Phase behaviors and magnetic properties of magnetic ionic liquids (mILs) were investigated at low temperature. The mILs were [C₄mim][FeCl₄], [C₄mim][FeCl₃Br], [C₄mim][FeCl₂Br₂], [C₄mim][FeClBr₃], and [C₄mim] [FeBr₄], where [C₄mim]⁺ is 1-butyl-3-methylimidazolium. The formation of symmetric and asymmetric anions was identified using Raman spectroscopy. In addition, [C₄mim][FeCl₄], [C₄mim][FeCl₃Br], and [C₄mim][FeCl₂Br₂] indicated a paramagnetic behavior of magnetic susceptibility, which obeyed the Curie-Weiss law. In [FeClBr₃]^--, and [FeBr₄]^--based mILs, crystallization was induced at a low temperature upon cooling. Moreover, nonparamagnetic magnetic susceptibility was observed in [C₄mim][FeClBr₃], and [C₄mim][FeBr₄].

在低温下研究了磁性离子液体（mIL）的相行为和磁性。mIL为[C ₄ mim] [FeCl ₄ ]，[C ₄ mim] [FeCl ₃ Br]，[C ₄ mim] [FeCl ₂ Br ₂ ]，[C ₄ mim] [FeClBr ₃ ]和[C ₄ mim] [FeBr ₄ ]，其中[C ₄ mim] ⁺为1-丁基-3-甲基咪唑鎓。使用拉曼光谱法鉴定对称和不对称阴离子的形成。另外，[C ₄ mim] [FeCl ₄ ]，[C ₄ mim] [FeCl ₃Br]和[C ₄ mim] [FeCl ₂ Br ₂ ]表示磁化率的顺磁性行为，服从居里-魏斯定律。在[FeClBr ₃ ] ^-和[FeBr ₄ ] ^-基的mIL中，冷却后在低温下诱导结晶。此外，在[C ₄ mim] [FeClBr ₃ ]和[C ₄ mim] [FeBr ₄ ]中观察到非顺磁磁化率。