在20~80 ℃温度范围内，研究了两种浓度的铁氧体(主要成分为Fe3O4)磁流体在一系列固定磁场强度(场强范围为0~200 mT)下的双折射与温度的关系.结果表明不同浓度磁流体的双折射具有类似的磁场和温度依赖性.固定磁场强度时，磁流体的双折射值与温度成反比；而温度恒定时，磁流体的双折射值与外磁场的强度成正比；在相同磁场强度、恒定温度下，高浓度磁流体的双折射值比低浓度磁流体的大.详细分析了实验结果，并深入讨论了磁流体双折射的温度、场强和浓度依赖性的物理机理.

The relationship between the birefringence of Fe3O4 magnetic fluids and the ambient temperature (in the range of 20~80 ℃) at several different magnetic field strengths (lies in 0~200 mT) are investigated. The results show that similar dependence of birefringence on magnetic field strength and temperature happens for magnetic fluids with different concentrations. Moreover, the birefringence of the magnetic fluid is inversely proportional to the ambient temperature at fixed magnetic strength and proportional to the magnetic field strength at fixed ambient temperature. In a given temperature and magnetic field strength, the birefringence of the magnetic fluid with high concentration is larger than that with low concentration. The phenomena and results are analyzed carefully and the physical mechanism is clarified in detail.