Weak Ferromagnetism and Framework Switching in KMnHP3O10

✍ Scribed by A.J Wright; C Ruiz-Valero; J.P Attfield

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 165 KB
• Volume: 145
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8167

✦ Synopsis

It adopts a triclinically distorted variant of the RbMnHP 3 O 10 structure and an approximate structure re5nement has been obtained from powder neutron di4raction data (space group P1 , a ‫؍‬ 7.102(2), b ‫؍‬ 7.234(1), c ‫؍‬ 9.109(2) A s , ‫؍‬ 72.176(8), ‫؍‬ 73.762( 9), ‫؍‬ 70.642(12)3 at 2 K). A magnetic ordering transition is observed at 15 K, below which KMnHP 3 O 10 displays weak ferromagnetism with a net moment of &0.3 B per Mn ion showing that the true structural symmetry may be P1. The magnetic structure has an a؋2b؋2c supercell and is more complex than that of the Rb and Cs analogues, due to a switching of the Jahn+Teller distortions of the MnO 6 octahedra.