_3$ units after $600^{\circ}C$ heat treatment for 50h in the composition of $x<18(R<0.5,\;R=Na_2O/B_2O_3\;mol\%)$. On the order hand, $BO_3$ units are converted to, $BO_4$ units after $600^{\circ}C$ heat treatment for 50h in the composition of $x{\geq}18\;(R>0.5)$. This particularity of composition and temperature dependence of structural changes are similarly represented by Raman analysis results.
Keywords
composition and temperature dependence; borosilicate glass; IR; NMR; Raman;
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