Crystal Structure, Magnetic, and Mössbauer Studies of Cu6Fe0.9V6O19: A Compound with Relaxation Effect

✍ Scribed by L. Permer; Y. Laligant; G. Ferey; Y. Calage

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 294 KB
• Volume: 107
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1379

✦ Synopsis

(\mathrm{Cu}{6} \mathrm{Fe}{0.9} \mathrm{~V}{6} \mathrm{O}{19}), grown by hydrothermal synthesis, crystallizes in the rhombohedral system, space group (R \overline{3}), with (a=12.9399(8) \AA, c=7.1275(3) \AA(T=293 \mathrm{~K})), and (Z=3). The structure is related to that of so-called (\alpha)-copper vanadate, (\mathrm{Cu}{6.3} \mathrm{~V}{6} \mathrm{O}{18.78}). Magnetic and Mössbauer studies were performed in order to characterize the physical properties of (\mathrm{Cu}{6} \mathrm{Fe}{0.9} \mathrm{~V}{6} \mathrm{O}_{19}). The onset of magnetic ordering occurs close to (10 \mathrm{~K}) and the iron in the trivalent state shows some relaxation effects. 1993 Academic Press, Inc.