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- W1998764108 abstract "The glasses and crystals of {xM4P2O7+ (1 −x)Zn2P2O7} (M = Li, Na) as well as glasses of thexLi4P2O7· (0.3 −x)Na4P2O7·0.72Zn2P2O7composition were studied by both solution calorimetry at the temperatureT= 298.15 K and high temperature calorimetry (solution calorimetry atT= 973 K, transposed and drop solution calorimetry, and d.s.c.). The binary pyrophosphate glasses depends on the nature of alkali cation and correlates with its electronegativity (exothermic effect of formation decreases from Na to Li). A practically linear composition dependence of enthalpy of formation for the glasses does not contradict the assumption that the structures of the extreme series members are realized in their structure. Inasmusch as the effects of mixing for the ternary pyrophosphate glasses from the series end members (x= 0 andx= 0.3) are weakly exothermic, the existence of the mixed alkali effect is assumed. The effect causes the decrease of theTgvalues. The lowest values are characteristic of the glasses with the mole ration(Na) /{n(NA) +n(LI)} ≃ 0.7." @default.
- W1998764108 created "2016-06-24" @default.
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- W1998764108 date "1996-02-01" @default.
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- W1998764108 title "Enthalpies of formation of vitreous and crystalline pyrophosphates of (lithium oxide or sodium oxide + zinc oxide + phosphorus pentoxide)" @default.
- W1998764108 doi "https://doi.org/10.1006/jcht.1996.0010" @default.
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