Giant Dielectric Permittivity and Weak Ferromagnetic Properties in (1-x)LaFeO3-(x)BaTiO3 (x=0.00, 0.05) Ceramic T. Sreenivasu1, K.Chandra Mouli1, K.Prabahar3Y.Ramesh Babu4 and Patri Tirupathi2* 1 Department of Engineering Physics, Andhra University College of Engineering, Visakhapatam-530003, India. 2 Department of Physics, Rajiv Gandhi Universities of Knowledge Technologies, RK Valley-516329, India. 3 Advanced Magnetic group, Defense Metallurgical Research Laboratory, Hyderabad - 500058, India. 4 Department of Physics, G.Pulla Reddy College of Engineering, Kurnoo- 518007,India. * Corresponding author’s e-mail: [email protected], Tel.: +91-8332872902; Fax: +040 – 23001830 Abstract The multiferroic (1-x)LaFeO3-xBaTiO3 (x=0.0,0.05) ceramics were synthesized by solid-state reaction method. Rietveld refined XRD clearly shows orthorhombic phase with Pbnm space group. The giant dielectric permittivities were noted. In addition, dielectric loss relaxation was reported which can be ascribed to polaranic conduction. Enhanced properties with weak ferromagnetic nature and positive MD effect also noted for x=0.05. Keywords: Multiferroic, Magneto-Dielectric, Ceramic. Introduction Multiferroic ceramics are characterized by simultaneous presence of two or more ferroic order parameters and coupled via magnetoelectric interaction [1,2]. Recently, these materials has received considerable attention in novel device applications due to extra degree of freedom between order parameters i.e., magnetic polarizations using electric field or vice versa . Amongst the few room temperature multiferroics, LaFeO3 is most prominence and its solid solutions are also widely studied ME systems. LaFeO3, at room temperature, has orthorhombic unit cell with Pbnm space group. It containing only trivalent iron and exhibiting a high value of the Neel temperature (T N -740 K) and ferroelectric transition at 830°C [2-4]. Various strategies are being investigated to improve enhance the ME performance of LaFeO3 at room temperature. Amongst these, synthesis of solid solution with strong ferroelectric materials is also most acceptable. In this paper, we report the synthesis (1x)LaFeO3-(x)BaTiO3 (x=0.00, 0.05) solid solution, along with enhanced dielectric and magneto-dielectric properties. Experimental The samples are prepared using standard ceramic synthesis route. These powders are calcined at 1200°C for 6h and calcinations procedure were repeated for twice to get pure phase of the system. The phase analysis was carried out by X-ray diffraction. Dielectric properties were measured with impedance analyzer HP 4192A with temperature intervals of 100K-350K and 500 Hz-1M Hz frequency range. Magnetic and magneto-dielectric studies also studied using SQUIDVSM magnetometer with field of 6T. Result and Discussion The Rietveld refinement of XRD for these ceramics show the orthorhombic unit cell with Pbnm space group. The micrograph of ceramic show high density, with average grain size was 2-5 μm range. Temperature dependent dielectric permittivity shows giant permittivity value for LaFeO3 and small amount of BaTiO3 doping, shows significant enhancing in giant permittivity values. Along with dielectric loss relaxation, shows the frequency dispersion which can be polaronic conduction. The estimated activation energies Fig .1 M-H loops of (1-x)LaFeO3-xBaTiO3 ceramics (a) x=0.00; (b) x=0.05. Variation of coercivity with temperature of the corresponding ceramics (c) x=0.00; (d) x=0.05. are well agreed with polaronic activation energies. In addition to, temperature dependent M-H loops also shows large magnetic moment with weak ferromagnetic nature. Furthermore, Positive MD effect at room temperature was noted. The details of enhanced magnetic and magneto dielectric properties with suitable explanation will be given in complete paper. References  D. Khomskii, Physics 2, (2009) 20.  S. Acharya, J. Mondal, S. Ghosh, S. K. Roy, and P. K. Chakrabarti, Materials Letters 64, (2010) 415.  C. Chen, K. B. Xu, Y. M. Cui, and C. C. Wang, Materials Letters 89, (2012) 153  A. Singh and R. Chatterjee, Appl. Phys. Lett. 93, (2008) 182908.