Structural and Dielectrical Properties of Mn0 2 -V20 5 -Sn0 Mixed Oxides System at 1023 Κ Ε. Tarcan*, U. Kadiroglu**, Y. Atalay*** and K. Esmer*, + *Kocaeli University, Faculty of Science and Arts, Department of Physics, Umuttepe Campus, 41380 Kocaeli, Turkey Kocaeli University, Faculty of Science and Arts, Department of Chemistry, Umuttepe Campus, 41380 Kocaeli, Turkey ***Sakarya University, Faculty of Science and Arts, Department of Physics, Esentepe Campus, 54187 Sakarya, Turkey (Received July 28, 2008: final form August 18, 2008) ABSTRACT The different concentrations of the composites were prepared by mixing the 80 mass % of the base material Mn0 2 with 10 mass % V 2 O s and 10 mass % SnO (sample A), and with 15 mass % V 2 0 5 and 5 mass % SnO (sample B), respectively. The composite materials were examined using Fourier Transform Infrared (FT1R), X-Ray Diffraction (XRD), ac impedance and dc techniques. The XRD and FTIR numbers show the composites consist of the mixture of different phases, Mn 2 V20 7 , Mn 2 0 3 and Sn0 2 . During reaction at high temperature, it is found that tin (II) oxidizes to tin (IV) and Μη (IV) reduces to Mn (111). The conductivities of the composites were found to be within the semi- conducting region (~3.67xl0' 7 S cm' 1 (xlO 2 S m' 1 ) for sample A and ~7.33xl0' 7 S cm"' (xlO 2 S m' 1 ) for sample B). The dielectric constants were calculated to be 59 for sample A and 36 for sample B, at -100 Hz, respectively. Keywords:Keywords: Mn0 2 ; V 2 O s ; composite material; XRD; dielectric; conductivity. + Corresponding Author: Kadir Esmer E-mail: kadiresmer@kocaeli.edu.tr 1. INTRODUCTION Materials containing manganese /1, 2/, tin 131 and vanadium /4, 5/ oxides have been extensively studied due to their widespread applications in solid-state electrochemical devices, such as solid state batteries etc. In particular, manganese oxide (Mn0 2 ) has been considered as a potential cathodic electrode and as a host material for lithium ions in the lithium batteries l\l. Vanadium oxide (V 2 0 5 ) has been used as an intercalation host because of its V0 6 octahedral arranged and may be irregular within structure with five V-O different crystallographic directions 161. Tetragonal tin (II) oxide (SnO) is also investigated widely in order to use an anode material in solid-state batteries and an electrical conductor 111. Many studies showed that in the presence of air SnO oxidizes to rutile Sn0 2 at temperatures above 873 Κ (600 °C) /8/. This transformation can affect the conductivity of the SnO doped material. While many studies have been concentrated on mixed oxide systems at various concentrations /9-13/, a 141 Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 6/1/15 7:31 PM