Abstract
Differential thermal analysis, X-ray diffractometry and scanning electron microscopy with energy dispersive spectroscopy were used to study the crystallisation of glass ribbons with a composition of 35% BaO, 35%Fe 2O 3, 20%B 2O 3 and 10% SiO 2 (mol%) prepared via cooling the melts between steel rollers. The magnetic properties of specimens were also measured with a vibrating sample magnetometer. Heat treatment of glass specimens both in the form of bulk (ribbon) or pressed powders at their respective DTA exo-peak temperatures of 722 and 702 °C led to the formation of BaFe 12O 19 and BaB 2O 4 as the only crystalline phases. The pressed powders showed the finest and the broadest size distribution of acicular and platelet particles in the 0.1–2.5 μm range. The glass ribbons heat treated in one-stage exhibited the most uniform distribution of platelet particles of 0.9 μm mean size, while a two-stage heat treatment led to a bimodal size distribution of platelet particles. All specimens showed nearly identical values of saturation magnetisation of M s = 25–27 emu/g while the coercivity values varied between H c = 2800–3800 Oe.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
