English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Appli cations of v it ron t heo ry to analyses of properti es of R 20 s ili cate binary glasses indicate that change in slope on t he property-composition curves may occ ur where t here are integral numbers of cations p er dodecahedral cavity or cage of th e network. From geometrical consid eration s i t is found that 1 or 2 oxygens and 6 sodiums can be accommodated inside a cage, an d similar ly not more t han 1 oxyge n and 4 potassiums can be inclosed in a cage. Data on chemi cal attack and on solubili ty losses in water sugges t for alkali s ilicate glasses a maximal average inclosu re of oxygen inside t he cavit ies at 16.7-mole percen t for K 20 , 23. 1 percen t for Na20, and probably 28.6 percent for Li 20 . T hese composit ions correspon d to 1, 1.5, an d 2 oxyge ns per cage. T hese co mposit ions m ark t he beginning deterioration of the net. poss ibl y because of non bridg ing oxygen. Changes in rate of volatili zation occ ur at 28.6-, 37.5-, a nd 50.0-per cent R ,O for potash , soda, and li t hi a sili cate glasses, respectively. These crit ical composit ions are cons id ered t hose for which the cavit ies in t he p;lasses are comp letely saturated wit h the modifi er oxides, R,O, and with additional cations, R. D etailed analyses of cur ves of molar volume versus co mposition show th a t the critical points for oxide saturation arc evident and that changes in slope may occur at other cri t ical compos ition s corresponding to in tegral numbers of cat ions per cage. It is found that t he percentage of 16.7-percent N a 20 at high temperatures and the satura t ion point of 37.5 percen t at low temperatures are cri t ical in curves for specific (electri cal) resistance. The "deep-well " point at 16.7-percen t Na20 cr it ically separat es soda sili cate glasses t hat are very readily devitri fi ecl from those t hat contain more oxide modifier a nd are more stable.

Role of vitrons in alkali silicate binary glasses