NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2020, 11 (6), P. 698–704
Sol-gel synthesis and the investigation of the properties of nanocrystalline holmium orthoferrite
A. T. Nguyen – Ho Chi Minh City University of Education, Ho Chi Minh City 700000, Vietnam; tienna@hcmue.edu.vn
H. L. T. Tran – Ho Chi Minh City University of Education, Ho Chi Minh City 700000, Vietnam; tran.hongle86@gmail.com
Ph. U. T. Nguyen – Ho Chi Minh City University of Education, Ho Chi Minh City 700000, Vietnam; nguyenphuonguyen0110@gmail.com
I.Ya. Mittova – Voronezh State University, Universitetskaya pl. 1, Voronezh, 394018, Russia; imittova@mail.ru
V. O. Mittova – Burdenko Voronezh State Medical University, Voronezh, 394036, Russia; vmittova@mail.ru
E. L. Viryutina – Voronezh State University, Universitetskaya pl. 1, Voronezh, 394018, Russia; viryutina.helena@yandex.ru
V. H. Nguyen – Dong Thap University, Cao Lanh City 81000, Vietnam; nguyenvanhung@dthu.edu.vn
X.V. Bui – Sai Gon University, Ho Chi Minh City, 700000, Vietnam; buixuanvuongsgu@gmail.com
T. L. Nguyen – Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Vietnam; Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang, 550000, Vietnam; nguyentuanloi@duytan.edu.vn
Holmium orthoferrite nanocrystals (HoFeO3) were synthesized from an aqueous solution by the sol-gel method, using polyvinyl alcohol as a stabilizer and annealing at temperatures of 650, 750, and 850 °C for an hour. According to the results of the performed analyses, it was found that with an increase in the annealing temperature, the average size of HoFeO3 crystallites increases from 24 to 30 nm. The magnetic characteristics of the samples were measured and it was shown that holmium orthoferrite is a paramagnet with a low coercive force. The band gap of nanocrystalline holmium ferrite is determined.
Keywords: nanoparticles, holmium orthoferrite, sol-gel technique, magnetic properties, optical properties.
DOI 10.17586/2220-8054-2020-11-6-698-704
