Preparation of AFeO2 (A = Li, Na) by hydrothermal method

Lithium ferrites (LiFeO 2 , LiFe 5 O 8 ) and sodium ferrite (NaFeO 2 ) were prepared at low temperature (130-220°C) by hydrothermal treatment of Fe(III) compounds (FeOOH, FeCl 3 . 6H 2 O, Fe(NO 3 ) 3 . 9H 2 O and Fe 2 (SO 4 ) 3 . nH 2 O) with a large excess of LiOH and NaOH, respectively. One of possible polymorphic LiFeO 2 with superlattice of β-LiFeO 2 are obtained by a low temperature (350°C) heat treatment of the hydrothermally obtained α-LiFeO 2 with a small quantity of β-LiFeO 2 .