X‐ray Diffraction Study of Soda‐boric Oxide Glass *

Biscoe, J.; Warren, Β. E.

doi:10.1111/j.1151-2916.1938.tb15777.x

Cited by 203 publications

(57 citation statements)

References 4 publications

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“…This method has been applied to several soda-silicate glasses [4], to potash silicate glasses [5], and to some soda silicate glasses containing lime [6]. Such work has been done, also, on some simple borate glasses [7], and phosphate glasses [8].…”

Section: Differential Diffraction Patternsmentioning

confidence: 99%

Role of vitrons in alkali silicate binary glasses

Tilton¹

1958

J. RES. NATL. BUR. STAN.

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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 slop e on t he property-composition curves m ay occ ur where t h ere are integral numbers of cation s p er dodecah edral 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 h an 1 oxyge n a nd 4 potassiums can be inclosed in a cage.Data on ch emi cal attack and on solubility losses in water s ugges t for alkali s ilicate glasses a maximal a verage inclos u re of oxygen inside t he cavit ies at 16.7-mole p ercen t for K 20 , 23. 1 percen t for Na20, and probably 28.6 p ercent 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 in g oxygen. C hanges 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, res pectively. These crit ical co mposit ions are cons id ered t hose for which t he cavit ies in t he p;lasses are com p letely saturated wit h the modifi er oxides, R,O, and with additional cations, R .D etail ed analyses of cur ves of molar volume versus co mposition show th a t the critical points for oxide saturatio n arc evide nt and that ch a nges 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 h e percentage of 16.7-percent N a 20 at hi gh temperatures and the sat ura t ion point of 37.5 perce n t at low temperatures are cri t ical in curves for specific (electri cal) resistance. The "deep-well " point at 16.7-perce n t Na20 critically separat es soda sili cate glasses t hat are very rea dily devitri fi ecl from those t hat contain more oxide modifi er a nd are more stable.

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Section: Differential Diffraction Patternsmentioning

confidence: 99%

Role of vitrons in alkali silicate binary glasses

Tilton¹

1958

J. RES. NATL. BUR. STAN.

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“…Shartsis, Capps, and Spinner [47] re mark , from other co nsiderations, that " the glass should act as if it were under pressure." Biscoe and Warre n [46] reported that the (B-O) distan ce first de creased and then increased progressively from 1.37 to 1. 48 A as modifier content of Na20 in B20 3 was in creased from 10 to 31 mole percent, and that the coordination of boron 8 also increased.…”

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confidence: 99%

Relation of vitron theory to 2-layer-liquid immiscibility in binary silicate and borate glass melts

Tilton¹

1973

J. RES. NATL. BUR. STAN. SECT. A.

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(AUgU5t I, 1972) Silica-rich and boron-rich binary glasses resemble c1athrates in having host cavities in which modifier ox ides may be in clos ed with out stress as inactive gues ts until the cavities are approximately fill ed. Additional modification results in stress both in th e holes of the matrix and the cavities of vitrons. Then the structur e begin s to di sintegrate and mixin g tak es place. The r equired mol e-perce nt modification is expressed by an equation of the form lOOr.100where II and a are the diame te rs of vitron cavity and matri x hole, res pective ly, L is th e lin ea r exte nt of a modifier, and q the proportion of glass-maker that forms vitrons. Computations for 66 glasses have bee n mad e to constitute a unified system covering approximate ly the gamut of typical modifiers.The identity of parameters A and a for silicates and borates leads to the suggestion that the vitron structure in boric-oxide glass is th e regular icosah edron of 20 tria ngular fa ces to accommodate a neutral molec ule of (B.O.).. Regular octahednl of (B.O.)., if present in the matrix, would provide matrix holes of approximately a in diameter.

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“…The B-0 bond length was considerably increased as adding more alkali oxides in borate glasses (19), while the Si-0 bond length was less affected by addition of alkali oxides (92) .…”

Section: -Lmentioning

confidence: 88%

“…The effectiveness of soda content on the absorption spectra was less for the silicate glasses (as shown in Figure 39h) than for the borate glasses, because there is less structural change in sodium silicate glasses with higher al kali content (41). The B-0 band length will be considerably increased by adding more soda to borate glasses (19), while the Si-0 band length is less affected by addition of sodium oxide (92) . '…”

Section: +mentioning

confidence: 99%

“…This might be due to no significant change of Si-0 bond length, 1.62 A, with increasing the alkali content (19) and accordingly almost uniform molecular vibra tions (and a constant d-p orbital mixing) during the transi tions (26). If the d-p orbital mixing is increased with more alkali oxide, the regular octahedral environment will be disrupted and changed to tetrahedral or square planer (82,84) .…”

Section: +mentioning

confidence: 99%

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Absorption spectra of transition metal ions in glasses as functions of oxygen pressure, temperature, and composition

Yoon

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X‐ray Diffraction Study of Soda‐boric Oxide Glass *

Cited by 203 publications

References 4 publications

Role of vitrons in alkali silicate binary glasses

Role of vitrons in alkali silicate binary glasses

Relation of vitron theory to 2-layer-liquid immiscibility in binary silicate and borate glass melts

Absorption spectra of transition metal ions in glasses as functions of oxygen pressure, temperature, and composition

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