Magnetic structures and properties of α-CrPO4 and α-CrAsO4

Journal article

The magnetic properties of the isomorphous compounds α-CrPO4 and α-CrAsO4 have been investigated by magnetic susceptibility and low-temperature powder neutron diffraction methods. These materials order antiferromagnetically below 9.1 ± 1.0 and 7.7 ± 0.8 K, respectively, and the magnetic structure of α-CrPO4 at 2 K reveals both ferromagnetic and antiferromagnetic Cr-O-Cr interactions, arising from different linkages of CrO6 octahedra. The magnetic structure of α-CrAsO4 at 5 K differs from that of α-CrPO4 in that the ferromagnetic interactions are frustrated. This is ascribed to the Cr-O-Cr interactions in α-CrAsO4 being weaker than those in α-CrPO4, relative to competing antiferromagnetic interactions through the XO4 group, as the relevant Cr-O bonds are longer in the former structure. © 1989 American Chemical Society.

Authors: Attfield, J; Battle, P; Cheetham, A; Johnson, D

• Journal: Inorganic Chemistry
• Volume: 28
• Issue: 7
• Pages: 1207-1213
• Publication date: 1989-01-01
• ISSN: 0020-1669
• Language: English