INTERNATIONAL RESEARCH JOURNAL OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 VOLUME: 07, SPECIAL ISSUE | JUNE 2020 WWW.IRJET.NET P-ISSN: 2395-0072 International Conference on Recent Trends in Science & Technology-2020 (ICRTST - 2020) Organised by: ATME College of Engineering, Mysuru, INDIA © 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 187 Synthesis, Characterization and DC Conductivity Studies of Samarium activated La2MoO6 Nanocomposites K. R. Bhagya 1 , K. R. Jyothi 2 and N. M. Nagabhushana 3 Department of Physics, Rao Bahadur Y Mahabaleswarappa Engineering College, Ballari, 583104, India H. Nagabhushana 4 Prof. C.N.R. Rao Centre for Advanced Materials Research, Tumkur University, Tumkur, 572103, India Vinayakprasanna N. Hegde 5 Department of Physics, Vidyavardhaka College of Engineering, Mysuru, 570002, India -------------------------------------------------------------------------***------------------------------------------------------------------------ Abstract— The samarium (Sm 3+ ) doped lanthanum oxymolybdate (La2MoO6) nanocomposites (NCs) for a different concentration was prepared by cost effective combustion route mix A.V. gel as a surfactant. The present work reports on the powder X-ray diffraction for the crystallite size of prepared composites and confirms the nanophase. The transmission electron microscope shows bumble-like shaped particles and polycrystalline behavior. The scanning electron microscope shows the agglomerated circular shaped particles. The optical energy band gap was calculated by diffused reflectance spectroscopy. DC electrical properties such as Current-Voltage characteristics and conductivity are studied for different temperatures from 30 to 200 ο C. The present works discuss the basic properties as well as the effect of temperature on the electrical characteristics of La2MoO6: Sm 3+ NCs. Keywords- Samarium; low temperature; PXRD; I-V characteristic; DC conductivity 1. INTRODUCTION Nowadays nanomaterial plays an important role in different fields of electronics. In recent years, the advantages namely superior luminescence efficiency, compatibility with the environment, economically feasible, higher working lifetime, the phosphor converted white light emitting diodes (wLED) are considered as the next generation illumination sources. These wLED can hold back the conventional fluorescent lamps largely dominated in indoor and outdoor lighting, automobile displays and flashlights. Also, tremendous interest has been engaging in rare earth (RE) doped ceramic materials and holds attention owing to a diverse set of applications in opto and solid state electronics [1–5]. Researchers are extensively working on different phosphor materials to find out a suitable candidate for these applications. In this study, we have chosen the RE element samarium as dopant ion. The Samarium with symbol a ‘Sm’ belongs to the lanthanide series of the periodic table whose electronic configuration is [Xe] 4f 5 in its trivalent state. Recently, molybdates have attracted growing interest due to their excellent advantages in solid state electronics owing to its excellent thermal and chemical stability. And also due to the intense oxygen-to-metal (O-Mo) charge transfer bands in the near UV region [6]. Among the various metal, molybdates compound could be a potential host material for the application of wLED’s. The Mo6 groups have superior absorption in the UV region [7, 8]. The La2MoO6 as a host compound has been studied effectively due to its high stability [9-10]. However, reports on the electrical properties of the oxymolybdates are spares. Therefore in this study, the Sm 3+ doped La2MoO6 NCs for different concentrations experimented via fuel based combustion route and characterized by different techniques. The effects of Sm 3+ on the phase structural, morphology, optical band gap and electrical properties of La2MoO6 were addressed. 2. EXPERIMENT The material consists of lanthanum nitrate [La(NO3)3], molybdate oxide [Mo7(NH4)6] and samarium nitrate [Sm(No3)3]. The concerned chemicals are utilized without further purification. The powder samples of Sm 3+ doped La2MoO6 for different doping concentrations (0, 5, 7, 9 and 11 mol%) were prepared by low temperature solution combustion method using A.V. gel. The [La(NO3)3], [Mo7(NH4)6] and [Sm(No3)3] are taken in the desired stoichiometric ratio with 15 ml of A.V. gel as a surfactant were homogeneously mixed under the magnetic stirrer for 10 min. Then mixtures were heated to 450 o C in a muffle furnace and allowed to cool slowly. Later, it is fired at 800 ο C for 8 h, resultant powder of white color was obtained and characterized by the different techniques. Therefore the obtained product was utilized for various characterizations. The powder sample was characterized by powder X-ray diffraction (PXRD), with Rigaku Altima (IV) with Cu Kα (1.541Å) radiations were collected over the 2θ range from 20 ο to 60 ο . Transmission electron microscope (TEM) images are recorded by JEOL JEM-2100. Scanning electron microscope (SEM) images of