The thermal stability of stoichiometric spinel phases in the system Li
1+deltaMn2-deltaO4 (0 less than or equal to delta less than or equal t
o 0.33) has been investigated by high-temperature powder X-ray diffrac
tion, differential thermal analysis, and thermogravimetric analysis. A
t elevated temperatures, the lithium-manganese-oxide spinels undergo p
hase changes by loss of oxygen and lithia (Li2O). The data highlight t
he importance of temperature control when synthesising lithium-mangane
se-oxide spinel compounds.