The thermochemical stability, crystallographic structures and physical properties of (
LnAO
3)
nLnABO
4 [
n=0, 1, 2, …,
Ln : Y, Ho, Er, Tm, Yb, Lu, In and Sc, A : Fe, Ga and Al, B : Mg, Mn, Fe, Co, Cu, Zn and Cd] compounds were reviewed. The phase diagrams of the R
2O
3-Fe
2O
3-Fe systems [R: Y and Yb], the In
2O
3-Ga
2O
3-CuO system and the In
2O
3-Fe
2O
3-CoO system at elevated temperatures were illustrated and the stability of the layered compounds was summarized. The crystal structures of YbFe
2O
4 and Yb
2Fe
3O
7 were presented and the relations between the structures and the constituent divalent or trivalent cation were crystal-chemically discussed. The phase transformation in the stoichiometric YFe
2O
4 compound whichmay belong to that of Verwey type, was discussed based upon the data of electrical conductivity, Mössbauer spectra and specific heat measurement, [J. Cryst. Soc. Jpn.
26,
334 (1984) ] .
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