UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore-452017, India.
J Phys Condens Matter. 2010 Apr 14;22(14):146005. doi: 10.1088/0953-8984/22/14/146005. Epub 2010 Mar 23.
The magnetic and phonon properties of polycrystalline magnetoelectric/multiferroic GaFeO(3) are studied. Using high field (57)Fe Mossbauer spectroscopy, occupation of Fe is observed at four cation sites. A Fe population of about 6% is observed at the tetrahedral Ga1 site, which explains the observed pinched-like M-H curve and initial sharp increase of the magnetization. The calculated net magnetization value from Mossbauer data suggests that the Fe moment at the Ga1 site is parallel to Fe1 and opposite to that of Fe2 and Ga2 sites, resulting in ferrimagnetism. From low temperature Raman data, anomalous temperature variation in frequency at T(C) is observed for the mode at ∼700 cm(-1).
多晶铁电/多铁性 GaFeO(3) 的磁性和声子性质研究。利用高磁场 (57)Fe 穆斯堡尔谱，观察到 Fe 占据四个阳离子位。在四面体 Ga1 位观察到约 6%的 Fe 占据，这解释了观察到的类似捏合的 M-H 曲线和磁化强度的初始急剧增加。从穆斯堡尔数据计算的净磁化值表明，Ga1 位的 Fe 磁矩与 Fe1 平行，与 Fe2 和 Ga2 位相反，导致反铁磁性。从低温拉曼数据中，在 T(C)处观察到约 700 cm(-1)处的模式的频率出现异常的温度变化。
