A kind of preparation method of rod-shaped spinel type ferrite
A spinel type, ferrite technology, applied in chemical instruments and methods, iron compounds, nanotechnology for materials and surface science, etc., can solve the problems of large influence of precipitation conditions, stratification, etc., to achieve process Stable, easy to prepare, low requirement for reaction equipment
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Embodiment 1
[0025] Weigh nickel nitrate and acicular α-FeOOH respectively according to nickel nitrate: α-FeOOH=3:2 (molar ratio); ultrasonically disperse α-FeOOH in water for 0.5 hours; make nickel nitrate into a 3mol / L aqueous solution, and use Adjust the pH=8 with ammonia water; add the dispersed α-FeOOH into the pH-adjusted nickel nitrate solution, stir and evaporate at room temperature for 8 hours, then dry at 80°C and grind to obtain NiFe 2 o 4 Precursor. The precursor was kept at 350°C for 2 hours, and then calcined at 900°C for 2 hours to obtain the calcined product NiFe 2 o 4 .
[0026] attached figure 1 is the SEM image of the precursor, which shows that the precursor is in a distinct one-dimensional rod shape. attached figure 2 , attached image 3 And attached Figure 4 XRD diagram, SEM diagram and hysteresis loop diagram of the product. They indicate that the obtained products are nano-NiFe with pure phase and rod-like morphology. 2 o 4 , the particle length is 200n...
Embodiment 2
[0030] Prepare the nano-NiFe of rod shape by the step of embodiment 1 2 o4 , the difference is: the carbonyl polycrystalline iron fiber is used as a template to replace α-FeOOH, the molar ratio of nickel nitrate to carbonyl polycrystalline iron fiber is 1.2:1, and pH=9.
[0031] attached Figure 5 , attached Figure 6 And attached Figure 7 It is the XRD pattern, SEM pattern and hysteresis loop diagram of the final product. They indicate that the obtained products are nano-NiFe with pure phase and rod-like morphology. 2 o 4 , the longest particle size can reach 9μm. The resulting NiFe 2 o 4 The Ms is 37.28emu / g, and the Hc is 167.55Oe.
[0032] This example illustrates that one-dimensional rod-shaped nano-spinel ferrite can also be prepared by using different templates. Compared with Example 1, this example also illustrates that the rod-shaped particle size and performance of the prepared spinel ferrite can be adjusted by adjusting the template type and / or other synth...
Embodiment 3
[0034] According to the steps of Example 1, according to the metal element Zn:Fe=1.8:2 (molar ratio), weigh a certain amount of zinc nitrate and α-FeOOH, adjust the pH=8~9 with ammonia water, and then add α-FeOOH.
[0035] attached Figure 8 And attached Figure 9 XRD and SEM images of the final product. They indicate that the obtained products are nano-ZnFe with pure phase and rod-like morphology. 2 o 4 , its particle length can reach 0.6~1.8μm, and its aspect ratio is 2~14.
[0036] Compared with Example 1, this example illustrates that spinel ferrites with different chemical compositions can be prepared through the technology of the present invention, and also illustrates that by adjusting the type of metal salt and / or other synthesis conditions, the prepared spinel can be adjusted Rod particle size and properties of stone ferrites.
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