Effect of Varying Calcium Concentration on Dielectric Properties of Calcium Substituted Strontium M-Type Hexaferrites

Abstract:

Calcium substituted strontium M-Type hexaferrites are synthesized at different calcium concentrations by co-precipitation method. During synthesis process, PH value of 11 is achieved and solution is heated at 70 °C for 3 hours to form gel followed by drying process at 80 °C for 5 hours. Synthesized samples are then sintered at 650 °C for 4 hours at ramp rate of 10 °C/min. XRD analysis reveals that strontium M-Type hexaferrites at all calcium concentrations exhibit single phase hexagonal crystal structure. Change in density is observed for samples sintered at 800 °C as compared to samples sintered at 650 °C due to increase in temperature. SEM shows that the average particle size of strontium M-Type hexaferrites is greater at lower calcium concentration and smaller at higher concentrations. The average particle size varies from 530 nm to 345 nm for different calcium concentrations and fine particle sizes are achieved at all calcium concentrations. EDX results indicate that stoichiometric ratio is properly maintained according to samples composition and no extra peak of impurity or other element is detected in EDX spectrum. According to LCR measurement, pure strontium M-Type hexaferrites exhibit high dielectric constant at lower frequencies as compared to calcium substituted M-Type hexaferrites at different concentrations. Pure strontium M-Type hexaferrites have higher conductivity which might be due to presence of extra Fe³⁺ ions at crystal lattice sites. At lower frequencies pure strontium M-Type hexaferrites have higher conductivity and higher tangent loss at lower frequencies as compared to calcium substituted M-Type hexaferrites. While in the frequency range of 200 Hz to 300 Hz calcium substituted M-Type hexaferrites exhibit higher tangent loss.

• Periodical: Solid State Phenomena (Volume 366)
• Pages: 39-46
• DOI: https://doi.org/10.4028/p-NU9ACu
• Online since: December 2024
• Authors: Sana Taimoor, Noor Ali, Saad Saud Ali Shah*, Zeeshan Habib, Nasir Mehboob, Fazal Ur Rehman
• Keywords: Co-Precipitation, Magnetic Materials, M-Type Hexaferrites, Nanoparticles

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