The LiFe1/2Mn1/2VO4 was prepared by a standard solid-state reaction route. X-ray diffraction (XRD) study confirms the formation of the material under reported conditions and it reveals an orthorhombic unit cell structure with lattice parameter: a=3.71 11 angstrom, b= 15.6568 angstrom, c= 16.3478 angstrom. Complex impedance analysis of the sample indicates: (i) bulk contribution to electrical properties up to 125 degrees C, (ii) grain boundary effects for all T >= 130 degrees C, (iii) negative temperature coefficient of resistance (NTCR) effect and (iv) evidence of temperature dependent electrical relaxation phenomena in the material. D.c. conductivity (sigma(dc)) shows typical Arrhenius behavior when observed as a function of temperature. The activation energy values were estimated to be similar to 0.53 eV (25-175 degrees C) and -0.73 eV (175-475 degrees C) from temperature variation of d.c. conductivity. Modulus analysis has been carried out to understand the mechanism of electrical transport process and this indicates non-Debye type conductivity relaxation in the material. (c) 2007 Elsevier B.V. All rights reserved.