Study of dielectric relaxations in co-precipitated Sr–Fe(Cr) nanoferrites

Journal of Materials Science: Materials in Electronics - Tập 26 - Trang 6539-6545 - 2015
M. Anis-ur-Rehman1, Fatima-tuz-Zahra1, Seemab Kanwal1, Zeenat Khan1, Anila Asif2, Anam Noor Hussain2, Saba Zahid2
1Applied Thermal Physics Laboratory, Department of Physics, COMSATS Institute of Information Technology, Islamabad, Pakistan
2Interdisciplinary Research Centre in Biomedical Materials, COMSATS Institute of Information Technology, Lahore, Pakistan

Tóm tắt

Chromium (Cr) doped strontium hexaferrites with nominal composition SrFe12−xCrxO19 (x = 0.0, 0.1, 0.2, 0.3) were prepared using co-precipitation method. Thermal analysis of the samples was carried out using thermogravimetric analysis and differential scanning calorimetry to study the thermal stability as well as the transitions within the samples with variation in temperature. Structural analysis of the samples was carried out using X-ray diffraction (XRD). XRD revealed that all the samples possess hexagonal structure with space group P63/mmc. AC electrical properties including dielectric constant (έ), dielectric loss tangent (tan δ) and ac electrical conductivity (σ ac ) were studied as a function of frequency (1 kHz–3 MHz) at temperatures 100–700 °C. The dielectric losses tend to decrease with increasing Cr content. AC conductivity could be very well explained by Jonscher power law. These materials have applications in high frequency devices with reduced energy losses.

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Thông tin xuất bản

Journal of Materials Science: Materials in Electronics

Tập 26

6539-6545

Thông tin tác giả