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J. Korean Ceram. Soc. > Volume 57(4); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(4): 385-391.
doi: https://doi.org/10.1007/s43207-020-00044-x
Effect of boron addition on the phase‑transition temperature of CoPt‑B nanoparticles synthesized by sol–gel autocombustion using sago starch as a chelating agent
Prawit Nuengmatcha1 , Amnuay Noypha2, Witoon Tangwatanakul3, Thanida Charoensuk4, Paweena Porrawatkul1, Saksit Chanthai5
1Nanomaterials Chemistry Research Unit, Department of Chemistry, Faculty of Science and Technology, Nakhon Si Thammarat Rajabhat University, Nakhon Si Thammarat 80280, Thailand
2Department of Physic, Faculty of Education, Nakhon Si Thammarat Rajabhat University, Nakhon Si Thammarat 80280, Thailand
3Academy for the Study of Science, Technology and Language Learning, Surawiwat School, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
4Molecular Technology Research Unit, School of Science, Walailak University, Nakhon Si Thammarat 80160, Thailand
5Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
Correspondence  Prawit Nuengmatcha ,Email: pnuengmatcha@gmail.com
Received: February 20, 2020; Revised: March 21, 2020   Accepted: March 27, 2020.  Published online: April 30, 2020.
ABSTRACT
In this research, we reported the effect of boron addition on the phase-transition temperature of CoPt-B nanoparticles using a sol–gel autocombustion method. Sago starch was used as a chelating agent. From the results, the suitable values of the sago starch concentration, boron concentration, and annealing temperature were determined to be 10% (w/v), 0.20 mol/L, and 500 °C, respectively. All the synthesized samples were characterized by the SEM, TEM, EDS, XRD, and VSM techniques. The XRD patterns of the synthesized CoPt-B nanoparticles demonstrated that the phase-transition temperature of CoPt-B changes from the disordered A1 phase to the ordered L10 phase at 500 °C. It can be concluded that the addition of boron could reduce about 100 °C of the ordering temperature of CoPt-B. Moreover, the VSM data confirmed that the obtained samples exhibited their ferromagnetism properties, indicating that the synthesized CoPt-B nanoparticles can be applied as ultrahigh-density magnetic recording media.
Key words: CoPt-B nanoparticles · Boron · Sol–gel · Sago starch
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