Metal-organic magnets with large coercivity and ordering temperatures up to 242{degrees}C
Magnets derived from inorganic materials (e.g., oxides, rare-earth–based, and intermetallic compounds) are key components of modern technological applications. Despite considerable success in a broad range of applications, these inorganic magnets suffer several drawbacks, including energetically expensive fabrication, limited availability of certain constituent elements, high density, and poor scope for chemical tunability. A promising design strategy for next-generation magnets relies on the versatile coordination chemistry of abundant metal ions and inexpensive organic ligands. Following this approach, we report the general, simple, and efficient synthesis of lightweight, molecule-based magnets by postsynthetic reduction of preassembled coordination networks that incorporate chromium metal ions and pyrazine building blocks. The resulting metal-organic ferrimagnets feature critical temperatures up to 242°C and a 7500-oersted room-temperature coercivity.
Source: ScienceNOW - Category: Science Authors: Perlepe, P., Oyarzabal, I., Mailman, A., Yquel, M., Platunov, M., Dovgaliuk, I., Rouzieres, M., Negrier, P., Mondieig, D., Suturina, E. A., Dourges, M.-A., Bonhommeau, S., Musgrave, R. A., Pedersen, K. S., Chernyshov, D., Wilhelm, F., Rogalev, A., Mathoni Tags: Chemistry, Materials Science reports Source Type: news