The effect of Fe substitution on magnetic and transport properties of LaMnO

Single phases of LaMn 1 - x Fe x O 3 ( 0 ⩽ x ⩽ 0.60 ) have been prepared by using chemical route to study the effect of Fe substitution on magnetic and transport properties of LaMnO 3 . Slightly non-stoichiometric oxygen concentration is expected for these samples. Mossbauer study indicates that Fe in these compounds is in the trivalent high-spin state. The absolute value of the resistivity decreases initially at x = 0.15 and then increases rapidly with the further increase of x. The temperature dependence, ρ ( T ) , is semiconducting for all the compounds and explained well by the variable range hopping rather than the adiabatic small polaron hopping. The compounds with x ⩽ 0.15 show ferromagnetic characters while those for x = 0.30 and ⩾ 0.50 exhibit typical cluster glass-like and complicated glassy features, respectively.