Structural, morphological, optical, dielectric and magnetic field sensing characteristics of Bi1-xKxMnO3 and BiMn1-yCoyO3 nanopowders: A comparative study

• Published in: Materials letters 2019-12, Vol.256, p.126655, Article 126655
• Main Authors: Revathi, B., Balakrishnan, L., Chandar, N. Krishna
• Format: Article
• Language: English
• Subjects: Co doped BiMnO3; Comparative studies; Dielectrics; Electron microscopes; Fiber optic sensor; Fiber optics; K doped BiMnO3; Magnetic field sensor; Magnetic fields; Materials science; Morphology; Nanocrystalline materials; Optical fibers; Room temperature; Sensitivity analysis
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2019.126655

•BiMnO3 (BMO) and its composites, Bi1-xKxMnO3 and BiMn1-yCoyO3 (x = y = 0.05, 1.0, 1.5) were synthesized.•Structural, morphological, optical, dielectric and magnetic filed sensing characteristics were investigated.•Fiber optic magnetic filed sensor has been designed by using synthesized material as sensing medium.•Bi0.95K0.05MnO3 shows the better sensitivity compared with the other compositions. Composites of BiMnO3 such as Bi1-xKxMnO3 and BiMn1-yCoyO3 (x = y = 0.05, 1.0, 1.5) based fiber optic magnetic field sensors were fabricated and sensitivity analysis was performed at room temperature. The properties of nanosized particles synthesized using hydrothermal method were studied using X-ray diffraction, scanning electron microscope, ultraviolet–visible spectrometer and Dielectric measurement. The results reveal the formation of nanocrystallite of size ∼ 50 nm with rice like morphology in the bandgap range between 1.2 eV and 1.5 eV. The 5% K doped BMO has better magnetic field sensitivity at a source wavelength of 693 nm and pristine BMO has better sensitivity at 772 nm.