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Dielectric Properties of Gel-Calcined Cd-Zn Oxide Nanocomposites
A. De1, S. Kundu2
1 Department of Chemistry, Krishnath College, Berhampore, Murshidabad, West Bengal – 742101, India
2 Sensor & Actuator Division, Central Glass & Ceramic Research Institute, 196, Raja S. C. Mullick Road, Kolkata – 700032, India
received Febuary 8, 2017, received in revised form May 26, 2017, accepted July 8, 2017
Vol. 8, No. 4, Pages 463-470 DOI: 10.4416/JCST2017-00008
Abstract
Cd-Zn oxide nanocomposites have been synthesized with a novel yet simple sol-gel technique. Zn(NO3)2·6H2O and Cd(NO3)2·4H2O were used as starting materials and the concentration of Cd was varied as follows: 5, 10, 15 and 20 atom%. Gels were calcined at 500 °C for 2 h to obtain nanocomposite. Thermogravimetric analysis was applied to monitor the process. XRD analysis revealed the presence of polycrystalline phases of hexagonal wurtzite ZnO and cubic CdO. FESEM, TEM studies indicated development of nanocomposites of nearly spherical shapes. The high dielectric constant values of the nanocomposites at low frequencies were observed owing to space charge polarization and field-induced rotation polarization. Maximum polarization effect and AC conductivity owing to the presence of maximum defect centres in 20 atom%-Cd-containing nanocomposite could be identified.
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Keywords
Sol-gel, nanocomposite, dielectric properties
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