Dielectric and electrical studies of Li-Ti mixed nanoferrites R.M.Sangshetti 1 , V.A.Hiremath 2 , V.M.Jali 3* 1 Department of Physics, P.D.A. College of Engineering, Gulbarga  585 102, (INDIA) 2 Department of Chemistry, P.D.A. College of Engineering, Gulbarga  585 102, (INDIA) 3 Department of Physics, Gulbarga University, Gulbarga  585 106, (INDIA) E-mail : vmjali@gmail.com Received: 30 th October, 2011 ; Accepted: 30 th November, 2011 Full Paper Li-Ti mixed ferrites; N-type conductivity; Dielectric and electrical anomalies. KEYWORDS ABSTRACT The polycrystalline samples of the Li-Ti mixed nanoferrites, Li 0.5+0.5x Ti x Fe 2.5- 1.5x O 4 , (0.02 = x = 0.1) were prepared by combustion method. The IR spectra in the range 400  800 cm -1 were recorded at room temperature. Thermoelec- tric power measurement shows n-type conductivity. Dielectric constant and loss values increase with increase in temperature and decreases with in- crease in frequency. Two relaxations were observed in the temperature de- pendence of tan. The activation energy required for the relaxation was calculated from the conductivity data. These relaxations were attributed to the electron hopping between Fe 2+ and Fe 3+ ions on octahedral sites and the creation of oxygen defects.  2012 Trade Science Inc. - INDIA INTRODUCTION Lithium ferrites have become very attractive in mi- crowave application and also as replacement for gar- nets and other spinel ferrites because of their good remnance and squareness ratio along with the highest T c among spinel ferrites [1] . Jefferson and West [2, 3] have reported that Ti 4+ substitution as a replacement for iron in lithium ferrite enhances its physical properties by re- ducing saturation magnetization values. The incorpora- tion of titanium into lithium ferrite necessitates the ad- justment of both monovalent lithium and trivalent iron ions. Many recent researchers [4-6] have studied IR ab- sorption spectra of some mixed ferrites. The results from IR study can be used to interpret the electrical and magnetic properties [7] . Polycrystalline Li-Ti mixed ferrites are supposed to be good dielectric materials. More- over, the dielectric properties of ferrites are dependent on several factors including the method of preparation [8] , the sintering temperature [9] and the sintering atmo- sphere [10] . Several studies have been reported on di- electric [11, 12] and thermoelectric [13, 14] properties of Li- Ti mixed ferrites. However, nanoscale ferrites have shown anomalous dielectric behavior [15] . In the present investigation, the electrical properties such as thermo- electric, electrical and dielectric measurements carried out for Li-Ti mixed nanoferrites at different tempera- tures are reported. EXPERIMENTAL Polycrystalline samples of Li-Ti mixed nanoferrites Li 0.5+0.5x Ti x Fe 2.5-1.5x O 4 (0.02 = x = 0.1) were prepared by combustion method. The details of the method of Materials Science MSAIJ, 8(4), 2012 [155-161] An Indian Journal Trade Science Inc. Volume 8 Issue 4 Materials Science ISSN : 0974 - 7486