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Thermochemistry of Charge‐Coupled Substitutions in Silicate Glasses: The Systems M l/ n n + AlO 2 ‐SiO 2 (M = Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Pb)
Author(s) -
ROY BIMALENDU N.,
NAVROTSKY ALEXANDRA
Publication year - 1984
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1984.tb19603.x
Subject(s) - thermochemistry , enthalpy , aluminosilicate , ionic bonding , silicate , nepheline , chemistry , silicate glass , calorimetry , mineralogy , standard enthalpy of formation , analytical chemistry (journal) , inorganic chemistry , crystallography , materials science , ion , thermodynamics , biochemistry , physics , organic chemistry , chromatography , catalysis
Enthalpies of solution of framework aluminosilicate glasses x M l/ n n + AlO 2 ‐(1‐ x )SiO 2 (M = Cs, Rb, K, Na, Li, Ba, Pb, Sr, Ca, Mg) in molten 2PbO.B 2 O 3 near 973 K were measured. The sequence above represents increasing ability of the nonframework cation M to bond to the bridging oxygen. In that sequence, the enthalpy of the substitution Si 4+ →+ Al 3+ + 1/ n M n + in the glass becomes less exothermic, the enthalpy of vitrification increases, and the tendency toward glass‐glass immiscibility becomes more pronounced. These parameters correlate smoothly with the ionic potential, z/r , of the substituting cation.