Enhancement of electrical conductivity and dielectric constant in Sn-doped nanocrystlline CoFe2O4

• Published in: Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology Vol. 15; no. 6
• Main Authors: Rahman, Atta ur, Rafiq, Muhammad Aftab, Hasan, Masood ul, Khan, Maaz, Karim, Shafqat, Cho, Sung Oh
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.06.2013; Springer
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport in multilayers, nanoscale materials and structures; Exact sciences and technology; Inorganic Chemistry; Lasers; Materials Science; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Nanotechnology; Optical Devices; Optics; Photonics; Physical Chemistry; Physics; Research Paper; Ferrites; Conductivity; Polarization; Dielectric; Coprecipitation; Grain boundaries; Particle size; Crystal defects; Frequency dependence; Electrical conductivity; Chemical precipitation; Chemical method; Doping; Cobalt; Nanoparticles; Tin additions; Spinels; Capacitance; Permittivity; Nanostructured materials
• ISSN: 1388-0764; 1572-896X
• DOI: 10.1007/s11051-013-1703-5

We have investigated the dielectric constant and capacitance of pure and tin-doped cobalt ferrite nanoparticles. The nanoparticles with spinel structure were synthesized by chemical co-precipitation method. The average particle size of the samples was 20 ± 2 nm. Room temperature impedance spectroscopy of the nanoparticles was performed in the frequency range of 100 Hz–2 MHz. The conductivity and dielectric response of the nanoparticles were found to increase with tin doping (20 % by atoms) in cobalt ferrite nanoparticles. The observed value of high-dielectric response at low frequencies has been attributed to the presence of grain boundaries in these nanoparticles.