Инд. авторы:	Kuryaeva R.G.
Заглавие:	The state of magnesium in silicate glasses and melts
Библ. ссылка:	Kuryaeva R.G. The state of magnesium in silicate glasses and melts // Glass Physics and Chemistry. - 2009. - Vol.35. - Iss. 4. - P.378-383. - ISSN 1087-6596. - EISSN 1608-313X.
Внешние системы:	DOI: 10.1134/S1087659609040051; SCOPUS: 2-s2.0-69949094633;
Реферат:	eng: The properties of silicate glasses and melts containing magnesium are analyzed in comparison with the properties of glasses and melts in which magnesium is replaced by aluminum. In particular, the properties of the glass and the melt of the diopside composition CaMgSi2O6 are analyzed in comparison with the properties of the glass and the melt of the anorthite composition CaAl2Si2O8. It is demonstrated that the properties of aluminosilicate and magnesium silicate glasses and melts differ not so strongly as should be expected upon replacement of modifier ions by network-former ions. By using the parameters γ n characterizing the cation field strength, it is shown that Mg 2+ cations can fulfill both the function of network formers like Al3+ cations and the function of modifiers like Ca2+ cations. The degree of depolymerization of the glass and the melt of the composition CaMgSi2O6 is estimated to be 0.4-0.5 from the dependences of the change in the relative density (d - d 0)/d at different pressures on the degree of depolymerization NBO/T (the ratio of the number of nonbridging oxygen atoms to the number of network-former cations) for silicate glasses and the dependence of the isothermal bulk modulus K t on the quantity NBO/T for silicate melts. © 2009 Pleiades Publishing, Ltd.
Ключевые слова:	Sugar (sucrose); Silicate minerals; Positive ions; Oxygen; Magnesium; Calcium; Aluminosilicates; Alumina; Glass; Silicate glass; Relative density; Non-bridging oxygen atoms; Modifier ions; Magnesium silicates; Isothermal bulk modulus; Degree of depolymerization; Cation field strengths; Silicate melts;
Издано:	2009
Физ. характеристика:	с.378-383