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The vaporization and thermochemical stability of lithium aluminates

1981; Elsevier BV; Volume: 97; Issue: 1-2 Linguagem: Inglês

10.1016/0022-3115(81)90417-7

1873-4820

Yasushi Ikeda, Hiroyuki Ito, G. Matsumoto, Hiroshi Hayashi,

Thermal Expansion and Ionic Conductivity

The vaporization and thermal stability of various lithium aluminates were investigated by high temperature mass spectrometry. The decomposition reactions of them were determined as follows: Li5AlO4(c, 1 = 2.22 Li(g) + 0.02 LiO(g) + 0.88 Li2O(g) + 0.56 O2 + γ-LiAlO2(c), LiAlO2(c, 1) = 0.78 Li(g) + 0.008 LiO(g) + 0.008 Li2O(g) + 0.19 O2 + 0.2 LiAl5O2(c), LiAl5O8(c) = 0.998 Li(g) + 0.002 LiO(g) + 0.250 O2 + 2.500 Al2O3(c). The enthalpy of the reaction for Li5AlO4 was 1413 ± 40 kJmol, and those for LiAlO2 and LiAl5O4 were 399 ± 12 and 531 ± 50 kJmol, respectively. The heats of formation of these lithium aluminates are in agreement with those of previous work.