Hong Young Chang
Assistant Professor
United StatesResearch Interests
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About
Dr. Hong Young Chang is an Assistant Professor at Sul Ross State University in the United States. His research focuses on the structural analysis and characterization of various metal fluorides and oxides, as highlighted in his recent articles on barium manganese fluorides and mixed metal fluoride hydrates. Dr. Chang employs first-principles calculations to deepen the understanding of these materials.
Articles (3)
Year:
2025
Three new mixed metal fluoride hydrates, M2+AlF5(H2O)7 (M2+ = Fe2+, Co2+, or Ni2+), were synthesized and characterized. The crystals of M2+AlF5(H2O)7 were obtained using a hydrothermal method with a CF3COOH aqueous solution. The crystal structures displayed polymorphisms in C2/m (No. 12) or P-1 (No. 2) space groups, depending on temperature variations. The observed polymorphisms in M2+AlF5(H2O)7 are associated with changes in the bonding environment of [M(H2O)6]2+ and [AlF5(H2O)]2− octahedra, along with changes in hydrogen bonds and unit cell volumes. Infrared spectra and thermogravimetric analyses confirmed the presence of water molecules. The ultraviolet–visible spectra of M2+AlF5(H2O)7 revealed distinctive absorption bands dependent on the [M(H2O)6]2+ complex. This work provides a detailed account of the synthetic procedure, crystal structures, and spectroscopic characterization of M2+AlF5(H2O)7.
Year:
2024
Year:
2023
Collaborators (2)
Kang Min Ok
Professor
Sogang University
Sun Woo Kim
Chosun University
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