A bifeo3 thin film with high remnant polarization intensity co-doped with b-site mn and ni and its preparation method
A polarization intensity, high residual technology, applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., can solve the problem that ferroelectricity cannot be measured correctly in saturation polarization, it is difficult to observe hysteresis loops, and low dielectric Constants and other problems, to achieve the effect of easy chemical composition of the film, solve the price change of Fe, and improve the performance of multiferroics
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Embodiment 1
[0024] 1) Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, C 4 h 6 MnO 4 4H 2 O and C 4 h 6 NiO 4 4H 2 O is dissolved in the mixed solution formed by mixing ethylene glycol methyl ether and acetic anhydride at a molar ratio of 1.05:0.95:0.04:0.01, and then stirred for 2 hours to make it uniform to obtain BiFeO 3 Precursor; Among them, BiFeO 3 The total metal ion concentration in the precursor solution is 0.3mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride in the mixed solution is 3:1;
[0025] 2) BiFeO 3 The precursor solution was left to stand for 24h, and then spin-coated BiFeO on the FTO / glass substrate 3 The wet film was prepared from the precursor solution, and the wet film was baked at 200°C for 5 minutes to obtain a dry film, and then rapidly annealed at 550°C for 15 minutes to obtain crystalline BiFeO 3 film;
[0026] 3) To be crystalline BiFeO 3 After film cooling, repeat step 2) again until crystalline BiFeO 3 The film reach...
Embodiment 2
[0032] 1) Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, C 4 h 6 MnO 4 4H 2 O and C 4 h 6 NiO 4 4H 2 O is dissolved in the mixed solution formed by mixing ethylene glycol methyl ether and acetic anhydride at a molar ratio of 1.05:0.94:0.04:0.02, and then stirred for 2 hours to make it uniform to obtain BiFeO 3 Precursor; Among them, BiFeO 3 The total metal ion concentration in the precursor solution is 0.3mol / L, x=0.02;
[0033] 2) BiFeO 3 The precursor solution was left to stand for 32h, and then spin-coated BiFeO on the FTO / glass substrate 3 The wet film was prepared from the precursor solution, and the wet film was baked at 200°C for 10 minutes to obtain a dry film, and then rapidly annealed at 550°C for 10 minutes to obtain crystalline BiFeO 3 film.
[0034] 3) To be crystalline BiFeO 3 After film cooling, repeat step 2) again until crystalline BiFeO 3 The film reaches the required thickness, that is, the B-site Mn and Ni co-doped BiFeO with high remanent pola...
Embodiment 3
[0036] 1) Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, C 4 h 6 MnO 4 4H 2 O and C 4 h 6 NiO 4 4H 2 O is dissolved in the mixed solution formed by mixing ethylene glycol methyl ether and acetic anhydride at a molar ratio of 1.05:0.93:0.04:0.03, and then stirred for 2 hours to make it uniform to obtain BiFeO 3 Precursor; Among them, BiFeO 3 The total metal ion concentration in the precursor solution is 0.3mol / L; the volume ratio of ethylene glycol methyl ether and acetic anhydride in the mixed solution is 3:1;
[0037] 2) BiFeO 3 The precursor solution was left to stand for 28h, and then spin-coated BiFeO on the FTO / glass substrate 3 The wet film was prepared from the precursor solution, and the wet film was baked at 200°C for 7 minutes to obtain a dry film, and then rapidly annealed at 550°C for 13 minutes to obtain crystalline BiFeO 3 film.
[0038] 3) To be crystalline BiFeO 3 After film cooling, repeat step 2) again until crystalline BiFeO 3 The film reaches t...
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