Preparation method of perovskite LnCrO3 and LnAlO3 nanomaterials

[0021] Example 1: Combine gadolinium nitrate, chromium nitrate, ethylene glycol and HNO 3 Mix according to the stoichiometric ratio of 1:1:1000:100, while continuously stirring for half an hour to make the components evenly mixed. The obtained mixed solution was transferred to a static reactor, reacted at 180° C. for 5 hours, and then naturally cooled to room temperature. The obtained reactant was centrifuged at 1000 rpm for 10 min, the upper solution was discarded, and the lower solid was washed and dried to obtain a gray-black precursor. Scanning electron micrograph ( figure 1 ) It is confirmed that the obtained precursor is spherical nanoparticles of uniform size, and the obtained precursor is calcined at 700°C for 2h to obtain green nano-level GdCrO 3 Powder (scanning electron micrograph figure 2 Shown). XRD analysis confirmed the formation of GdCrO with perovskite structure 3 (The XRD spectrum is as image 3 Shown).

[0022] Example 2: Combine lanthanum nitrate, chromium nitrate, ethylene glycol, HNO 3 Mix according to the stoichiometric ratio of 1:1:100:10, while continuously stirring for half an hour to make the components evenly mixed, transfer the resulting solution to a static reactor, and react at 150°C for 12 hours to obtain reactants. Centrifugal separation at 1000 rpm for 10 min, the lower solid was washed and dried to obtain a gray-black precursor, and the precursor was calcined at 700°C for 5 hours to obtain green nano-level LaCrO 3 powder. XRD analysis confirmed the formation of LaCrO with perovskite structure 3 (The XRD spectrum is as Figure 4 Shown).

[0023] Example 3: Combine yttrium nitrate, chromium nitrate, ethylene glycol, HNO 3 Mix uniformly according to the stoichiometric ratio of 1:1:10000:100. The resulting mixed solution was transferred to a static reactor and reacted at 200°C for 5 hours to obtain a reactant. The reactant was centrifuged at 1000 rpm for 10 minutes, and the lower solid was washed and dried to obtain a gray-black precursor. The precursor is calcined for 2h to obtain green nano-level YCrO 3 powder. XRD analysis confirmed the formation of YCrO with perovskite structure 3 (The XRD spectrum is as Figure 5 Shown).