Heat capacity of a five-coordinated iron(III) complex, chlorobis(N, N-dimethyldithiocarbamato) iron(III), between 0.4 and 300 k: New finding of a magnetic phase transition
作者:Masanori Yoshikawa、Michio Sorai、Hiroshi Suga
DOI:10.1016/0022-3697(84)90072-6
日期:1984.1
Abstract The heat capacity of bromobis( N , N -dimethyldithiocarbamato)iron(III) was measured between 0.4 and 300 K. A phase transition from a ferromagnetic to a paramagnetic state was found at T c = (0.837 ± 0.005) K, and a Schottky anomaly arising from the zero-field splitting was observed around 9 K. The total magnetic entropy and enthalpy, including the phase transition and the Schottky anomaly
摘要 在 0.4 和 300 K 之间测量了溴双 (N , N - 二甲基二硫代氨基甲酸) 铁 (III) 的热容量。在 T c = (0.837 ± 0.005) K 处发现了从铁磁态到顺磁态的相变,并且 a在 9 K 附近观察到由零场分裂引起的肖特基异常。 总磁熵和磁焓,包括相变和肖特基异常,为 (11.74 ± 0.01) JK -1 mol -1 和 (92.0 ± 0.4) J mol -1 ,分别。熵仅比 R ln 4 (= 11.53 JK -1 mol -1 ) 大 1.8%,证实自旋流形确实是四重奏(中间自旋 S = 3 2 )。跃迁熵和焓分别估计为(6.05±0.01)JK -1 mol -1 和(5.77±0.01)J mol -1 。跃迁熵仅比 R ln 2 大 5%。由于本化合物的基自旋态的特征是 S = 3 2 态零场分裂成两个克莱默双峰,相变只与基克拉默双峰有关。与乙基同系物相比,T