用水热法合成掺杂Pr^(3+)的NiPr_xFe_(2-x)O_4纳米颗粒及其表征

Hydrothermal synthesis of praseodymium-doped NiPr_xFe_(2-x)O_4 nanoparticles and its characterization

采用水热法制备了掺杂Pr3+的NiPrx Fe2-x O4(x=0.0,0.01,0.025,0.05,0.075,0.1,0.15)纳米颗粒.实验结果表明制备的样品是立方体结构的纳米颗粒,当掺杂量为0<x≤0.1时Pr3+能成功掺杂到NiFe2O4尖晶石晶格内,但掺杂量x>0.1(x=0.15)时会出现杂峰.随着掺杂量从0增加到0.1,样品的平均晶粒尺寸从47nm减小到18nm,饱和磁化强度从55A·m2/kg单调减小至37A·m2/kg,矫顽力从4.7×103 A/m减小到3.4×103 A/m.饱和磁化强度减少的原因主要是由于室温下无磁性的Pr3+代替NiFe2O4中的Fe3+造成的.

Rare earth element praseodymium-doped NiPrxFe2-xO4 （r=0.0, 0.01, 0. 025, 0.05, 0. 075, 0.1,0.15） magnetic nanoparticles were successfully synthesized using hydrothermal method. Experimental results showed that the prepared samples were cubic structural nanoparticles. When 0〈r≤0.1, Pr3＋ ions could be successfully doped into the nickel ferrite spinel lattice; when .r〉0.1 （.r=0.15）, impurity peak occurred. With the increasing of doping level from 0 to 0. 1, the average crystallite size decreased from 47 nm to 18 nm, saturation magnetization monotone reduced from 55 A · m2/kg to 37 A · m2/kg and coercivity decreased from 4.7×10^3 A/m to 3.4×10^3 A/re.