Synthesis, Crystal Structure, and Magnetic Susceptibilities of CsFeP2O7 and RbFeP2O7

✍ Scribed by Edita Dvoncova; Kwang-Hwa Lii

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 287 KB
• Volume: 105
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1216

✦ Synopsis

Two new ternary iron(III) diphosphates, (\mathrm{CsFeP}{2} \mathrm{O}{7}) and (\mathrm{RbFeP}{2} \mathrm{O}{7}), have been prepared and the structure of the Cs compound was determined from single-crystal (X)-ray diffraction data. Base on powder (X)-ray diffraction (\mathrm{RbFeP}{2} \mathrm{O}{7}) adopts the same structure type as that of the (\mathrm{Cs}) compound. (\mathrm{CsFeP}{2} \mathrm{O}{7}) crystallizes in the monoclinic space group (P 2_{1} / c) with (a=7.684(3), b=9.937(3), c=8.378(3) \AA, \beta=104.84(3)^{\circ}), (V=618.4(4) \AA^{3}, Z=4), and (R=0.048). The structure consists of intersecting tunnels running along the [001] and [110] directions, and the (\mathrm{Cs}^{+})cations are located at the intersection of these tunnels. The framework is built up from corner-sharing (\mathrm{FeO}{6}) octahedra and (\mathrm{P}{2} \mathrm{O}{7}) groups. (\mathrm{CsFeP}{2} \mathrm{O}{7}) is isostructural with (\mathrm{KFeP}{2} \mathrm{O}{7}). Variable-temperature powder magnetic susceptibility data exhibit an antiferromagnetic transition at (T{\mathrm{N}} \sim 25 \mathrm{~K}). 1993 Academic Press, Inc.