The mechanism of formation of lithium nickel oxide phases by solid sta
te reaction of Ni and Li2CO3 in the temperature range 700-800 degrees
C was investigated. Cubic LixN1-xO solid solution with nominal composi
tion x=0.30 was obtained throug the formation of hexagonal LixNi1-xO,
However, hexagonal LixN1-xO with x=0.44 arose from cubic LixNi1-xO. To
explain this behaviour, the existence of an equilibrium relationship
between cubic disordered and hexagonal ordered LixN1-xO phases is prop
osed.