Polycrystalline samples of mixed ferrite Li0.6Co0.1DyxFe2.3-xO4; 0.0less than or equal toxless than or equal to0.2 were prepared by the standard ceramic technique. X-ray diffraction analysis was carried out to assure the formation of the samples. The resistance was measured at different temperatures (300-800 K) as a function of frequency (200 kHz-5 MHz) for the investigated samples prepared at different sintering temperatures (1100degreesCless than or equal toT(s)less than or equal to1250degreesC). It is found that this type of rare earth ferrite gives a distinguishable behavior at T-s=1200degreesC where the resistance of the samples at room temperature reduced to approximate to90% of their values of the others sintering temperatures. The data showed also that the resistance of these samples sintered at 1100degreesC is changed at 100 kHz from 12 MOmega without applying pressure to 19 kOmega with 0.8 MPa. This change occurs in a reversible manner (i.e., after removing the mechanical pressure effect the resistance of the samples well return to their initial values again immediately). Thus this type of rare earth ferrite could be more applicable in several advanced electronic devices and can be used as a sensor for the mechanical pressure. (C) 2004 Kluwer Academic Publishers.