中国物理B ›› 2019, Vol. 28 ›› Issue (8): 88701-088701.doi: 10.1088/1674-1056/28/8/088701

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Effects of bismuth on structural and dielectric properties of cobalt-cadmium spinel ferrites fabricated via micro-emulsion route

Furhaj Ahmed Sheikh, Muhammad Khalid, Muhammad Shahzad Shifa, H M Noor ul Huda Khan Asghar, Sameen Aslam, Ayesha Perveen, Jalil ur Rehman, Muhammad Azhar Khan, Zaheer Abbas Gilani   

  1. 1 Department of Physics, Balochistan University of Information Technology, Engineering & Management Sciences, Quetta 87300, Pakistan;
    2 Department of Physics, Government College University, Faisalabad 38000, Pakistan;
    3 Department of Physics, The Islamia University of Bahawalpur 63100, Pakistan
  • 收稿日期:2019-03-22 修回日期:2019-06-12 出版日期:2019-08-05 发布日期:2019-08-05
  • 通讯作者: Zaheer Abbas Gilani E-mail:zagilani2002@yahoo.com,zaheer.abbas@buitms.edu.pk

Effects of bismuth on structural and dielectric properties of cobalt-cadmium spinel ferrites fabricated via micro-emulsion route

Furhaj Ahmed Sheikh1, Muhammad Khalid1, Muhammad Shahzad Shifa2, H M Noor ul Huda Khan Asghar1, Sameen Aslam1, Ayesha Perveen1, Jalil ur Rehman1, Muhammad Azhar Khan3, Zaheer Abbas Gilani1   

  1. 1 Department of Physics, Balochistan University of Information Technology, Engineering & Management Sciences, Quetta 87300, Pakistan;
    2 Department of Physics, Government College University, Faisalabad 38000, Pakistan;
    3 Department of Physics, The Islamia University of Bahawalpur 63100, Pakistan
  • Received:2019-03-22 Revised:2019-06-12 Online:2019-08-05 Published:2019-08-05
  • Contact: Zaheer Abbas Gilani E-mail:zagilani2002@yahoo.com,zaheer.abbas@buitms.edu.pk

摘要: Spinel ferrites have a significant role in high-tech applications. In the present work nano-crystalline ferrites having general formula Co0.5Cd0.5BixFe2-xO4 with (x=0.0, 0.05, 0.1, 0.15, 0.2, and 0.25) are synthesized via micro-emulsion route. Powder x-ray diffraction (XRD) studies discover the FCC spinel structure. Crystalline size is calculated in a range of 11 nm-15 nm. Lattice parameter calculations are reduced due to its substitution which leads to the exchange of large ionic radius of Fe3+ for small ionic radius of Bi3+. The x-ray density is analyzed to increase with doping. Fourier transform infrared spectroscopy (FTIR) is performed to analyze absorption band spectra. The two absorption bands are observed in a range of 400 cm-1-600 cm-1, and they are the characteristic feature of spinel structure. Thermo-gravimetric analysis (TGA) reveals the total weight loss of nearly 1.98%. Dielectric analysis is carried out by impedance analyzer in a frequency span from 1 MHz to 3 GHz by using the Maxwell Wagner model. Dielectric studies reveal the decrease of dielectric parameters. The alternating current (AC) conductivity exhibits a plane behavior in a low frequency range and it increases with the applied frequency increasing. This is attributed to the grain effects in a high frequency range or may be due to the reduction of porosity. Real and imaginary part of impedance show the decreasing trend which corresponds to the grain boundary action. The imaginary modulus shows the occurrence of peak that helps to understand the interfacial polarization. Cole-Cole graph shows a single semicircle which confirms that the conduction mechanism is due to the grain boundaries at low frequency. Dielectric studies reveal the applicability of these ferrites in high frequency equipment, microwave applications, high storage media, and semiconductor devices.

关键词: Co-ferrite, nanocrystalline ferrites, XRD, microemulsion, dielectric properties

Abstract: Spinel ferrites have a significant role in high-tech applications. In the present work nano-crystalline ferrites having general formula Co0.5Cd0.5BixFe2-xO4 with (x=0.0, 0.05, 0.1, 0.15, 0.2, and 0.25) are synthesized via micro-emulsion route. Powder x-ray diffraction (XRD) studies discover the FCC spinel structure. Crystalline size is calculated in a range of 11 nm-15 nm. Lattice parameter calculations are reduced due to its substitution which leads to the exchange of large ionic radius of Fe3+ for small ionic radius of Bi3+. The x-ray density is analyzed to increase with doping. Fourier transform infrared spectroscopy (FTIR) is performed to analyze absorption band spectra. The two absorption bands are observed in a range of 400 cm-1-600 cm-1, and they are the characteristic feature of spinel structure. Thermo-gravimetric analysis (TGA) reveals the total weight loss of nearly 1.98%. Dielectric analysis is carried out by impedance analyzer in a frequency span from 1 MHz to 3 GHz by using the Maxwell Wagner model. Dielectric studies reveal the decrease of dielectric parameters. The alternating current (AC) conductivity exhibits a plane behavior in a low frequency range and it increases with the applied frequency increasing. This is attributed to the grain effects in a high frequency range or may be due to the reduction of porosity. Real and imaginary part of impedance show the decreasing trend which corresponds to the grain boundary action. The imaginary modulus shows the occurrence of peak that helps to understand the interfacial polarization. Cole-Cole graph shows a single semicircle which confirms that the conduction mechanism is due to the grain boundaries at low frequency. Dielectric studies reveal the applicability of these ferrites in high frequency equipment, microwave applications, high storage media, and semiconductor devices.

Key words: Co-ferrite, nanocrystalline ferrites, XRD, microemulsion, dielectric properties

中图分类号:  (Dielectric properties)

  • 87.19.rf
72.20.-i (Conductivity phenomena in semiconductors and insulators) 77.84.-s (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials) 47.54.Jk (Materials science applications)