1：Experimental Design and Method Selection:

Hydrothermal synthesis method was used to prepare Nd-Fe3O4 nanoparticles with varying mole ratios of Nd (1%, 2%, 5%, 10%) to investigate structural changes.

2：Sample Selection and Data Sources:

Samples were synthesized from precursor materials including NdCl3·6H2O and FeCl3·6H2O, with characterization using XRD, FTIR, EDS, and TEM.

3：List of Experimental Equipment and Materials:

Materials: NdCl3·6H2O, FeCl3·6H2O, (CH2OH)2, CH3COONa, HO(CH2CH2O)nH, CH3CH2OH, purified water. Equipment: Electronic Analytical Balance (YP6102), Magnetic Stirrer (HJ-3), Reaction kettle (KH-100), Ultrasonic cleaning machine (DK-410HT), Drying oven (101-1B), Centrifuge (TGL-50), TEM (CM30), XRD (D8 Advance), FTIR (vector22).

4：2). Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Dissolve precursors in (CH2OH)2, add CH3COONa and HO(CH2CH2O)nH, stir for 30 minutes, ultrasonic treatment for 60 minutes at 280 W, transfer to reaction kettles, bake at 200°C for 12 hours, cool, rinse with water and ethanol, dry at 60°C for 6 hours.

5：Data Analysis Methods:

XRD for phase composition, FTIR for chemical bonds, EDS for elemental composition, TEM for morphology and size.