Magnetic Disorder in the Frustrated Antiferromagnet Jarosite Arising from the H 3 O + ···OH - Interaction

作者：Daniel Grohol, Daniel G. Nocera · 发表于：Chemistry of Materials · 年份：2007 · DOI：10.1021/cm062793f · 被引用次数：26 · 研究领域：Advanced Condensed Matter Physics、Crystal Structures and Properties、Geological and Geochemical Analysis

Iron jarosite solid solutions with varying K + /H 3 O + ratios have been prepared and their magnetic properties investigated. The jarosite samples, with formulas K x (H 3 O) 1- x Fe 3 (OH) 6 (SO 4 ) 2, (0 < x < 1), have been characterized by means of IR spectroscopy, elemental analysis and SQUID magnetic measurements. The ordering temperatures T max of these spin-frustrated antiferromagnets generally decrease with increasing content of interlayer hydronium ions. Magnetic disorder resulting from an interaction between the interlayer hydronium ions and the intralayer Fe 3+ −OH - −Fe 3+ groups appears to be responsible for the decrease in T max values with an increasing hydronium content. The H 3 O + ···OH - interaction appears to exercise a more significant impact on the magnetic disorder in jarosites than the extent occupancy of the magnetic Fe 3+ ions.