Dielectric Characterization at High Temperature of Iron Doped Potassium Strontium Niobate Ceramic by Impedance Spectroscopy

Abstract:

Tetragonal Tungsten Bronze structure TTB-type structure has attracted interest by the high anisotropy of the crystal structure. The dielectric characterization of iron-doped niobate of TTB-type structure, with stoichiometry KSr₂(Fe_0.25Nb_4.75)O_15-δ, prepared by Modified Polyol Method was investigated. Nanocrystalline single phase powders were obtained after calcination of the precursor powder at 1150 °C for 10 hours in an oxygen atmosphere. The dielectric characterization was performed by impedance spectroscopy, from room temperature to 600 °C, in the frequency range of 5 Hz to 13 MHz. The permittivity values obtained for KSr₂(Fe_0.25Nb_4.75)O_15-δ showed superior to the permittivity values of the KSr₂Nb₅O₁₅ host structure in all temperature range investigated. At room temperature, the permittivity values (2100) of KSr₂(Fe_0.25Nb_4.75)O_15-δ is two times the permittivity values of KSr₂Nb₅O₁₅. The substitution of niobium cation by iron cation in the KSr₂Nb₅O₁₅ host structure showed a suppression of the ferroelectric (P4bm) → paraelectric (P4/mbm) phase transition.

• Periodical: Materials Science Forum (Volume 820)
• Pages: 187-192
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.820.187
• Online since: June 2015
• Authors: Caio Vinicius de Lima*, Marcos Augusto Lima Nobre, Silvania Lanfredi
• Keywords: Dielectric Properties, Impedance Spectroscopy, Niobate, Tetragonal Tungsten Bronze Structure

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