Abstract Pure-phased orthorhombic RMn 0.5 Fe 0.5 O 3 (R = Tb, Dy, and Ho) were successfully synthesized via the low-temperature hydrothermal technique. The nucleation and crystal growth of RMn 0.5 Fe 0.5 O 3 (R = Tb, Dy, and Ho) were influenced mainly by medium alkalinity, reaction temperature and time. All the three samples are of orthorhombic structure with +3 valences of Mn and Fe. They present morphologies of spheres that are assembled by smaller tabular crystals. Spin reorientation transitions were observed in RMn 0.5 Fe 0.5 O 3 (R = Tb, Dy, and Ho), and magnetization reversal was observed in TbFe 0.5 Mn 0.5 O 3 . The spin reorientation temperatures show a linear relation with the magnetic field intensity, and the spin reorientation and magnetization reversal disappear when the applied field is big enough. Antiferromagnetic transition of R 3+ was observed in TbFe 0.5 Mn 0.5 O 3 and DyFe 0.5 Mn 0.5 O 3 at lower temperatures. All the three samples show the characteristics of spiral magnetic ordering at 2 K and show residual magnetism at both 2 K and 300 K.

中文翻译：

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多铁性 RMn 0.5 Fe 0.5 O 3 (R=Tb、Dy 和 Ho) 的水热合成和磁性

摘要 采用低温水热技术成功合成了纯相正交晶系RMn 0.5 Fe 0.5 O 3 (R = Tb、Dy和Ho)。RMn 0.5 Fe 0.5 O 3 (R = Tb、Dy和Ho)的成核和晶体生长主要受中等碱度、反应温度和时间的影响。所有三个样品都是斜方晶结构，具有+3价的Mn和Fe。它们呈现出由较小的板状晶体组装而成的球体形态。在 RMn 0.5 Fe 0.5 O 3 (R = Tb、Dy 和 Ho) 中观察到自旋重定向转变，在 TbFe 0.5 Mn 0.5 O 3 中观察到磁化反转。自旋重定向温度与磁场强度呈线性关系，当外加场足够大时，自旋重定向和磁化反转消失。在较低温度下，在 TbFe 0.5 Mn 0.5 O 3 和 DyFe 0.5 Mn 0.5 O 3 中观察到 R 3+ 的反铁磁转变。三个样品均在 2 K 处表现出螺旋磁有序特性，并在 2 K 和 300 K 处均表现出剩磁。